# 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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### Headphone Amp Impedance Select Switch

I'm designing a headphone amplifier, and I'd like it to be compatible with both 32 ohm and 600 ohm headphones. Therefore, I figured I could introduce a switch which allows the user to change the gain ...
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### How to extract pol & zero data from amplifier's data sheet?

I am looking at the OPA548 amplifier's data sheet and trying to extract the corner frequencies but i am unable to accurately do it, as i can only make assumptions based on the open loop gain/phase ...
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### Circuit analysis to obtain the gain of an inverting Op-Amp

My problem is that I don't know how to prove that the gain of this circuit is given by the following relation. \begin{equation} G=\frac{U_o}{U_i}=-\frac{R_2}{R_1} \end{equation} I have the feeling ...
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### Gain of the amplifier

If we have open loop gain of 2dB or 3dB what happens if we use this in closed loop (except the gain reduction)..i mean how does gain affect on the output of feedback amplifier.
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### How to add dc offset and gain to a given signal

Before I start, I just want to mention that I am a premed student. However, I want to build a DIY amp for my headphones since my computer can't properly drive them so I decided to take an electronics ...
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### How to determine the gain of this op amp

I want to know how to determine the gain of the op amp signaled by an arrow, or get an ecuation described in terms of V1 that explains what’s going on in there. For the general problem, what I need to ...
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### How to calculate the feedack resistor in this configuration

I try to simulate the input stage of the ADC feeding circuit. ADC is 0-3.3V. The circuit: The Vin input signal: The output: The signal is shifted properly but the gain is lower than I expected. ...
853 views

### Roll-off of a filter

I know that the roll-off of a transfer function gain is given by: 20\log_{10}\left(\left|\text{H}\left(\omega_2\right)\right|\right)-20\log_{10}\left(\left|\text{H}\left(\omega_1\right)\right|\...
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### How to identify which transistor is in active region and which one is in saturation?

In the following amplifier circuit, voltage gain is required. Capacitors act as open circuit for DC analysis but short circuit for AC analysis (consider capacitor value to be very big). Now MOSFET ...
640 views

### Negative Gain and in a common gate FET amplifier [closed]

We conducted an experiment involving frequency response in common gate FET amplifier. The results at different frequencies from 10Hz to 1MHz are obtained and we got a negative result in the first few ...
87 views

### differentiating circuit voltage gain

Hi! I came across this question in lab, and it's been several years since I last done analog circuits. The voltage gain here in this op-amp should be 0.707 (-3db cut-off), and it asks us to find the ...
250 views

### Calculating gain of ICF amplifier

I'm designing a circuit with an ICF (indirect current feedback) amplifier, and am trying to calculate the gain of the resultant circuit. Using the AD8237 I followed the example here when designing ...
844 views

### What does “normalized” mean in this datasheet?

I came across the graph below in ONSemi's 2N3904 datasheet that depicts the DC current gain. I don't understand what "normalized" means. I've read other explanations by Googling, but found all of ...
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### Why is the gain of this LC two-port network infinite?

Consider the following two port network, where a voltage is measured across the output terminals (no current), and the input is connected to an AC power source: Calculating the voltage gain of this ...
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### Op-amps, why do they have such low output currents

An introduction to my question is that ultimately op-amps drive something with their output stage (i.e., they source or sink current). I am looking specifically at the current sourcing scenario for ...
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### Closed-Loop Voltage Gain of Circuit Problem

This might be a simple problem, but I simply cannot wrap my head around it; I'm still learning about ideal op-amps and electronics in general. The problem is: I have tried solving it using the gain ...
309 views

### H bridge's voltage, breaksdown when connected to a motor

My project is to build a car controlled by Bluetooth. first I'm building a H-bridge to control the motors. I'm using a 3v DC motor that needs a current of, 0.26A(no load) - 0.69A(with load) and I'm ...
245 views

### pH sensor buffering, gain, and offset with one inverting opamp

I'm working on the above mentioned circuit. I'm a hobbyist with little electronics training so don't laugh if something terribly dumb comes out of my keyboard please. Anyway, a different question on ...
524 views

### BJT Rpi Influence

This question was already asked (by me) and I'm gonna ask it again(because the influence of Rπ wasn't explained good enough), but this time it is going to be interpreted the other way than last time. ...
314 views

### x100 BJT Amplifier

I need to design an amplifier providing voltage gain of 100. Capacitor calculations are done based on 14 Hz high pass. Here's the design : Vcc = 9V Vin = 50mV, 20 Hz To calculate RC and RE, I ...
148 views

### Voltage drops across a Human Body (Set gain of InAmp)

I'm developing an application that sends an electrical signal to the human body. It is a bioimpedance system. This signal has approximately 3.2Vpp ranging between + 1.6V and -1.6V, at a frequency ...
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### Voltage gain of an amplifier?

Voltage gain of an amplifier is defined as "magnitude of output voltage / magnitude of input voltage" OR "Vout(r.m.s)/Vin(r.m.s)" OR "change in output voltage/change in input voltage" In the ...
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### LTspice gain enhancement sallen and key highpass simulation

I have been trying to simulated a filter and amplification circuit. In one of the stages I am using a LP Sallen and Key circuit and another I am using a HP Sallen and Key circuit. I can successfully ...
327 views

### NPN Transistor Parameter Determination Gain Question

In the interest of making an oscillator, I made the above circuit after reading about gain, current flow, active region, and how an NPN transistor works. I then put the circuit in LTSpice and note ...
255 views

### How to determine the gain of this OP AMP circuit?

I need to calculate the gain of this op amp circuit. It look like a differential op amp circuit, but i only have one resistor in the feedback loop, R3. This circuit functions as a Voltage level ...
Consider the following circuit: It is required to calculate the small signal voltage gain (i.e $\frac{v_o}{v_i}$) based on $R_s, R_c, I_c, V_A$ and β. So I draw the small signal model as below: ...