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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I'm designing a preamp to connect 10K load. I need 2vptp at output from an 200mVptp input. but I want these bias conditions
Need gain 0f 10. without changing dc bias conditions. what will be best solution?
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How do I calculate the gain of opamps in this circuit?
I can calculate the gain of AD8656 but can not calculate the overall output gain of this circuit. What is the method of doing the calculation?
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Design of an amplifier with emitter degeneration
I'm trying to solve a question that says to find \$gm\$ and \$R_c\$, considering a gain of 50 using a BC547b transistor. But I can't find a way to calculate these parameters with the information I ...
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Ce stage amplifier
I wanna design a ce stage amplifier with this specification :
Gain 20
Rc=10k
Max swing
The simiulation of the circuit is not the same with may calculations,
How can i solve this?
what i get from ...
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46 views
Gain with load or gain without load?
There is a problem I have been dealing with for hours.
In my Electronic 1 lecture, small signal analysis was like this:
The small signal equivalent of this circuit in my lecture notes was this:
When ...
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3answers
119 views
Why is power gain a meaningful quantity at all?
I'm quite confused at a very basic concept: power gain.
An amplifier can be said to have a power gain of x decibels. The gain of an amp in decibels is never voltage or current, it is always power. But ...
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185 views
Confused about the definition of voltage gain
I found these formulas for different gains of an amplifier/filter on logarithmic scale. The topmost is power gain, simply 10 times the logarithm of the ratio of output to input power. The next one is ...
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1answer
59 views
How to get (with a fixed range and offset) linearly proportional signal from a variable range on the input?
Ask: How to get (with a fixed range and offset) linearly proportional signal from a variable range on the input?
Conditions: There's a signal (to simplify, consider a sinusoid) with variable amplitude ...
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238 views
Switching gains on a precision operational amplifier using a microcontroller
I need to be able to switch between gain values on a precision opamp in the microvolt region using a MCU. What is the best method to do this? Noise is critical.
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Did I interpret these multisim results correctly?
From the circuit above, this is what I have to do: " Connect the circuit with R3 equal to 470 kĪ©. Set the input frequency to 100 Hz. Adjust the signal level to get an output of 5 Vp-p. Record ...
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1answer
71 views
Opamp: Compensate to achieve constant gain
I have been trying to achieve a constant gain across an LM318 opamp in a differential amplifier configuration ranging from 500Hz to about 500kHz.
The opamp has a bandwidth of 15Mhz.
Since the gain is ...
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40 views
Differentiator step response
I have one ideal and one practical differentitiator circuit in Multisim to which I am applying a positive, say 10 V step response. The output I get has a much lower settling time at final value of 0 ...
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Converting differential-current output to single-ended voltage; adjustable gain
I want to convert differential-current output of DAC2902 to single-ended voltage. Can I do it with following differential op-amp configuration at the output of the DAC?
The voltage gain is fixed = 1 ...
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Differentiator cut-off frequency
A practical differentiator has two cut-off frequency but can no longer perform differentiaiton after first cut-off. After first cut-off there is a 20db per decade gain reduction but why does this ...
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1answer
65 views
How to amplify a differential signal
Let us say I have a DAC that gives out differential signal and I want to amplify it. How can I do that?
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64 views
Open-loop frequency response for an op-amp
I want to know what is the ideal circuit to measure open-loop frequency response and why?I have seen the typical open-loop frequency response curve for an op-amp a lot of times. But when I try to plot ...
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Creating atime based heat exchanger simulation in OpenAi gym and MATLAB for the purposes of temperature control regulated flow rate in
Apparatus:
Crossflow Tube and fin HX. (liquid-to-air Intercooler),
Hot Side: Tube side, gas flowing internally
Cold Side: fin side, water flowing in crossflow
Goal:
Generate an environment in "...
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86 views
How to make sense of EIRP?
I've been introduced to the concept of equivalent isotropically radiated power (EIRP) and so far I've used it to calculate RF power density at distance of 100m radiated by a directional antenna with a ...
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How to calculate a parallel power gain?
I had once an oral exam where the teacher was asking me how to calculate the power gain in a parallel way. I am doing datacommunication/telecommunication.
In the following pictures I am sharing ...
