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540 lines
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<title>Measurement of Piezoelectric Amplifiers</title>
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<a accesskey="h" href="../index.html"> UP </a>
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<a accesskey="H" href="../index.html"> HOME </a>
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</div><div id="content">
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<h1 class="title">Measurement of Piezoelectric Amplifiers</h1>
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<div id="table-of-contents">
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<h2>Table of Contents</h2>
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<div id="text-table-of-contents">
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<ul>
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<li><a href="#org2765a72">1. Effect of a change of capacitance</a>
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<ul>
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<li><a href="#org0c5b019">1.1. Cedrat Technology</a></li>
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<li><a href="#org452991d">1.2. PI</a></li>
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</ul>
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</li>
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<li><a href="#org872b871">2. Effect of a change in Voltage level</a>
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<ul>
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<li><a href="#org99ab8fd">2.1. Cedrat Technology</a></li>
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<li><a href="#org134abf4">2.2. PI</a></li>
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</ul>
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</li>
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<li><a href="#orgd766270">3. Comparison PI / Cedrat</a>
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<ul>
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<li><a href="#orgbec8ff4">3.1. Results</a></li>
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</ul>
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</li>
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<li><a href="#org2f91855">4. Impedance Measurement</a>
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<ul>
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<li><a href="#orgebadc67">4.1. Cedrat Technology</a>
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<ul>
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<li><a href="#org947e6a7">4.1.1. Compute Impedance</a></li>
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<li><a href="#org876a45b">4.1.2. Effect of Impedance on the phase drop</a></li>
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</ul>
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</li>
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<li><a href="#org6c099fc">4.2. PI</a></li>
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</ul>
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</li>
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<li><a href="#org67f8be8">5. Effect of filters configuration on the PI-E505 dynamics</a>
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<ul>
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<li><a href="#orgf08c313">5.1. PI</a></li>
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<li><a href="#orge828488">5.2. Transfer function of the Voltage Amplifier</a></li>
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<li><a href="#orgd44e75c">5.3. With Load</a></li>
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</ul>
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</li>
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</ul>
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</div>
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</div>
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<div class="note" id="org49fbae4">
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<p>
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The following two voltage amplifiers are tested:
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</p>
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<ul class="org-ul">
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<li>PI E-505.00 (<a href="doc/E-505-Datasheet.pdf">doc</a>)</li>
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<li>Cedrat Technology LA75B (<a href="doc/LA75B.pdf">doc</a>)</li>
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</ul>
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<p>
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The piezoelectric actuator under test is an APA95ML from Cedrat technology (<a href="doc/APA95ML.pdf">doc</a>).
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It contains three stacks with a capacitance of \(5 \mu F\) each that can be connected independently to the amplifier.
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</p>
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</div>
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<p>
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This document is divided into the following sections:
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</p>
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<ul class="org-ul">
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<li>Section <a href="#org23aafd9">1</a>: The effect of a change in load capacitance on the amplifier dynamics is studied</li>
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<li>Section <a href="#org2888e25">2</a>: The effect on the voltage level on the amplifier dynamics is studied</li>
