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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 ...
Vibhav shivadeker's user avatar
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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-...
Phaze Music's user avatar
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1 answer
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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 ...
one_three_three_seven's user avatar
5 votes
3 answers
400 views

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 ...
jsdklfsldn's user avatar
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2 answers
118 views

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 ...
Fávero Santos's user avatar
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1 answer
56 views

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 ...
nwnd's user avatar
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1 answer
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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 ...
grandslam47's user avatar
2 votes
5 answers
154 views

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 ...
Marcus Marchese's user avatar
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45 views

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?
Swapnil sawake's user avatar
1 vote
2 answers
154 views

How to calculate the feedback loop gain with feedback \$\beta\$

The following is from the book Design of Analog CMOS Integrated Circuit, page 319. Let's break the loop at the gate of M1. $$V_{out} = - V_T g_m \biggr[ (R_S + R_F) \parallel R_D\biggr] $$ $$V_F = ...
kile's user avatar
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Transit vs Unity Gain Frequency of a MOSFET

As far as I understand, the unity gain frequency of a transistor is its gain-bandwidth product, and the transit frequency of a transistor is a measure of how fast it is. I've also read that the ...
user_9's user avatar
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2 votes
2 answers
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Gain of a negative feedback circuit (problem)

I am asked to find the gain A for this negative feedback circuit below: (A: gain, G: all of the gain of the circuit, F: return ratio) The simplified circuit above shows the gain A that I am trying to ...
kauselis3000's user avatar
1 vote
0 answers
91 views

Reduce gain of charge amplifier

I have a circuit for measuring piezo signals, roughly based on Analog Devices CN0350. It contains a charge amplifier that converts the piezos' charge to a voltage signal. When measuring signals of ...
Johannes's user avatar
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1 answer
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Does a single input differential amplifier remove noise?

It is known that the purpose of using a differential amplifier is to remove noise from the input signal, apart from giving some small amplification. To my knowledge, there are two inputs and two ...
Soumil Gupta's user avatar
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1 answer
96 views

How to improve gain in this amplifier?

I want to design an amplifier to drive an 8 ohm speaker. I am using a differential amp as the first stage, and then a class AB amplifier (inspired by the one I found here class AB amplifier distortion)...
Koustubh Jain's user avatar
2 votes
1 answer
248 views

Calculate the small-signal voltage gain of the circuit

The following is from the book Design of Analog CMOS Integrated Circuits, Page 155. Calculate the small-signal voltage gain of the circuit shown in Fig. 5.35. Well, the book said the gain is \$A_v = ...
kile's user avatar
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\$G_m\$ is zero in my calculation when doing gain analysis, what went wrong?

The following is from the book Design of Analog CMOS Integrated Circuits, page 147. In order to calculate this \$R_{out}\$. The following is the analysis for \$R_{out}\$ calculation. $$\frac{V_p} {...
kile's user avatar
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Does current mirror circuit have differential gain when there is one \$V_{out}\$?

The following is from the book Design of Analog CMOS Integrated Circuits, page 147: What's the gain of this circuit? Is it \$ \frac{V_{out}} {V_{in1} - V_{in2}}\$, \$\frac{V_{out}} {V_{in1}}\$ or \$\...
kile's user avatar
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1 vote
0 answers
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MOSFET small signal model question

Why is vgs = vin - vout as stated in the image? The book has gmvGS wrong as it's supposed to be a current source.
user359713's user avatar
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1 answer
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Is it possible to calculate gain when there is current source?

The following is from the book Design of Analog CMOS Integrated Circuits (https://electrovolt.ir/wp-content/uploads/2014/08/Design-of-Analog-CMOS-Integrated-Circuit-2nd-Edition-ElectroVolt.ir_.pdf) on ...
kile's user avatar
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1 answer
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Differential amplifier, calculation of differential and common gain

Maybe someone can help and knows how to calculate the differential gain and common-mode gain in a differential amplifier. Will the formula for differential gain be Ad=Rc/2Re, i.e. in my case 50/40=1....
grigoriii's user avatar
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2 answers
121 views

Differential amplifier gain calculation

I am currently working on a project and I found this differential amplifier for a shunt. I perfectly understand what is going on with the voltage follower op-amp, but I dont understand what is going ...
Pablo9026's user avatar
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0 answers
41 views

Digital adjustment of the gain of the cut-off points of the analog filter

As seen in the graph, I have a bandpass filter. The problem is that the signal gain decreases at the cutoff points, but I want my gain to create sharp corners, including the cutoff frequencies, and I ...
Electronx's user avatar
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0 votes
2 answers
203 views

Darlington pair problem

I was making a circuit using a Darlington pair with two C3266 transistors and I noticed that the total gain doesn't amount to the expected value. Instead of the total value be in accordance to the ...
imran muhd's user avatar
1 vote
0 answers
43 views

Alternate values of high pass filter isn't working, even though gain, phase & transient response is almost same

I'm trying to design a high pass filter to remove the humming noise (around 50-60Hz.) If I use alternate values, it's not working. It's the recommended value from a YouTube video (470pF, 5.6Mohm.). ...
Santhosh Kumar H O's user avatar
0 votes
0 answers
155 views

Gain of a signal passed through a N element phased array?