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Transform one voltage range to another
I have a 0-12V voltage range (Vin) that I need to transform to a 100mV-900mV voltage range (Vout). The 0-12V input is fixed from another system, and my analog circuitry needs the 100mV-900mV for ...
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167 views
Cascaded BJT Amplifier Load
In my first layout, with a 9.2k load I get a gain of ~55 (20mVpp in -> ~ 1.1Vpp out).
My current understand is that if I replace the resistor load with something else that presents as 9.2k (i.e. ...
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149 views
What is the use of second transistor in this circuit?
This is probably not a good title, can you suggest me a better one?
I have this circuit above, and I am supposed to find its voltage gain \$V_{out}\over V_{in}\$. But I don't understand what use the ...
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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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62 views
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 ...
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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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154 views
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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1answer
65 views
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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101 views
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 ...
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1answer
50 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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68 views
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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59 views
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$$
and sine input signal with off-set value=...
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“Coupling” gain-setting resistors in a single-ended source, differential amplifier?
I am working on a fully differential amplifier design that receives a single-ended differential voltage from a piezo sensor.
I computed a theoretical gain and selected appropriate resistors and it ...
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1answer
59 views
Troubles with mic preamp for headphones with integrated microphone
I am designing a preamp intended to interface with a microphone in common headphones (e.g. apple earpods, or sony headphones with a microphone) which will then connect to my ADC's inputs.
I've ...
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2answers
51 views
Automatic gain controller gain action
Can you guys explain to me how the turning on of Q2 and the charging of C2 increases the vgs of the FET? An equation would be helpful.
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[op amp - Gain current source - current reference]
I have a question about the formula to consider for calculation of the gain for the electronic bellow.
Thanks for your support.
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2answers
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What are the units used in Shannon formula calculation?
I'm a CompSci student with absolutely no background in wireless communication who recently needs to do something with the Shannon formula:
$$
R = W log_2\bigg(1+\frac{P_t H^2}{N_0 W}\bigg)
$$
I need ...
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2answers
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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 =āA*Vs
The positive supply voltage ...
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1answer
56 views
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 ...
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1answer
210 views
DC Gain of the System
I'm trying to design a feedbcak loop compensator and I'm following the instructions on power supply cookbook.
Book has calculations for DC gain like equations below:
in my situation Vin: 40V-60V and ...
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2answers
68 views
Closed Loop Transfer Function - PD Control
For the following control system, I am trying to find the characteristics of the system.
I have firstly found the closed loop transfer functions \$T(s) =\frac{C(s)}{R(s)}\$ , to be:
\$G(s) =K_p(s+9)...
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1answer
114 views
LTSpice produces incorrect simulation for Class AB amplifier
I have been building a Class AB amplifier simulation using LTSpice.
While it simulates well for transient analysis (voltage gain of 0.9 at peak),
using ac analysis the the voltage gain drops to 0.268....
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0answers
45 views
Troubleshooting butterworth bandpass gain stage issues
I am having issues solving the gain stage section of my bandpass filter design. I used a multiple feedback 6th order lowpass and a 6th order sallen-key high pass to get a bandpass filter with cutoff ...
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2answers
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A question about antenna gain and signal property
I have an antenna with a somewhat constant gain "X dBi (theta, phi)" in the frequency range of interest.
With this antenna we receive a radio signal with an amplitude of "Y Volt (t)".
The signal is ...
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972 views
What does m% stand for?
What does m% mean?
Like in this datasheet from TI at the gain error graphs: http://www.ti.com/lit/ds/symlink/ina149-ep.pdf?&ts=1589388038122
Is it supposed to mean per-cent-mille (10^-5) or per-...
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1answer
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Headroom of cathodyne phase inverter (in vacuum tube amplifier)
I know that gain of cathodyne is almost 1, so if it's going to produce 12V peak output, it has to take 12V peak input.
However, if the bias is set to something like (-)1-1.5V, then peak voltage of ...
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2answers
47 views
How do I calculate the DC output of this specific low pass filter?
Hi!
I am having some trouble understanding how to calculate the DC output of this low pass filter.
Also are my calculations correcet that the transfer function of the filter is:
$$\frac{R_{\text{8}}*...
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4answers
232 views
Load line and voltage or current gain
Why does a steeper load line gives higher current gain, while a flatter line gives higher voltage gain? I read multiple tutorials where they only provide a graph without explanation and I can't ...