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<li>Section <a href="#org9834afb">3</a>: The dynamics of the E-505 and LA75B are compared</li>
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<li>Section <a href="#org36e302c">4</a>: The output impedance of both amplifiers are measured</li>
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<li>Section <a href="#org846f3ab">5</a>: The effect of the internal filters of the E-505 on its dynamics is studied</li>
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</ul>
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<div id="outline-container-org2765a72" class="outline-2">
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<h2 id="org2765a72"><span class="section-number-2">1</span> Effect of a change of capacitance</h2>
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<div class="outline-text-2" id="text-1">
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<p>
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<a id="org23aafd9"></a>
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</p>
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</div>
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<div id="outline-container-org0c5b019" class="outline-3">
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<h3 id="org0c5b019"><span class="section-number-3">1.1</span> Cedrat Technology</h3>
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<div class="outline-text-3" id="text-1-1">
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<p>
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Load Data
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</p>
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<div class="org-src-container">
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<pre class="src src-matlab">piezo1 = load(<span class="org-string">'cedrat_la75b_med_1_stack.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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piezo2 = load(<span class="org-string">'cedrat_la75b_med_2_stack.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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piezo3 = load(<span class="org-string">'cedrat_la75b_med_3_stack.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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</pre>
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</div>
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<p>
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Compute Coherence and Transfer functions
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</p>
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<div class="org-src-container">
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<pre class="src src-matlab">Ts = 1e<span class="org-type">-</span>4;
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win = hann(ceil(0.1<span class="org-type">/</span>Ts));
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[tf_1, f] = tfestimate(piezo1.V_in, piezo1.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_1, <span class="org-type">~</span>] = mscohere(piezo1.V_in, piezo1.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_2, <span class="org-type">~</span>] = tfestimate(piezo2.V_in, piezo2.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_2, <span class="org-type">~</span>] = mscohere(piezo2.V_in, piezo2.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_3, <span class="org-type">~</span>] = tfestimate(piezo3.V_in, piezo3.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_3, <span class="org-type">~</span>] = mscohere(piezo3.V_in, piezo3.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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</pre>
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</div>
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<p>
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We remove the phase delay due to the time delay of the ADC/DAC:
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</p>
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<div class="org-src-container">
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<pre class="src src-matlab">angle_delay = 180<span class="org-type">/</span><span class="org-constant">pi</span><span class="org-type">*</span>angle(squeeze(freqresp(exp(<span class="org-type">-</span>s<span class="org-type">*</span>Ts), f, <span class="org-string">'Hz'</span>)));
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</pre>
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</div>
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<div id="org89f2a0e" class="figure">
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<p><img src="figs/change_capa_cedrat.png" alt="change_capa_cedrat.png" />
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</p>
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<p><span class="figure-number">Figure 1: </span>Effect of a change of the piezo capacitance on the Amplifier transfer function</p>
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</div>
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</div>
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</div>
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<div id="outline-container-org452991d" class="outline-3">
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<h3 id="org452991d"><span class="section-number-3">1.2</span> PI</h3>
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<div class="outline-text-3" id="text-1-2">
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<div class="org-src-container">
