Analyze new measurements

test-bench-pd200.org

@@ -1180,7 +1180,12 @@ And it is verified that the Amplitude Spectral Density of $n_{da}$ is much large
 
 #+begin_src matlab :exports none
 %% DAC Output Voltage Noise
-dac = load('mat/noise_preamp_5113_dac.mat', 't', 'Vn', 'notes');
+dac = load('mat/noise_dac_1.mat', 't', 'Vn', 'notes');
+#+end_src
+
+#+begin_src matlab :exports none
+%% DAC Output Voltage Noise
+dac = load('mat/noise_dac_2.mat', 't', 'Vn', 'notes');
 #+end_src
 
 #+begin_src matlab :exports none
@@ -2288,7 +2293,7 @@ addpath('./mat/');
 <<sec:tf_comp>>
 
 #+begin_src matlab
-la75 = load('tf_la75_10uF_small_signal.mat', 't', 'Vin', 'Vout');
+la75 = load('tf_la75b_10uF_small_signal.mat', 't', 'Vin', 'Vout');
 pd200 = load('tf_pd200_1_10uF_small_signal.mat', 't', 'Vin', 'Vout', 'notes');
 #+end_src
 
@@ -2304,6 +2309,7 @@ win = hanning(ceil(0.5*Fs)); % Hannning Windows
 
 [tf_pd200, f] = tfestimate(pd200.Vin, 20*pd200.Vout, win, [], [], 1/Ts);
 [tf_la75,  ~] = tfestimate(la75.Vin,  la75.Vout,     win, [], [], 1/Ts);
+f_max = 2.6e3;
 #+end_src
 
 #+begin_src matlab :exports none
@@ -2313,7 +2319,7 @@ tiledlayout(2, 1, 'TileSpacing', 'None', 'Padding', 'None');
 ax1 = nexttile;
 hold on;
 plot(f, abs(tf_pd200))
-plot(f(f<900), abs(tf_la75(f<900)))
+plot(f(f<f_max), abs(tf_la75(f<f_max)))
 hold off;
 set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
 ylabel('Amplitude $V_{out}/V_{in}$ [V/V]'); set(gca, 'XTickLabel',[]);
@@ -2323,32 +2329,47 @@ ylim([10, 30]);
 ax2 = nexttile;
 hold on;
 plot(f, 180/pi*angle(tf_pd200), 'DisplayName', 'PD200')
-plot(f(f<900), 180/pi*angle(tf_la75(f<900)),  'DisplayName', 'LA75')
+plot(f(f<f_max), 180/pi*angle(tf_la75(f<f_max)),  'DisplayName', 'LA75')
 set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
 xlabel('Frequency [Hz]'); ylabel('Phase [deg]');
 hold off;
-yticks(-360:2:360);
-ylim([-12, 2]);
+yticks(-360:5:360);
+ylim([-25, 5]);
 legend('location', 'southwest');
 
 linkaxes([ax1,ax2],'x');
 xlim([1, 5e3]);
 #+end_src
 
+#+begin_src matlab :tangle no :exports results :results file replace
+exportFig('figs/comp_amp_tf.pdf', 'width', 'wide', 'height', 'tall');
+#+end_src
+
+#+name: fig:comp_amp_tf
+#+caption: Comparison of the identified transfer function from input voltage to output voltage
+#+RESULTS:
+[[file:figs/comp_amp_tf.png]]
+
+
 ** Noise Characteristics
 <<sec:noise_comp>>
 
-#+begin_src matlab :exports none
+#+begin_src matlab
 pd200 = load('mat/noise_PD200_1_10uF.mat', 't', 'Vout', 'notes');
 la75  = load('mat/noise_la75_10uF.mat', 't', 'Vout', 'notes');
 #+end_src
 
 #+begin_src matlab
+pd200.gain = 20;
+la75.gain = 20;
+#+end_src
+
+#+begin_src matlab :exports none
 pd200.Vout = pd200.Vout/pd200.notes.pre_amp.gain;
 la75.Vout  = la75.Vout/la75.notes.pre_amp.gain;
 #+end_src
 
-#+begin_src matlab
+#+begin_src matlab :exports none
 figure;
 hold on;
 plot(pd200.t, 1e3*pd200.Vout)
@@ -2359,6 +2380,16 @@ ylabel('Voltage [mV]');
 % ylim([-3, 3]);
 #+end_src
 
+#+begin_src matlab :tangle no :exports results :results file replace
+exportFig('figs/comp_amp_noise_time.pdf', 'width', 'wide', 'height', 'normal');
+#+end_src
+
+#+name: fig:comp_amp_noise_time
+#+caption: Measured Output voltage noise
+#+RESULTS:
+[[file:figs/comp_amp_noise_time.png]]
+
+
 #+begin_src matlab :exports none
 % Sampling time / frequency
 Ts = (pd200.t(end) - pd200.t(1))/(length(pd200.t) - 1);
@@ -2377,12 +2408,10 @@ la75.f = f;
 #+end_src
 
 #+begin_src matlab :exports none
-colors = get(gca,'colororder');
-
 figure;
 hold on;
-plot(pd200.f, sqrt(pd200.pxx), 'DisplayName', 'PD200');
-plot(la75.f,  sqrt(la75.pxx),  'DisplayName', 'LA75');
+plot(pd200.f, sqrt(pd200.pxx)/pd200.gain, 'DisplayName', 'PD200');
+plot(la75.f,  sqrt(la75.pxx)/la75.gain,  'DisplayName', 'LA75');
 hold off;
 set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
 xlabel('Frequency [Hz]'); ylabel('ASD [$V/\sqrt{Hz}$]');
@@ -2390,6 +2419,15 @@ legend('location', 'southeast');
 xlim([1, Fs/2]);
 #+end_src
 
+#+begin_src matlab :tangle no :exports results :results file replace
+exportFig('figs/comp_amp_noise_asd.pdf', 'width', 'wide', 'height', 'tall');
+#+end_src
+
+#+name: fig:comp_amp_noise_asd
+#+caption: Comparison of the amplifier input noise ASD
+#+RESULTS:
+[[file:figs/comp_amp_noise_asd.png]]
+
 * Conclusion
 <<sec:conclusion>>