Assuming a isotropic phased array of N elements, the gain would be 10*log10(N) dB which is provided in theory. However, when same signal is passed through all the N elements, the gain is 20 * log10(N) ...
Pacific's user avatar
2 votes
2 answers
101 views

BJT Amplifier simulated gain is only around 80% of calculated gain. Why is this and how to improve calculation vs simulation accuracy?

I'm trying to design a CE BJT amplifier in Multisim with 100mVp 1kHz input, and target gain of around -208.8. Starting from my choice of Vcc = 50V and Ic(DC) = 15mA, here is the design I came up with: ...
KYT's user avatar
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0 votes
1 answer
310 views

Calculating a gain of a PWM Modulator with triangle carrier

I'd like to ask for help with calculating a gain of a PWM modulator using a triangle wave. I know how to calculate a gain in case with a sawtooth carrier with turning-on at the start of cycle. and ...
Bart's user avatar
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2 answers
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Calculate Gain of TS922

Im trying to figure out the gain of this opamp inside a st board. Here is the schematic where this opamp is used. As you can see, the closed loop opamp with feedback has a voltage divider on the ...
Tom's user avatar
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-1 votes
1 answer
99 views

I am having a hard time analyzing this type of circuit. How do I get the voltage gain? [closed]

I am trying to solve these questions but I can't even do the first step. What's a good method to deal with this type of circuit?
Pedro 's user avatar
3 votes
4 answers
247 views

How does resistance limit the gain in a common emitter amplifier? [closed]

I am having trouble understanding common emitter amplifiers. Can someone please explain how RE1 is limiting the gain of the amplifier in this circuit?
struggling student's user avatar
0 votes
1 answer
147 views

Opamp - Gain Simulations -LTspice

Hi I would be very happy if anyone can help me find the correct answer for opamp. I simulated an opamp to find Aol, 1/beta and Aol * B gains.I provided the picture of my Ltspice circuit, simulation ...
Mhan's user avatar
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0 votes
1 answer
66 views

Calculation of unity level (0dB) after gained VCA

Basically I'm controlling a VCA (AS2164) with my Arduino through a 10 bit DAC. All is working well. The VCA output is then gained x 3.3 though an op amp, which in my calculator gives a 10dB boost. The ...
Jesper Kragh's user avatar
1 vote
1 answer
153 views

How much gain I am getting and with the 2 stage transistor amplifier attached with a Global NFB [duplicate]

This is just a direct manual solving directly subtituting values in a formula with disregard to temp etc. Sorry for the incomplete information here are the goals of this: "gain of 100≤Av≤130 and ...
Lumiere's user avatar
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0 votes
1 answer
223 views

OpAmp - Open Loop, Closed Loop and Loop Gain Simulations

I would be very happy if anyone can help me to find these questions regarding the opamps. In the first picture the parameters are given as Aol = VOA/VM and 1/B = Vout/Vm. ( 1'st picture is from TI) In ...
Mhan's user avatar
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0 votes
2 answers
128 views

How to calculate receiver gain budget?

My receiver has the following system architecture: I know about the parts rules but I want to be specific because I am confused. I am using the AD831 as mixers, AD8367 as IF amplifier and LM386 as ...
zoonman's user avatar
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0 votes
1 answer
93 views

Simulating the open loop gain

My questions regarding the op amp simulation are as follow : Why do we need closed loop for DC and open loop for AC ? Why this separation? The inductor will behave like short at DC so the op amp ...
Mhan's user avatar
  • 373
0 votes
3 answers
336 views

Is this transistor amplifier with low pass filter correct? How should I measure the gain and frequency range?

My goal is a gain of 100-130 and a frequency range of 1-10 kHz.
Lumiere's user avatar
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0 votes
0 answers
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Current mirrors with the voltage amplifiers

I am having a slight confusion with the current mirrors and their use with the common emitter amplifier. I have seen that the current mirrors can be used to bias the circuits and replace the need for ...
kam1212's user avatar
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0 votes
0 answers
68 views

Calculating maximum gain of an antenna depending on a parameter

Consider an antenna that radiates in a direction for which the normalized gain is: $$G(\theta, \phi) = \cos^n(\theta),\ 0 < \theta < \frac{\pi}{2}$$ Calculate the maximum directivity as a ...
Ketterle's user avatar
2 votes
1 answer
129 views

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 ...
Thxforhelping's user avatar
0 votes
3 answers
106 views

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 ...
zsky3333's user avatar
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0 votes
1 answer
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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
lub2354's user avatar
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0 votes
1 answer
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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. ...
UnstableDynamics's user avatar
0 votes
2 answers
90 views

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?
imran muhd's user avatar
0 votes
1 answer
308 views

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 ...
Zunuran Nasrullah's user avatar
0 votes
2 answers
197 views

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:
armcc's user avatar
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2 votes
2 answers
90 views

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 = ...
Magno Grail's user avatar
1 vote
1 answer
69 views

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 ...
LK26's user avatar
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2 votes
1 answer
89 views

Translating a negative mV signal to CMOS level

I'm currently thinking of a circuit that will need to translate the output of a SIPM into a CMOS signal. And I'm looking for some input and ideas. The SIPM output signal has a rise time of ...
ulix's user avatar
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