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<pre class="src src-matlab">piezo1 = load(<span class="org-string">'pi_505_high.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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piezo2 = load(<span class="org-string">'pi_505_high_2_stacks.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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piezo3 = load(<span class="org-string">'pi_505_high_3_stacks.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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</pre>
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</div>
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<div class="org-src-container">
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<pre class="src src-matlab">Ts = 1e<span class="org-type">-</span>4;
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win = hann(ceil(0.1<span class="org-type">/</span>Ts));
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[tf_1, f] = tfestimate(piezo1.V_in, piezo1.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_1, <span class="org-type">~</span>] = mscohere(piezo1.V_in, piezo1.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_2, <span class="org-type">~</span>] = tfestimate(piezo2.V_in, piezo2.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_2, <span class="org-type">~</span>] = mscohere(piezo2.V_in, piezo2.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_3, <span class="org-type">~</span>] = tfestimate(piezo3.V_in, piezo3.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_3, <span class="org-type">~</span>] = mscohere(piezo3.V_in, piezo3.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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</pre>
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</div>
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<p>
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We remove the phase delay due to the time delay of the ADC/DAC:
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</p>
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<div class="org-src-container">
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<pre class="src src-matlab">angle_delay = 180<span class="org-type">/</span><span class="org-constant">pi</span><span class="org-type">*</span>angle(squeeze(freqresp(exp(<span class="org-type">-</span>s<span class="org-type">*</span>Ts), f, <span class="org-string">'Hz'</span>)));
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</pre>
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</div>
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<div id="org5607845" class="figure">
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<p><img src="figs/change_capa_pi.png" alt="change_capa_pi.png" />
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</p>
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<p><span class="figure-number">Figure 2: </span>Effect of a change of the piezo capacitance on the Amplifier transfer function</p>
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</div>
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</div>
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</div>
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</div>
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<div id="outline-container-org872b871" class="outline-2">
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<h2 id="org872b871"><span class="section-number-2">2</span> Effect of a change in Voltage level</h2>
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<div class="outline-text-2" id="text-2">
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<p>
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<a id="org2888e25"></a>
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</p>
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</div>
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<div id="outline-container-org99ab8fd" class="outline-3">
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<h3 id="org99ab8fd"><span class="section-number-3">2.1</span> Cedrat Technology</h3>
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<div class="outline-text-3" id="text-2-1">
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<div class="org-src-container">
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<pre class="src src-matlab">hi = load(<span class="org-string">'cedrat_la75b_high_1_stack.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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me = load(<span class="org-string">'cedrat_la75b_med_1_stack.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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lo = load(<span class="org-string">'cedrat_la75b_low_1_stack.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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</pre>
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</div>
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<div class="org-src-container">
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<pre class="src src-matlab">Ts = 1e<span class="org-type">-</span>4;
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win = hann(ceil(0.1<span class="org-type">/</span>Ts));
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[tf_hi, f] = tfestimate(hi.V_in, hi.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_hi, <span class="org-type">~</span>] = mscohere(hi.V_in, hi.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_me, <span class="org-type">~</span>] = tfestimate(me.V_in, me.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_me, <span class="org-type">~</span>] = mscohere(me.V_in, me.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_lo, <span class="org-type">~</span>] = tfestimate(lo.V_in, lo.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_lo, <span class="org-type">~</span>] = mscohere(lo.V_in, lo.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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</pre>
