# 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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### Antenna Factor unit and calculation

The antenna factor equation in a 50-ohm system is expressed as: $$AF={9.73 \over \lambda*\sqrt(Gain)}$$ Where Gain is in dB, the wavelength in meter and the calculated AF is in dB/m.  First, How ...
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### I need help deriving the cutoff frequency of a negative feedback amplifier

I have the question and answer below for deriving the closed-loop cutoff frequency of a feedback amplifier circuit. I can follow the working out all the way until the last 2 lines, where the writer ...
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### Opamp: Does the openloop Gain changes depending on the Input stage?

In case for bipolar Input stages on Opamps: does the actucal Openloop gain changes depending on which input stage, n or p channel is used? (which depends on the applied input signal) Could not find ...
137 views

### Voltage gain in common emitter BJT amplifier (specific example)

What is the AC voltage gain in the following common emitter BJT amplifier? We are also given that for the BJT $\beta_{DC} = \beta_{ac} = 150$. simulate this circuit – Schematic created using ...
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### Amplifier design help

I am designing a two stage Amplifier for class, and I had asked for help before on the forum which helped a lot. Input is a 1v sine wave. My design was for a 5 voltage gain however I am only seeing 2....
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### Op-amp input signal problem, mismatched

My signal generator drives a 50 ohm coaxial cable, terminated with a 50 ohm to ground at the input of a voltage amplifier. However, when I look at my input signal over frequency, it doesn't behave as ...
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### Op-amp with constant output voltage (Peak to Peak)

I am new to opamps and am trying to amplify a variable frequency sine wave to a constant 5V peak-to-peak using opamps. The input signal amplitude changes with frequency, but the opamp should always ...
48 views

### Mosfet Amplifier design help

I am currently designing a MOSFET common source amplifier for my electronics lab class. My issues is that currently I am unable to obtain a gain out of my current circuit design. I am using a 2N7002 ...
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### Automatic gain control circuit with dc offset

I have a circuit that takes a sine wave amplifies it a little bit but also adds a DC offset of 1.5V. It works perfectly no matter the input volume. Now that I am reworking everything it would be nice ...
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### distance between linear and non-linear function of op-amp system

I have a circuit which I have taken a picture of as you can see, in which i have values of $$R1=1k\Omega,R2=10k\Omega,R3=10k\Omega.R4=10k\Omega,R5=20k\Omega$$ and sine input signal with off-set value=...
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### “Coupling” gain-setting resistors in a single-ended source, differential amplifier?

I am working on a fully differential amplifier design that receives a single-ended differential voltage from a piezo sensor. I computed a theoretical gain and selected appropriate resistors and it ...
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### Troubles with mic preamp for headphones with integrated microphone

I am designing a preamp intended to interface with a microphone in common headphones (e.g. apple earpods, or sony headphones with a microphone) which will then connect to my ADC's inputs. I've ...
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### Automatic gain controller gain action

Can you guys explain to me how the turning on of Q2 and the charging of C2 increases the vgs of the FET? An equation would be helpful.
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### [op amp - Gain current source - current reference]

I have a question about the formula to consider for calculation of the gain for the electronic bellow. Thanks for your support.
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### What are the units used in Shannon formula calculation?

I'm a CompSci student with absolutely no background in wireless communication who recently needs to do something with the Shannon formula: $$R = W log_2\bigg(1+\frac{P_t H^2}{N_0 W}\bigg)$$ I need ...
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### Two antennas, one board

Everybody. I have a doubt. If I use one connector like this: https://www.data-alliance.net/rp-sma-t-splitter-y-adapter-joiner-join-2-antenna-cables-to-one-connector/ In one board and connect two ...
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### Signal clipping in cascade transistor amplifiers

The two-layer voltage amplifier circuit can transfer a signal of up to Vi = 50 mV to the output without clipping.and 1st stages gain Av1=-6.41 . +15 volt is ...
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### Question on operational amplifiers

1. The following two questions refer to the circuit below. Consider a non-ideal op amp where the output can saturate. The open loop gain A = 2 x 10^4 , where vo =−A*Vs The positive supply voltage ...
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### Chebyshev filter - theoretical vs simulation gain

Question is about the gain peak (or maybe more suitable would be growth) ocurring in higher frequencies (>20kHz) in Chebyshev filter 4-th order in simulation (simulated using Bode Analyzer in NI ...