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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Rise in Loop Gain (Part 2?)
All,
I am going through an older textbook and am looking at some examples regarding stability. I can successfully model the circuit in the book and get the same results as the author. In this case ...
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BJT differential amplifier: What causes common mode voltage gain?
In any normal op amp, if it was ideal it would have a gain such that the output voltage would be
However in reality this is not the case as there is a common mode voltage gain and hence in reality ...
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Shunt Shunt Feedback SImulations
I am trying to simulate the solution to an old text book example on a simple Shunt-Shunt feedback amplifier.
simulate this circuit – Schematic created using CircuitLab
The book only shows BF = ...
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17 views
Conversion Gain Definition for DSB-SC Upconversion
If I multiply a baseband signal \$A cos(C\omega t)\$ and a carrier signal \$B cos(D\omega t)\$, the result is \$\frac{AB}{2} [cos(C-D)\omega t+cos(C+D)\omega t]\$, which is a double sideband, ...
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Is it possible to change gain on Adafruit PN532
Is it possible to change the gain on an Adafruit PN532 board?
I need to LIMIT the range in order for it to NOT interfere with another PN532 installed close by.
The board is to be used with an ...
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55 views
Whats the gain of this op amp?
what i did here is take current over the 4.7 kilo ohm and since there are no other voltage input other than the one then shouldn't the Vout be 0.2127 volts? thats not possible for a non-inverting ...
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36 views
Tail resistor in differential gain
Why doesn't the tail resistor feature in the denominator for differential gain (whereas it does for common mode gain) in the differential amplifier below? (Fig 5N.28 from Learning the Art of ...
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108 views
Fitting of continuous transfer function
I measure a network's transfer function using a network analyzer and therefore have a set of complex data points, representing the network's gain and phase. I wish to fit a continuous, rational ...
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56 views
Output of AC op amp circuit has unknown superimposed signal on top of expected output signal
I am trying to find the voltage gain of a certain ideal op amp circuit with a sinusoidal input. However, when I simulate the circuit, the output shown seems to be my calculated output but with a ...
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59 views
Large dynamic range current sense 1uA - 100mA
I am looking at large dynamic circuits and came across an interesting project by ETH Zurich called the rocket logger - https://rocketlogger.ethz.ch/
I am a little confused by their current sensing ...
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1answer
87 views
Op Amp output's noise changes when the gain changes
I use Arduino DUE to generate a 100 Hz pulse.
I wanted to remove the DC value so I added a high pass filter and this is connected to the Op Amp(ADA4000-1)'s input. A RIGOL's DP832 power supply is ...
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How to calculate Op Amp's gain using Arduino's ADC
Hi, I'm feeding a 500 Hz PWM signal to the Op Amp's V_IN using Arduino DUE.
The Op Amp, which is ADA4000-2 from Analog device, is connected to +12V, -12V using an external power supply.
The power ...
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3answers
47 views
zero AC gain of CMOS inverter
Why is the following AC analysis of CMOS inverter resulted in zero AC gain (vout/vin) ?
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Gain bandwidth product of amplifier in a DC scenario
I think I have a simple (but still to me confusing) question regarding the gain bandwidth product (GBP) of an instrumentation amplifier: Datasheet (AD8237)
I have sensors that change their output ...
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How does this circuit with inverters work?
What this does this circuit do? I suspect it is an amplifier, but don't know how it amplifies.
For example Inv 5 and Inv 6 are connected in parallel with reverse sides but there is a wire between ...
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78 views
High voltage gain block
Schematic 1 shows a discrete operational amplifier which is used as a gain block to make up to 450V out of 12V. Q3 and Q4 are used to generate a current which is used by the current mirror. This is ...
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44 views
DC Gain too low at higher voltages
I am having an issue with DC gain for a non-inverting op amp circuit. All I am trying to do is double the voltage from two DAC outputs (DAC range is 0 to 5V and I want it to be ~0V to 10V). The DAC ...
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Why Im getting shifted phase in the output voltage?