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</div>
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<p>
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We remove the phase delay due to the time delay of the ADC/DAC:
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</p>
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<div class="org-src-container">
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<pre class="src src-matlab">angle_delay = 180<span class="org-type">/</span><span class="org-constant">pi</span><span class="org-type">*</span>angle(squeeze(freqresp(exp(<span class="org-type">-</span>s<span class="org-type">*</span>Ts), f, <span class="org-string">'Hz'</span>)));
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</pre>
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</div>
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<div id="org6cca8d0" class="figure">
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<p><img src="figs/change_level_cedrat.png" alt="change_level_cedrat.png" />
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</p>
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<p><span class="figure-number">Figure 3: </span>Effect of a change of voltage level on the Amplifier transfer function</p>
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</div>
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</div>
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</div>
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<div id="outline-container-org134abf4" class="outline-3">
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<h3 id="org134abf4"><span class="section-number-3">2.2</span> PI</h3>
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<div class="outline-text-3" id="text-2-2">
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<div class="org-src-container">
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<pre class="src src-matlab">hi = load(<span class="org-string">'pi_505_high.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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lo = load(<span class="org-string">'pi_505_low.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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</pre>
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</div>
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<div class="org-src-container">
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<pre class="src src-matlab">Ts = 1e<span class="org-type">-</span>4;
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win = hann(ceil(0.1<span class="org-type">/</span>Ts));
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[tf_hi, f] = tfestimate(hi.V_in, hi.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_hi, <span class="org-type">~</span>] = mscohere(hi.V_in, hi.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_lo, <span class="org-type">~</span>] = tfestimate(lo.V_in, lo.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[co_lo, <span class="org-type">~</span>] = mscohere(lo.V_in, lo.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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</pre>
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</div>
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<div id="orgdd3117a" class="figure">
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<p><img src="figs/change_level_pi.png" alt="change_level_pi.png" />
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</p>
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<p><span class="figure-number">Figure 4: </span>Effect of a change of voltage level on the Amplifier transfer function</p>
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</div>
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</div>
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</div>
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</div>
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<div id="outline-container-orgd766270" class="outline-2">
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<h2 id="orgd766270"><span class="section-number-2">3</span> Comparison PI / Cedrat</h2>
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<div class="outline-text-2" id="text-3">
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<p>
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<a id="org9834afb"></a>
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</p>
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</div>
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<div id="outline-container-orgbec8ff4" class="outline-3">
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<h3 id="orgbec8ff4"><span class="section-number-3">3.1</span> Results</h3>
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<div class="outline-text-3" id="text-3-1">
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<div class="org-src-container">
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<pre class="src src-matlab">ce_results = load(<span class="org-string">'cedrat_la75b_high_1_stack.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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pi_results = load(<span class="org-string">'pi_505_high.mat'</span>, <span class="org-string">'t'</span>, <span class="org-string">'V_in'</span>, <span class="org-string">'V_out'</span>);
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</pre>
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</div>
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<div class="org-src-container">
