# Questions tagged [gain]

Simply 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, current of may even have a digital representation. A very general concept sometimes used to describe attenuation (when gain < 1)

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### Dependence of transistor current gain on operating conditions

According to "Gray & Meyer: Analysis and Design of Analog integrated circuits" transistor current gain Beta (in forward-active region) depend on operating conditions of the transistor. Region 1 ...
9k views

### What is the bypass capacitor at the emitter of a common-emitter amplifier for?

Why do we have the by pass capacitor parallel to R(E) in this amplifier circuit? They say it is to bypasses the RE resistor for AC signals but then why is it required to by pass the R(E) They say ...
62k views

### Choosing resistor values for inverting amplifier and why?

The gain here is A = -Rf/Rin. However, lets say I want a gain of 10 V/V. Which resistor value would you choose and why? I know that you could have infinite number of combinations for these resistors ...
13k views

### Confusion between Voltage gain & Voltage gain in decibels (dB)

The definition of voltage gain is $V_{\text{out}}/V_{\text{in}}$. However, I read some articles about the gain in decibels, and I have a confusion now. Here is an article about it: https://en....
9k views

### Switching op-amp gain resistances - how?

Given the following circuit: What is the component / circuit I should be using to switch the signal between each of the gain resistors? (the ⊠s in the schematic) The inputs ID0 to ID2 are TTL (...
9k views

### What is noise gain, really? And how is it determined in the general case?

UPDATE: This question triggered what might fairly be called a research obsession for me. I've gotten pretty close to the bottom of it I think, I've posted my findings as an answer below. There was a ...
811 views

### What is the closed-loop gain in this op amp circuit?

For the op amp below Open-loop gain is $A=2\times10^5$ Input resistance is $R_i=2\,M\Omega$ Output resistance is $R_o=50\,\Omega$ I am asked to calculate the close-loop gain $Vo/Vs$ and ...
3k views

### Can someone explain this gain & offset op-amp circuit?

I'm having trouble understanding the circuit in the photo below. I know that it's a gain and offset amp designed to convert 0-2.5 V range to +/-10 V range (hence it has a gain of 8 and an offset of -...
40k views

### Op Amp gain less than 1?

How would I design an op amp with a gain of less than 1? Is this even possible? Also would it matter if I used a non inverting or an inverting op amp? I've designed a non-inverting op amp with a ...
292 views

### Gain of an active filter without calculating the transfer function with two OP-AMPs

I need to calculate the gain of the filter without explicitly calculating the transfer function, ie I have to replace the capacitors with an open circuit. The problem is that I've been trying to solve ...
169 views

### Mid-band magnitude gain of a Cascode Amplifier

Looking to do some theoretical analysis on a Cascode Amplifier and compare it to a simulated model. Please see the circuit schematic below followed by the bode plot developed in the simulation ...
3k views

### Why is an op amp's bandwidth higher at lower gains?

If I build a resistor network where the op amp has a lower gain, it is able to maintain its gain for a larger bandwidth. Why?
13k views

### What potentiometer should I choose?

I want to create a sound amplifier with the LM386 and I need a potentiometer. I don't have a clue what I'm doing (:P) but I've printed out the datasheet (for the LM386) and had a look at it. So I ...
849 views

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### Determining Open Loop Gain of an opamp in LTspice

I'm trying to extract two characteristics: "Input Offset Voltage" and "Open Loop Gain" of an opamp LM741 by using LTspice. To do that, I use the following circuit model and plots where the horizontal ...
606 views

### Do the temperature coefficients of the resistors in the LM399/LM199 “Portable Calibrator” significantly effect the output stability?

I'd like to know how voltage reference stability is obtained in products like 6.5 digit multimeters that use LM399 as a voltage reference in spite of using two gain resistors. Let's assume an ideal ...
6k views

### Determining DC gain of single supply op-amp (no AC component)

I'm building a homebrew PIC programmer, and want to support devices with varying Vpp voltages, so I'm using the DAC output of a PIC16F1825. But the PIC is supplied with a +5V Vdd, so that's the ...
846 views

### op amp with single supply - non inverting circuit gain not being produced

I'm trying to boost a 12V signal to around 100-120V using an opamp from a single 12V 5A supply voltage (gain of about 10). I can't seem to get it to work though. Right now I'm just trying to make a ...
568 views

### What is meant by “adjustment of the output gain and offset” of a Force Sensitive Resistor interface circuitry?

A FSR (Force Sensitive Resistor) is a sensor which lowers its resistance when there is force upon it. At idle state (no push force) it has a high resistance (~ MOhms) Interlink Electronics has ...
541 views

### What is the relation between the gain and range of a data-acquisition amplifier?

A data-acquisition amplifier has different ranges. The board amplifiers a voltage sample and ADC converts it to a digital code. There is probably a reference voltage inside the board so it compares ...
3k views

### Gain-bandwidth product proof for open loop/closed loop opamp

On the forum, post #12, Ghar claimed that the proof gain-bandwidth product from wikipedia is awful and he gave another proof but with feedback. https://en.wikipedia.org/wiki/Gain%E2%80%...
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### How to operate Op-Amp[OP07CP] with 0-5v supply?

I don't know why I cannot operate Op-Amps! this is my second circuit and I'm trying to make a non-inverting amplifier by an OP07CP. This is my circuit + an example of measured values: simulate this ...
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### Gain of an active filter without calculating the transfer function with two OP-AMP's [duplicate]

I need to calculate the gain of the filter without explicitly calculating the transfer function, ie I have to replace the capacitors with an open circuit. The problem is that I've been trying to solve ...