# Questions tagged [transconductance]

The transconductance of a device relates the current through the output of the device to the voltage across the input of the device.

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### Converting 1 - 5V signal to 4 - 20mA signal

reference: https://www.analog.com/media/en/technical-documentation/technical-articles/D61_EN-Convert.pdf I am trying to convert a 1-5V signal to a 4-20mA signal using this circuit but it was not ...
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### Interview Question

This Circuit was given. I know every component of this circuit individually, I know feedback and gain margin and transconductance amplifier. But the problem is how to start? first, I was thinking to ...
• 180
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### How to derive effective transconductance versus oscillation amplitude in a oscillator?

In the page below in the lecture note shows a plot of effective transconductance versus oscillation amplitude. How is it derived? Or is there any source to derive effective transconductance versus ...
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### Bidirectional voltage-to-current converter

How to make the following voltage-to-current converter bidirectional, so that bidirectional current can be driven through the load?
81 views

### Push-Pull voltage-to-current converter

How to make the following voltage-to-current converter bidirectional, so that it maintains the requested current through the load, even when that load stores energy and attempts to oppose the ...
87 views

### Calculation of transconductance in a MOSFET

I am teaching electronics. I have come across this formula for drain current in the syllabus that I am teaching. However, I have never seen it before. My question is where is this number -3 from ...
69 views

### Interpreting the value of transconductance shown in a MOSFET datasheet. Why was that particular value chosen to be shown?

Context: I'm a beginner in electronics, self studying MOSFETS. I'm trying to understand why the manufacturer of this MOSFET decided to provide a single particular transconductance value in the ...
1 vote
44 views

### how to calculate rx, ro given gx and go from XSPICE

I have a set of XSPICE data extracted from multisim as can be seen in the attached image. How do I calculate the ro and rx (base spreading resistance) given the parameters go and gx. Thanks
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### output resistance and transconductance in the calculation of NMOS common source voltage gain

For a NMOS, the transconductance gm is defined as id/vgs at a fixed VDS. However when we calculate the small signal gain of a common source amplifier, we use vds = -id x RD and then vds = -gm x vgs x ...
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### Does transconductance of a NMOS in saturation vary if I double both 'W' and 'L'?

Gm for a mosfet in saturation is 2Id/Vov. Vov is constant and we expected the Id to be a constant too for both cases since Id(sat)=0.5*UnCox (W/L)(Vov^2), W/L is unchanged and there for Id should be a ...
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### What makes transconductance negative?

Quote... "transconductance is -1 amps/volt" Refer to this link for the source of my question... This reference lacks the negation of A/V while this reference includes it? I'm confused...to ...
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1 vote
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### Transconductance of MOSFET with channel-length modulation

As far as I understood, I think it could be derived as below. $$g_m = \frac{\sigma I_D}{\sigma V_{GS}} = \mu_n C_{ox} \frac{W}{L}(V_{GS}-V_{TH})(1+\lambda V_{DS})$$  = \sqrt{2\mu_n C_{ox}\frac{W}{...
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### Gmo2 from vout about differential amplificator

I'd like to know if this demostration is correct to calculate Gmo2 from vout about differential amplificator from this diagram : 1 : Gmo transconductance about Common Base configuration 2 : Gmo1 ...
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1 vote
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### Lack of data when performing hand calculations

This question refers to BJTs, FETs, MOSFETs, etc. When I am designing a one or more staged BJT transistor circuit I am often considering differential base-emitter resistance aka "rπ" and finite ...
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