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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59 views

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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57 views

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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90 views

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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49 views

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. ...
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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 ...
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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 ...
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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 ...
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1answer
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 ...
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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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273 views

Gain not containg the output, non ideal, resistor

I was working a mathematical model of a non ideal op-amp circuit and I saw a slide in the following presentation: The question I have is the following: Why does the close-loop gain \$\frac{\text{V}_\...
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Increase gain of electret microphone amplifier powered by aircraft radio?

I am trying to build an amplifier to allow a cheap electret boom microphone to be used with an aircraft radio, but am unsure how to increase the gain to a usable level. I derived the attached design ...
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607 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 ...
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Phase Shift Of Operational Amplifier [duplicate]

From the datasheet the open loop phase shift is given as 90 degrees for a range of frequency. But why doesn't a a normal open loop inverting amplifier does not show this characteristics of the phase ...
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Power/current limitations of variable gain amplifier

I am working with a motor invention and I am wondering about the utility of variable gain amplifiers. I wonder how to achieve a high output current with such an amplifier¿
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Reduce audio amplifier output power [closed]

I need some help to adjust the volume of the amplifier. It is a 2.5 W amplifier and it has to be connected to a 2 W speaker. I want to reduce the gain of the amplifier in order to avoid damage to the ...
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3answers
7k views

Transfer function gain [closed]

\$H(s)\$ is the transfer function and we're looking for its magnitude gain. I went from the Laplace domain to the frequency domain by replacing \$s\$ with \$j\omega\$. However, the solution didn't ...
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where to add gain and volume controls to LM386 guitar amp circuit?

Im trying to make a super simple guitar amp. heres the circuit using an LM386 operational amplifier: What exactly would affect gain but not volume, and volume but not gain? In the example circuit on ...
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1answer
83 views

Why am I getting no gain from this differential circuit?

I am having difficulty understanding why I am getting unity gain from the circuit below. Before I added the common emitter stage, there was a gain of around 150, and I wanted to add another 10 X gain ...
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1answer
553 views

Simulating ADL5536 Gain Block with Ideal Amplifier

I'm trying to simulate the ADL5536 Gain Block in LTspice. A link to the datasheet can be shown below: http://www.analog.com/media/en/technical-documentation/data-sheets/ADL5536.pdf Analog Devices ...
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95 views

Using on-board amplifiers instead of external amplifiers

I'm trying to replicate a Silicon Photomultiplier array multiplexing scheme by SensL. The link to their application note is found here: http://sensl.com/downloads/ds/TN-...
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100 views

biploar amplifier, voltage gain, and determining resistor values

i've been struggling with this problem. it says that i need to set the resistors of this circuit that produces the highest voltage gain as possible. i got the voltage gain equation, but don't have a ...
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2answers
506 views

How to calculate the gain of the OP-AMP in this configuration

Sorry for my ignorance in this field but I have failed miserably trying to figure the gain of this circuit: simulate this circuit – Schematic created using CircuitLab Simulation shows that the ...
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401 views

Arduino controlled audio amplifier gain?

I've building a preamplifier that also functions as a headphone amplifier. When no headphones are present, the gain of the internal opamps should be 1x (unity), so that the signal can be passed out ...
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2answers
79 views

Experimentally measuring the gain of an amplifier with noise

Normally rms value and the mean value of a perfect DC voltage is same. So lets say I want to measure the gain of an amplifier. I first apply an offset Vin_off to the inputs, then I measure Vout_off. ...
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144 views

Can DC gain be smaller than the very low freq. AC gain in this amplifier?

An amplifier module has a 10Hz low pass filter. When I obtain the gain vs frequency graph by applying different freq. signals to the inputs I get a consistent plot for the gain. I use a function ...
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124 views

Inexplicably Amplifier Distortion

I was just experimenting with some different combinations of transistor stages and got this: simulate this circuit – Schematic created using CircuitLab Q1 and Q2 represent cascode, where ...
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1answer
1k views

Estimating gain tolerance

Estimate the gain tolerance (+/- X%) of the non-inverting amplifier in Fig. 3 assuming that the tolerance is solely determined by the errors in the resistor values. Only resistors involved in the gain ...
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1answer
532 views

BJT Differential Amplifier Common Mode & Differential Mode Gain

I have a few questions about how to derive the differential gain and common mode gains: simulate this circuit – Schematic created using CircuitLab Differential Gain: Taken from Art of ...
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1answer
345 views

1-dB Gain Compression Point in Amplifier

An amplifier has small-signal gain 15 dB and 1-dB gain compression at an input power of 13.2 dBm. The amplifier is used to amplify four modulated signals of equal power. To avoid problems with ...
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464 views

DC gain from Nyquist Plot

In the solution they have given like this Here I did't get how they directly wrote DC gain 1? I solved like this \$GM=\frac{1}{\left |G(s)\right||H(s)|}\$ Here H(s)=1 From the plot GM=0.5 So G(...
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How to compensate gain and offset errors

I have an analog circuit which has an offset error as well as an gain error. I can measure the analog output of the circuit and I am able to manipulate the gain of the circuit by means of a factor <...
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242 views

How to double the amplitude of an AC Signal

If I have an input signal, \$v_{in} = A\sin(2 \pi ft)\$ where 1 < A < 4V and 20 < f < 20 kHz, and I am wanting to double the signal's amplitude so that my output then becomes \$v_{out} = ...
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207 views

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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4answers
894 views

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 ...
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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 ...
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1answer
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 ...
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2answers
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. ...
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2answers
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 ...
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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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3answers
3k views

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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1answer
290 views

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 ...
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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 ...
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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 ...
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578 views

Maximum voltage gain

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: ...
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Why does adding a capacitor increase voltage gain? [duplicate]

I'm trying to get a bit of intuition when dealing with transistor amplifiers. I recently watched this tutorial, and wanted a bit more elaborate explanation about why adding the cap circled in blue ...

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