# Questions tagged [gain]

The ratio of output signal to input signal. This dimensionless quantity is a measure of the amplification of a signal which may be represented by voltage or current, or a digital number. It is a very general concept, sometimes used to describe attenuation (when gain < 1).

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### How to simulate for the Gain of opamp Bridge Differential Amplifier?

Hi experts, I have this circuit, with a bridge connected to an op-amp in differential form, and I want to simulate it for the Gain of the circuit in PSPICE. I have found it's gain by hand, which comes ...
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### Gain depending to Frequency [closed]

This script sets up a server that listens for incoming connections. It reads audio data from the client in chunks of 1024 bytes, processes it using FFT (Fast Fourier Transform) with frequency-...
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### switchable summing audio mixer volume troubles

Consider this audio mixer. There are 3 sources that may play any kind of audio (the sine generators are just illustrative). You can switch any of them to either of 2 outputs using the SPDT switches. I ...
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### MOSFET Operational Amplifier

I am confused. Why we always say that the gain of an op amp should be as large as we can? Supposing that an op amp has a power supply of 1.8 V, the voltage gain is 1000 V/V. If we give a small signal ...
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### Why is the gain of the amplifier not considered in the frequency calculations? (Sedra and Smith 6th edition, Example 1.5)

In example 1.5 in Sedra & Smith 6th edition, the author's answer for item b) is 1 Mrad/s. To get this answer, the author considers the amplifier as a passive LP network and uses the time constant ...
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### Why don't these resistors affect the gain in voltage divider bias?

Our textbook says that voltage gain is not affected by the R1 and R2 resistors, but I don't understand the reason behind it. Also, don't we get the 1/gm that is in the denominator from r(pi) resistor ...
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### How do I design a Multistage Amplifier with given specifications?

I have been tasked to design a multistage amplifier with the following specifications: Gain(V/V) = 30, Rin = 20 kohms, Rout < 25 ohms, Power supply = Dual +12V -12V, Max Symmetrical Swing > 9Vpp ...
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### Stages of audio amplification from mV to 20V+

I have been trying to learn how to amplify audio signals from very small signals (20mV) to large signals (20V+) while using only transistors. I have figured out how to build a class A common emitter ...
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### What is minimum gain crossover frequency in bode analysis?

I know gain crossover frequency at which magnitude of open loop transfer function is 0. But what is the case here for minimum Wgc?
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### Trying to add variable frequency and gain control to op amp function generator circuit [closed]

I was using a circuitstoday guide of a simple function generator using op amps and tried to repurpose it for variable amplitude control as well as frequency control using two potentiometers. I ...
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### How does dB apply for non-linear components?

I understand that decibels are used to express power and we can use 20log(V1/V2) and 10log(P1/P2) to find the voltage and power ratios. But what are we meant to do when it comes to non-linear ...
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### Analyzing unity gain feedback of AD8277

I have the following amplifier; its not large gain so I can't assume virtual ground. How do I analyze the transfer function of such amplifier? https://www.analog.com/en/products/ad8277.html
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### How stable is this trimpot?

From this question, I understand that the better solution to drop off the temperature dependence of the gain in variable gain amplifier is to set the potentiometer in a voltage divider configuration. ...
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### Stability factor in BJT

I was wondering if the stability factor is a feature for all BJTs and does one need two resistors in a voltage divider emitter bias or a single resistor is enough?
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### Control (0 - 10 V) fan from LM358

I want to generate output of (0 - 10 V) from ESP32 GPIO (0 - 3.3 V). Basically fan is connected to the output. I am attaching a circuit of it. Do I need any changes in the design or it will work? Will ...
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### How to calculate the gain and DC bias of the transistor circuit?

Here is the circuit of T41-EP. How to calculate the DC bias of the transistor circuit, and the gain of this circuit? More infomations:
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### Using a DAC to measure system gain

I am using a Wheatstone load gauge through an AD8295 op-amp to a SAMD21 uC ADC. The op-amp uses a resistor to set gain. An analog switch is used to change gain. Since the resistors are not exact (G = ...
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### Butterworth filter not getting as much gain as expected

Using the Analog Devices Filter Design Tool, I have created a band pass filter for a 1MHz input with 20dB of gain. I have implemented the circuit in LTSpice with the expected behaviour, however when I ...
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