# Questions tagged [transconductance-amplifier]

A transconductance amplifier is an amplifier that takes a voltage as input and supplies a current as output.

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### MOSFET - Frequency response

I tried to do an exercise from my textbook where I have to discover the gain for mid frequencies of the MOSFET below, but I can't solve it. I got stuck at one point. I drew the small signal ...
30 views

### Feedback network of transconductance amplifier with capacitor

simulate this circuit – Schematic created using CircuitLab How do I work on circuits that have capacitors as part of their feedback network? How can I calculate the feedback factor of the above ...
1 vote
315 views

### Basic Transistor Transconductance Amplifier - Negative Current Gain?

I'm working through The Art of Electronics. In chapter 2, it breaks a common-emitter amplifier into two stages: a transconductance stage and a resistive load stage (or transresistance amplifier). ...
80 views

### Can't compute the value of Resistance of Operational Transconductance Amplifier [duplicate]

I have the following Operational Transconductance Amplifier that I need to implement in LTSpice. I need to choose a value for $R_2$ and $C_{inf}$ in order to have a (theoretical)gain value \\$A_v=...
561 views

### Subthreshold Transconductance Amplifier

As part of a broader project, I am designing IC circuit using CMOS to one of the first steps I'm working on is the filtering a series of pulses with of the noise. The actual pulses are around 1 kHz so ...
1 vote
2k views

### LTSpice Transconductance Amplifier Simulation

I'm trying to simulate a band-pass transconductance amplifier in LTSpice, which looks like this: I used the recommendations of this post - https://electronics.stackexchange.com/a/278870/87695 - and ...
1k views

### Op-Amp and MOSFET current source not behaving as expected

Based on the circuit from this page called transconductance amplifier, I decided to build an adjstable constant current source for up to 1.6A: Current is set by the voltage divider connected to the ...
1 vote
5k views

### Calculate transfer function of transconductance amplifier circuit

How can I model/calculate the behavior from Vin to Iout of the following circuit? (Credits of the picture go to Analog Devices): Essentially, I am interested in the large signal response, such as a ...
181 views

### Transconductance amplifier question

I'm testing my first ever OP amp circuit and I ran into a problem. I have done the following circuit (see picture). The 0 - 3.3V called uC is coming from a Nordic nRF24LE1 PWM and RC filtered output. ...
11k views

### When should I be considering an operational transconductance amplifier (OTA)?

I found a few questions roughly related to this: How is a transconductance amplifier used to measure current? Operational Transconductance Amplifier Input Configurations Dead or alive: Operational ...
1 vote