Why im getting shifted phase in the output voltage in this differential amplifier?
and how can I eliminate this shifted phase?
Second question is, I need to make a gain of 50 in the amplifier below, ...
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Measure the 'gain' of this circuit
I made this schematic using Ni multisim and I got asked to find the ‘gain of this circuit using a 1v p-p 1kHz sine signal’ and I was unsure about this because I’m not sure if it means voltage gain or ...
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perceived loudness of noise vs. sine wave
I am trying to understand what gains I need to use each for a white noise generator and a pink noise generator for a human ear to perceive the loudness to be the same as it is for a 440 Hz sine wave ...
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What is the Correct method to find the poles and zeros expressions?
What is the Correct method to find the poles and zeros expressions ?
This is a replica circuit method used to calculate loop gain, please only consider the above part.
I used pspice to find the bode ...
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2answers
80 views
Controlling an output based on level of AC signal
This is my first post on this StackExchange after years of lurking, so please be gentle!
I would like to be able to enable an output (for example an LED) based upon an AC voltage from a split-core ...
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How to achieve variable gain using a micro-controller [closed]
I have a sine signal Vsignal below which is AC coupled and will be buffered by an LT1490 to the line input of a MOSFET power amplifier.
I'm able to control the frequency of the Vsignal through ...
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92 views
How can I build BJT amplifier with Vin and Vout requirements (peak to peak values)
I have been working on a project but I'm not sure if I'm complying with the requirements that I was given.
Design a BJT amplifier such that VIN=0.1 V and VOUT=5 V (peak to peak values). ...
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2answers
58 views
Is it better to control an amplitude of audio signal or gain?
I'm creating simple headphones amplifier with an opamp (basic non-inverting config with RC high-pass on NI) and I wonder, what's better - to control an amplitude of input signal, or a gain of an opamp?...
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53 views
Effect of changing current sense resistor value in amplifier circuit
I am trying to implement a current output amplifier circuit shown below. Current is measured across sense resistor Rs to adjust input voltage Vin.
Gain: G = -Iout/Vin = R2/(Gain-of-IA1*R1*RS)
The ...
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Choosing gain to get desired system response
I have to choose a gain so the step response fits a couple of criterias. The criterias are:
Maximum overshoot 20%
Settling time between 0.8s and 1.3s
Rise time between 0.8s and 1.1s
At first I tried ...
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5answers
592 views
Using an opamp with fractionnal gain with supply less than input signal
Let's say we have an AC signal that can swing from -15v to +15v max peak to peak. If I use an opamp with the power rails to -5v and +5v, can I get a non clipped output signal if I use a gain of 0.333? ...
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3answers
329 views
LM324 instrumentation amplifier gain and offset problem
I want to translate a Pt100 RTD to a 0-10V range, to be read by a PLC.
I designed a circuit (instrumentation amplifier) using the LM324 op-amp. It is powered using a single 12V supply.The resistor ...
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1answer
42 views
Receiver Antenna Gain
How is gain defined for a receiver antenna?
If we look at a radiating antenna, there is a Pin, and the gain in a particular direction would be the radiation intensity Ur, divided by the radiation ...
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52 views
Convention of closed loop gain in op-amp for inverting configuration
I tried to analyze real op-amp equations, in inverting and non-inverting configurations.
I found a reference question here in which they were calculating exactly what I wanted to do: calculating the ...
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1answer
69 views
MP111 Op-Amp: Non-linear gain at low input voltages?
I'm currently using the MP111 hybrid op-amp set up as a voltage controlled current source with a gain of 1. But what I'm finding is that at low input voltages the gain is much higher than it should ...
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yagi antenna gain formula
is there any specific formula to calculate yagi-uda antenna Gain? i know that The Gain of Yagi Antenna depends on length of antenna array and do not depend on number of directors used in the design , ...
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2answers
177 views
How to design a circuit starting from a block diagram?
I am struggling with the following self-study problem, taken from The Analysis and Design of Linear Circuits (8th edition).
There are two things that shock me from this problem.
