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title = "Transconductance Amplifiers"
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author = ["Dehaeze Thomas"]
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2020-09-08 16:00:29 +02:00
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draft = false
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2021-09-29 22:30:09 +02:00
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category = "equipment"
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+++
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Tags
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2022-03-15 16:40:48 +01:00
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: [Electronics]({{< relref "electronics.md" >}}), [Voice Coil Actuators]({{< relref "voice_coil_actuators.md" >}})
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2020-10-19 10:13:36 +02:00
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## Description {#description}
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A Transconductance Amplifier converts the control voltage into current with a current source characteristic.
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Such a converter is called a voltage-to-current converter, also named a voltage-controlled current source or _transconductance_ amplifier.
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2022-10-27 17:57:43 +02:00
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Such amplifier is used to control motors (e.g. voice coil, BLDC, stepper motors, ...).
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## Specifications {#specifications}
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### Noise {#noise}
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```matlab
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BL = 20; % [N/A]
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m = 1; % [kg]
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```
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```matlab
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freq = logspace(0,4,1000); % [Hz]
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%% Current noise of the amplifier
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I_asd = 1e-6*ones(size(freq)); % [A/sqrt(Hz)]
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```
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```matlab
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x_asd = I_asd*(BL/m)./(2*pi*freq).^2;
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```
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```matlab
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figure;
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plot(freq, x_asd)
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xlabel("Frequency [Hz]");
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ylabel("ASD [$m/\sqrt{Hz}$]");
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set(gca, 'Xscale', 'log');
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set(gca, 'Yscale', 'log');
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```
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```matlab
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figure;
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plot(freq, sqrt(flip(-cumtrapz(flip(freq), flip(x_asd.^2)))))
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xlabel("Frequency [Hz]");
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ylabel("Cumulative Amplitude Spectrum [m rms]");
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set(gca, 'Xscale', 'log');
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set(gca, 'Yscale', 'log');
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```
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## Manufacturers {#manufacturers}
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<a id="table--tab:table-name"></a>
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<div class="table-caption">
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<span class="table-number"><a href="#table--tab:table-name">Table 1</a>:</span>
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Drivers with integrated controllers
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</div>
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2022-11-02 10:01:09 +01:00
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| Model | Manufacturer | Linear / PWM | Axes | Interfaces | Feedback | Current Bandwidth | ASD at 1kHz [A/sqrt(Hz)] |
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|-----------------------------------------------------------------------------------------------------------------------------------|-----------------|--------------|----------------|---------------|--------------|-------------------|--------------------------|
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| [Apogee](https://prodrive-technologies.com/motion/products/servo-drives/apogee-kepler-series/) | Prodrive | PWM | 1 to 3 | +/-10V 16bits | Encoder | 7kHz | 1e-6 |
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| [S3-400/8](https://prodrive-technologies.com/motion/products/servo-drives/cygnus-series/) | Prodrive | PWM | 1 | +/-10V | Encoder | 1kHz | 1e-4 |
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| [LWM7S](https://www.maccon.co.uk/linear-servo-amplifier.html) | Macon | Linear | 1 | | Encoder/Hall | | |
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| [Soloist ML](https://www.aerotech.com/product/motion-control-platforms/soloist-ml-controller-and-linear-digital-drive/) | Aerotech | Linear | 1 | +/-10V 16bits | Encoder/Hall | | |
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| [Automation1 XL4s](https://www.aerotech.com/product/motion-control-platforms/automation1-xl4s-high-performance-voice-coil-drive/) | Aerotech | Linear | 1 (voice coil) | +/-10V 16bits | ? | | |
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| [Automation1 XL2e](https://www.aerotech.com/product/motion-control-platforms/automation1-xl4s-high-performance-voice-coil-drive/) | Aerotech | Linear | 1 | +/-10V 16bits | Encoder/Hall | 2.5kHz | |
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| [EM-356B](https://electromen.com/en/products/item/motor-controllers/brushless-dc-motor/EM-356B) | Electromen | PWM | 1 | 0-10V | Hall | | |
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| [azbh10a4](https://www.a-m-c.com/product/azbh10a4/) | AMC | PWM | 1 | +/-10V | Hall | | |
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| [X-MCC](https://www.zaber.com/products/controllers-joysticks/X-MCC) | Zaber | ?? | 1 to 4 | | | | |
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| [TA310](https://www.trustautomation.com/products/linear-drives/ta310-linear-drive/) | TrustAutomation | Linear | 1 | +/-10V | Hall | 5kHz | |
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<a id="table--tab:table-name"></a>
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<div class="table-caption">
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<span class="table-number"><a href="#table--tab:table-name">Table 2</a>:</span>
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Pure Drivers
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</div>
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2022-11-02 10:01:09 +01:00
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| Model | Manufacturer | Linear / PWM | Axes | Interfaces | Current Bandwidth | Max Current | ASD at 1kHz [A/sqrt(Hz)] |
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------------|------------------------|------------|-------------------|-------------|--------------------------|
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| [LA300](https://varedan.com/product/analog-linear-servo-amplifiers/la-300-analog-linear-servo-amplifier/) | Varedan | Linear | 3 | +/-10V | 10kHz | 4A | |
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| [LA24](https://www.cedrat-technologies.com/en/technologies/actuators/magnetic-actuators-motors.html) | Cedrat | Linear | 3 | +/-10V | 35kHz | 1.5A | |
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| [CMAu10](https://www.cedrat-technologies.com/en/products/magnetic-controllers/oem-amplifiers.html) | Cedrat | Linear | 1 | +/-10V | 5kHz | 0.5A | |
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| [TA115](https://www.trustautomation.com/products/linear-drives/ta115-linear-drive/) and [TA105](https://www.trustautomation.com/products/linear-drives/ta105-linear-drive/) | TrustAutomation | Linear | 1 | +/-10V | 5kHz | | 1e-6 |
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| [SMA6520](https://www.glentek.com/shop/?swoof=1&product_cat=linear-brushless-series&really_curr_tax=21-product_cat) | Glentek | Linear | 1 Brushless (3 phases) | +/-10V | 10kHz | | |
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| [SMA5005](https://www.glentek.com/shop/?swoof=1&product_cat=linear-brush-series&really_curr_tax=21-product_cat) | Glentek | Linear | 1 | +/-10V | 10kHz | | |
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## Bibliography {#bibliography}
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<style>.csl-entry{text-indent: -1.5em; margin-left: 1.5em;}</style><div class="csl-bib-body">
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</div>
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