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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Gain equation of AD620
I have recently come across the high accuracy, resistor programmable precision monolithic instrumentation amplifier with single resistor for gain control \$R_G\$ (AD620). This IA requires only the \$...
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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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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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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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3answers
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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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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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2answers
106 views
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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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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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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48 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
536 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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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
38 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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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
65 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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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
46 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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1answer
33 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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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\$):
$$
\...
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What will be Directional antenna gain formula, encompassing all lobes?
In the attached figure, one can find the antenna gain formula. But the authors have simplified it for the main lobe only. Can someone please let me know the exact form of the following simplified ...
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About Directional Antenna, Transmit Gain, and Rician fading
In my research, I assumed a directional antenna for the indoor environment. I took the approach of considering Rician fading channel b/w Transmitter \$T_x\$ and Receiver \$R_x\$. My received power is
...
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2answers
58 views
Isolation Amplifier Gain Problem
I'm having a little trouble with an isolation amplifier. I'm using an HCPL-7800 isolation amplifier, in the circuit format provided by the manufacturer as a test circuit, and feeding it low voltage DC ...
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1answer
48 views
For a transmitting Antenna, can the gain be positive in decibel scale?
Gain in dB scale of the transmitting antenna is:
$$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
83 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
72 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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How to add a volume (gain > 1 & attenuation) before this filter circuit without changing the freq. response?
I have the following circuit which I'm about to build. It will be placed before an ADC and acts as a filter. The incoming signal is sourced from a CD player. I would like to add a circuit that ...
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1answer
134 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
47 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
67 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
59 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
51 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
66 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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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
68 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
49 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 ...
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2answers
103 views
Resistive T-network
Can someone explain to me why this negative feedback resistive T-network simulates a 10M ohm resistance ?
The overall closed loop gain is -100 because 10M/100k = 100.
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1answer
156 views
Effective area or effective aperture of antenna
The effective area simply represents how much power is captured from the plane wave and delivered by the antenna. The explanation begins oft with assumption that antennas have the same polarization.
...
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2answers
81 views
2 cascaded Transistors- where is Vout of a transistor when there is a shorted Collector Resistor?
I have circuit drawn in AC, they were 2 cascaded BJT transistors, and I have changed them to the Hybrid pi model. I wish to remove the source and load in order to write a general gain equation for ...
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2answers
87 views
Gain problem of inverting opamp
I'm implementing the circuit in the schematic on the breadboard.
Difference of inputs V1 and V2 is about 5mV.
Differential opamp has gain of 17,4
Inverting opamp has gain of 26
First problem: I ...
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Microphone sensitivity? (ECM and MEMS)
I am doing microphone project with new materials.
There are some questions about ECM and MEMS microphones.
I understand that the microphone is composed of a sensor part and a circuit part(ROIC), and ...
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2answers
86 views
why does this approach neglect the output resistance of the bjt in calculating gain?
This is the question that I would like to ask about. My question is with regards to finding Vc for question 3. This is the memo for the question:
However, I have a problem with regard to how they ...
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1answer
115 views
Using LTSpice to find the gain of NPN-PMOS folded cascode
I am trying to use LTSpice to find the gain of NPN-PMOS folded cascode.
Below is the question prompt:
In the problem, the parameter specifications are as follows:
\begin{equation}
\beta =100,\:V_A=5V\...
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1answer
45 views
gain of inverting op amp with resistor on input
I´m trying to figure out the transfer function of the attached op amp circuit. I came to the conclusion that v_out = - v_in as as the two resistors in the upper path are equally sized, and the non ...
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1answer
83 views
What kind of software I can use to plot graphics like this? And how is this plotted? [closed]
I am trying to plot the transfer function of a circuit.
What kind of software I can use to plot graphics like this, without using circuit simulation software?
I would like to understand things ...