We need to get a ...
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1answer
57 views
Vpp of oscillation of LCR circuit
Edited:
I'm having a trouble to estimate Vpp of a RCL oscillation circuit. I found a peak to peak inductor voltage (Vpp_L) varies with the different combination of LC, which makes sense because the ...
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36 views
How to calculated weighted gain of antenna?
I have this test specification for testing antennas and it defines weighted gain as follows:
The weighted gain is calculated from the transfer function (S21) using only the gain values within the ...
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51 views
Maximum mid-band gain of s.s. model MOSFET amplifier?
Schematics
I need to find the maximum possible gain for this NMOS cascode circuit.
Here is the s.s. model:
Work
I used nodal-matrix analysis (basis is KCL) to find the gain (\$A_v\$):
$$
\...
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2answers
84 views
Isolation Amplifier Gain Problem
I'm having a little trouble with an isolation amplifier. I'm using an HCPL-7800 isolation amplifier, in the circuit format provided by the manufacturer as a test circuit, and feeding it low voltage DC ...
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1answer
51 views
For a transmitting Antenna, can the gain be positive in decibel scale?
Gain in dB scale of the transmitting antenna is:
$$G=10\cdot\log \frac{P_o}{P_i}$$
The input power will always be larger than the output power. However, I see a lot of radiation pattern graphs with ...
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1answer
113 views
Output voltage in MOS cascode amplifier
I'll give a background to my main question:-
In a simple NMOS as shown, while constructing the small signal model of the MOSFET, when there is no resistance between Vdd and drain, NMOS is modeled ...
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2answers
75 views
Confusion with the gain concept of an amplifier
Before asking my question I want to briefly write about the basic meaning of the power gain.
Below is a model of an amplifier:
It shows the source input and amplifier output from left to right. ...
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1answer
171 views
Yagi Calculator vs. Bruteforced values?
I started trying to build my own Yagi. So i ran into maybe some very well known Websites that show how to do it - however, i wanted to try with some theory first, before actually attempting to build ...
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1answer
49 views
how to adjust drain bias to keep power dissipation constant (HEMT)
I am reading a chapter in a thesis about using HEMT (high electron mobility transistor) as a cryogenic amplifier. The measurement scheme is to use the gate voltage fluctuation's influence on the drain ...
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1answer
96 views
Gain of an experimental first order step response
I have a pwm driven DC motor control system with magnetic encoder that measures the output shaft speed and outputs the RPM values every 50ms over serial comms to plot a graph of RPM vs Time. The ...
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1answer
69 views
Simple OP-AMP Frequency Response
In my textbook, there are two interrelated equations.
1. wb = wt / (1 + R2/R1)
2. wb = wt / Ao
where
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1answer
58 views
High gain amplifier ADA4528
I am trying to make an amplifier which should amplify signals from at least 10uV (lower better) to around 100mV or above. The signals range from a few Hz to around 100kHz. Adjustable gain is also ...
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1answer
90 views
RF Output Power vs Antenna gain
I have a RF device which work on 2.4 GHz and Output power is 30 dBm (1 W), RF output is connected to a whip antenna (gain 2 dBi, omidirection), distance track between RF pad to antenna is kept as ...
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116 views
Maximum Gain For Chopper Stabilized Instrumentation Amp (MCP6N11)
I am using a Microchip MCP6N11 chopper stabilized instrumentation amplifier to amplify the signal from a MPX2300DT1 Wheatstone bridge pressure sensor. My schematic is attached. As shown the gain is ...
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1answer
103 views
Audio volume levelling / AGC for spectrum analyser
I'm busy building a preamp, and want to include an LED-matrix spectrum analyser on the front panel (for aesthetics, not accuracy!)
I've set up a circuit that uses a couple of MSGEQ7 chips to analyse ...
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1answer
50 views
Antenna Directivity
How to make an antenna more directive by changing its physical size/scalling?
My current approach: I should make the antenna bigger. A directivity is a Fourier transform of illumination, distribution ...