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<pre class="src src-matlab">Ts = 1e<span class="org-type">-</span>4;
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win = hann(ceil(0.1<span class="org-type">/</span>Ts));
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[tf_ce, f] = tfestimate(ce_results.V_in, ce_results.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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[tf_pi, <span class="org-type">~</span>] = tfestimate(pi_results.V_in, pi_results.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
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</pre>
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</div>
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<p>
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We remove the phase delay due to the time delay of the ADC/DAC:
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</p>
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<div class="org-src-container">
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<pre class="src src-matlab">angle_delay = 180<span class="org-type">/</span><span class="org-constant">pi</span><span class="org-type">*</span>angle(squeeze(freqresp(exp(<span class="org-type">-</span>s<span class="org-type">*</span>Ts), f, <span class="org-string">'Hz'</span>)));
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</pre>
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</div>
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<div id="orgc1176e8" class="figure">
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<p><img src="figs/tf_amplifiers_comp.png" alt="tf_amplifiers_comp.png" />
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</p>
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<p><span class="figure-number">Figure 5: </span>Comparison of the two Amplifier transfer functions</p>
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</div>
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</div>
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</div>
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</div>
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|
<div id="outline-container-org2f91855" class="outline-2">
|
|
<h2 id="org2f91855"><span class="section-number-2">4</span> Impedance Measurement</h2>
|
|
<div class="outline-text-2" id="text-4">
|
|
<p>
|
|
<a id="org36e302c"></a>
|
|
</p>
|
|
<p>
|
|
The goal is to experimentally measure the output impedance of the voltage amplifiers.
|
|
</p>
|
|
|
|
<p>
|
|
To do so, the output voltage is first measure without any load (\(V\)).
|
|
It is then measure when a 10Ohm load is used (\(V^\prime\)).
|
|
</p>
|
|
|
|
<p>
|
|
The load (\(R = 10\Omega\)) and the internal resistor (\(R_i\)) form a voltage divider, and thus:
|
|
\[ V^\prime = \frac{R}{R + R_i} V \]
|
|
</p>
|
|
|
|
<p>
|
|
From the two values of voltage, the internal resistor value can be computed:
|
|
\[ R_i = R \frac{V - V^\prime}{V^\prime} \]
|
|
</p>
|
|
</div>
|
|
<div id="outline-container-orgebadc67" class="outline-3">
|
|
<h3 id="orgebadc67"><span class="section-number-3">4.1</span> Cedrat Technology</h3>
|
|
<div class="outline-text-3" id="text-4-1">
|
|
</div>
|
|
<div id="outline-container-org947e6a7" class="outline-4">
|
|
<h4 id="org947e6a7"><span class="section-number-4">4.1.1</span> Compute Impedance</h4>
|
|
<div class="outline-text-4" id="text-4-1-1">
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R = 10; <span class="org-comment">% Resistive Load used [Ohm]</span>
|
|
V = 0.998; <span class="org-comment">% Output Voltage without any load [V]</span>
|
|
Vp = 0.912; <span class="org-comment">% Output Voltage with resistice load [V]</span>
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R <span class="org-type">*</span> (V <span class="org-type">-</span> Vp)<span class="org-type">/</span>Vp;
|
|
</pre>
|
|
</div>
|
|
|
|
<pre class="example">
|
|
0.94298
|
|
</pre>
|
|
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R = 47; <span class="org-comment">% Resistive Load used [Ohm]</span>
|
|
V = 4.960; <span class="org-comment">% Output Voltage without any load [V]</span>
|
|
Vp = 4.874; <span class="org-comment">% Output Voltage with resistice load [V]</span>
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R <span class="org-type">*</span> (V <span class="org-type">-</span> Vp)<span class="org-type">/</span>Vp;
|
|
</pre>
|
|
</div>
|
|
|
|
<pre class="example">
|
|
0.8293
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-org876a45b" class="outline-4">
|
|
<h4 id="org876a45b"><span class="section-number-4">4.1.2</span> Effect of Impedance on the phase drop</h4>
|
|
<div class="outline-text-4" id="text-4-1-2">
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">C_1 = 5e<span class="org-type">-</span>6; <span class="org-comment">% Capacitance in [F]</span>
|
|
C_2 = 10e<span class="org-type">-</span>6; <span class="org-comment">% Capacitance in [F]</span>
|
|
C_3 = 15e<span class="org-type">-</span>6; <span class="org-comment">% Capacitance in [F]</span>
|
|
|
|
Ri = R <span class="org-type">*</span> (V <span class="org-type">-</span> Vp)<span class="org-type">/</span>Vp; <span class="org-comment">% Internal resistance [Ohm]</span>
|
|
G0 = 20;
|
|
|
|
G_1 = G0<span class="org-type">/</span>(1<span class="org-type">+</span>Ri<span class="org-type">*</span>C_1<span class="org-type">*</span>s);
|
|
G_2 = G0<span class="org-type">/</span>(1<span class="org-type">+</span>Ri<span class="org-type">*</span>C_2<span class="org-type">*</span>s);
|
|
G_3 = G0<span class="org-type">/</span>(1<span class="org-type">+</span>Ri<span class="org-type">*</span>C_3<span class="org-type">*</span>s);
|
|
</pre>
|
|
</div>
|
|
|
|
|
|
<div id="org9b2ba7f" class="figure">
|
|
<p><img src="figs/change_capa_cedrat.png" alt="change_capa_cedrat.png" />
|
|
</p>
|
|
<p><span class="figure-number">Figure 6: </span>Effect of a change of the piezo capacitance on the Amplifier transfer function</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-org6c099fc" class="outline-3">
|
|
<h3 id="org6c099fc"><span class="section-number-3">4.2</span> PI</h3>
|
|
<div class="outline-text-3" id="text-4-2">
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R = 10; <span class="org-comment">% Resistive Load used [Ohm]</span>
|
|
V = 1.059; <span class="org-comment">% Output Voltage without any load [V]</span>
|
|
Vp = 0.828; <span class="org-comment">% Output Voltage with resistice load [V]</span>
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R <span class="org-type">*</span> (V <span class="org-type">-</span> Vp)<span class="org-type">/</span>Vp
|
|
</pre>
|
|
</div>
|
|
|
|
<pre class="example">
|
|
2.7899
|
|
</pre>
|
|
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R = 10; <span class="org-comment">% Resistive Load used [Ohm]</span>
|
|
V = 2.092; <span class="org-comment">% Output Voltage without any load [V]</span>
|
|
Vp = 1.637; <span class="org-comment">% Output Voltage with resistice load [V]</span>
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R <span class="org-type">*</span> (V <span class="org-type">-</span> Vp)<span class="org-type">/</span>Vp
|
|
</pre>
|
|
</div>
|
|
|
|
<pre class="example">
|
|
2.7795
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-org67f8be8" class="outline-2">
|
|
<h2 id="org67f8be8"><span class="section-number-2">5</span> Effect of filters configuration on the PI-E505 dynamics</h2>
|
|
<div class="outline-text-2" id="text-5">
|
|
<p>
|
|
<a id="org846f3ab"></a>
|
|
</p>
|
|
</div>
|
|
<div id="outline-container-orgf08c313" class="outline-3">
|
|
<h3 id="orgf08c313"><span class="section-number-3">5.1</span> PI</h3>
|
|
<div class="outline-text-3" id="text-5-1">
|
|
<p>
|
|
Three measurements are done:
|
|
</p>
|
|
<ul class="org-ul">
|
|
<li>Slew Rate limitation at maximum</li>
|
|
<li>Slew Rate limitation at minimum</li>
|
|
<li>Notch Filter at maximum frequency</li>
|
|
</ul>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">pi_sr_min = load(<span class="org-string">'pi_slew_rate_min.mat'</span>);
|
|
pi_sr_max = load(<span class="org-string">'pi_slew_rate_max.mat'</span>);
|
|
pi_sr_max_notch = load(<span class="org-string">'pi_slew_rate_max_notch_high.mat'</span>);
|
|
pi_sr_load = load(<span class="org-string">'pi_slew_rate_max_notch_high_2stacks.mat'</span>);
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">Ts = 1e<span class="org-type">-</span>4;
|
|
win = hann(ceil(0.1<span class="org-type">/</span>Ts));
|
|
|
|
[tf_sr_min, f] = tfestimate(pi_sr_min.V_in, pi_sr_min.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
|
|
[tf_sr_max, <span class="org-type">~</span>] = tfestimate(pi_sr_max.V_in, pi_sr_max.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
|
|
[tf_sr_max_notch, <span class="org-type">~</span>] = tfestimate(pi_sr_max_notch.V_in, pi_sr_max_notch.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
|
|
[tf_sr_load, <span class="org-type">~</span>] = tfestimate(pi_sr_load.V_in, pi_sr_load.V_out, win, [], [], 1<span class="org-type">/</span>Ts);
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">angle_delay = 180<span class="org-type">/</span><span class="org-constant">pi</span><span class="org-type">*</span>angle(squeeze(freqresp(exp(<span class="org-type">-</span>s<span class="org-type">*</span>Ts), f, <span class="org-string">'Hz'</span>)));
|
|
</pre>
|
|
</div>
|
|
|
|
|
|
<div id="org5d55cf1" class="figure">
|
|
<p><img src="figs/pi_slew_rate_notch.png" alt="pi_slew_rate_notch.png" />
|
|
</p>
|
|
<p><span class="figure-number">Figure 7: </span>Effect of a change in the slew rate limitation and notch filter</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-orge828488" class="outline-3">
|
|
<h3 id="orge828488"><span class="section-number-3">5.2</span> Transfer function of the Voltage Amplifier</h3>
|
|
<div class="outline-text-3" id="text-5-2">
|
|
<p>
|
|
The identified transfer function still seems to match the one of a notch filter at 5kHz.
|
|
</p>
|
|
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">w_nf = 2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>5e3; <span class="org-comment">% Notch Filter Frequency [rad/s]</span>
|
|
G = 10.5<span class="org-type">*</span>(s<span class="org-type">^</span>2 <span class="org-type">+</span> 2<span class="org-type">*</span>w_nf<span class="org-type">*</span>0.12<span class="org-type">*</span>s <span class="org-type">+</span> w_nf<span class="org-type">^</span>2)<span class="org-type">/</span>(s<span class="org-type">^</span>2 <span class="org-type">+</span> 2<span class="org-type">*</span>w_nf<span class="org-type">*</span>s <span class="org-type">+</span> w_nf<span class="org-type">^</span>2);
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
<div id="outline-container-orgd44e75c" class="outline-3">
|
|
<h3 id="orgd44e75c"><span class="section-number-3">5.3</span> With Load</h3>
|
|
<div class="outline-text-3" id="text-5-3">
|
|
<div class="org-src-container">
|
|
<pre class="src src-matlab">R = 2.78; <span class="org-comment">% Output Impedance [Ohm]</span>
|
|
C = 9e<span class="org-type">-</span>6; <span class="org-comment">% Load capacitance [F]</span>
|
|
|
|
G_amp = 10<span class="org-type">/</span>(1 <span class="org-type">+</span> s<span class="org-type">*</span>R<span class="org-type">*</span>C);
|
|
</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="postamble" class="status">
|
|
<p class="author">Author: Dehaeze Thomas</p>
|
|
<p class="date">Created: 2020-11-12 jeu. 10:11</p>
|
|
</div>
|
|
</body>
|
|
</html>
|