# 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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165 views

### Opamp input offset voltage when saturation

I wonder, how to affect the input offset voltage of inverting amplifier when it's output in saturation? I'm changing gain with decreasing the value of R2. When the gain is greater than 5, output in ...
38 views

### Power Gain in a Small Signal Mosfet Circuit

let's consider this circuit, which is the equivalent of a small signal Mosfet amplifier. where RG is a gate series resistance which takes into account of the oxide leakage, and CGS and CGD are the ...
90 views

### Two-stages class AB amplifier

I'm studying the following two-stages class AB amplifier: Basically it is a standard two-stages op-amp (i.e. the cascade of a differential pair with active current mirror followed by an inverter with ...
182 views

### Integrator with DC control gain

I am analyzing the integrator circuit and I can't get from which equation can I get the frequency where there is the intersection with x axis - 1/C*R1 ? Thanks! source
154 views

### Transistor Gain Values

I am design a transistor switch circuit. Ic = 1mA-30mA Ib = 1mA Vce = 7V-18V This is the transistor which I am going to use as an NPN Switch Can someone tell me how to read the Fig 7 graph. In the ...
37 views

### Digital signal into the video cable

The input signal is simply composite sync signal, without any additional video information. It is CMOS - 0 to 5V levels. I need the same type of signal to appear in the cable along with the RGB lines. ...
103 views

### About the differential gain [duplicate]

Let's consider any circuit which contains a differential pair, for example a telescopic cascode single stage OTA: In every circuit like this one, my professor and every book compute the small signal ...
54 views

### Gain of wireless antenna? (-3, 0, 3, 6) [closed]

I read somewhere that each time the signal strength doubles, the gain in dB increases by 3. So because it says each time it doubles, it has to start from somewhere, it means 0 db should have some ...
624 views

### Working of INA826 instrumentation amplifier for Pt100 RTD

The schematic below contains an INA826 used to amplify the resistance of the Pt100 RTD across J1. Gain is set to 10 through the 5.49K ohm resistor. Is this ciruit amplifying only the voltage across ...
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### Antenna Gain Vs IP68 plastic enclossure

I would like to buy this IP68 plastic enclossure below for my electronic project: https://www.chinaenclosure.com/products/102-70-52mm-ip68-waterproof-plastic-enclosures-for-electronics-from-china-...
101 views

### Is the frequency response of a circuit only valid for steady state (phasors)?

This is my first post. I just finished a course about advanced circuit analysis techniques (the content was taken from textbooks by Sadiku, Hayt and Irwin.) As you know, phasors are used to solve ...
198 views

### To prove that Close Loop transfer function is sensitive to perturbation in H(s) but not to perturbations in G(s)

The feedback control system with high gain K is shown in figure
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### Find the total gain from the following Signal Flow Graph

The signal flow graph for a system is given in the figure. Find resultant gain.
771 views

### Relationship Between Root Locus Pole and Percent Overshoot and Gain in MATLAB

I have a peculiar confusion regarding the relationship between a closed-loop pole on a root locus plot and its gain and percent overshoot. I have found a point on the root locus plot that MATLAB ...
64 views

### Gain with inversing Op Amp on Equalizer

I know I posted a question about this circuit before, but I'm running into a problem. I know this is a terrible equalizer design but I'm trying to learn to put in use what I learnt with Op Amps and ...
32 views

### Amplifier Transfer Characteristics

In a previous question I had this as the given: The transfer characteristics of a voltage amplifier are described by the following equation: vO = F + G vI with amplifier saturation levels at ...
51 views

### Amplifier Voltage

I'm studying for my electronics exam and for this particular problem I have: Av = –85 (V/V), Ap 21 (dB) power gain, Ap = 3.41 (W/W), L+ = +9 (V), L- = -6 (V). Now the next exercise asks that: ...
340 views

### Designing a two stage differential amplifier with MOSFETS

As a part of a "Test you understanding quiz" i had yesterday at school were we tested our understanding of differential amplifiers and mosfets i came across a question that asked us to design a ...
71 views

### Terminology confusion with sensitivity used with gain

Regarding force transducers like strain gauges, the resolution is the smallest change in the load that represents a change in the output values of the measured forces and moments. The smaller the ...
45 views

### Mos circuit amplifier with multiple stages , overall gain

I have the following circuit and i am trying to find uin/vout. My thought process is that M3-M4 is a Cmos inverter so i can calculate the gain until that point as A1= -gm3(ro3//ro5) How can i find the ...
79 views

### Calculating the gain of a specific transistor amplifier circuit

NOTE: There is an error in the drawing above — C1 should be connected to the emitter, not the collector. Hi Electronics SE, hope this is the right place to ask this, if not I'll gladly take it ...
161 views

### How to calculate the maximum amplification of a transimpedance amplifier

I want to calculate the maximum amplification that I can get out of my transimpedance amplifier and I'm struggling a little bit with how to do determine this value. Is the amplification simply the ...
748 views

### Input and Output impedances of Current and Voltage Amplifiers

I read that Voltage Amplifier have high input impedance and low output impedance, and Current Amplifier have low input impedance and high output impedance. If this is true what is reason for this as I ...
236 views

### How to design voltage gain circuit?

I need to build a circuit with a DC gain of 2 for a 0-5V input, 0-10 V ouput (input will be adjustable). Current can be low since it doesn't really matter (this will be purely as a control signal). ...
61 views

### Bode diagram calculating for random frequency

The max Gain of an opamp is 100dB (=100000). I have a cutting frequency at 10 Hz and then the slope of my bode diagram decrease by -20dB/dec . I have unity gain at 1MHz. For 100 Hz its increasing by ...
101 views

### Is this way of plotting AC current gain in LTspice correct?

I want to plot the AC current gain versus the collector current in common base configuration. Ac current gain "alpha ac" for CB configuration is defined as the change occurring in collector current IC ...
60 views

### Finding out antenna gain in 3-D space (azimuth and elevation)

I found a cross-sectional view of a patch antenna's gain below. I would like to know how can I determine the antenna's gain for every azimuth and elevation angle in 3-D space?
365 views

### Gain of Non-Inverting Amplifier Does Not vary with Resistor Values

I am trying to build a non-inverting amplifier using a LM7171 op amp, and I am implementing it with potentiometers as Rf and R2 so that I can smoothly control the gain of the amplifier (and easily ...
2k views

### Single supply non-inverting amplifier using op amp

I'm working on building a distortion guitar effect pedal for an analog electronics class I'm taking. I am struggling with building an amplifying circuit using an op amp (we just began learning about ...
292 views

### What's the largest practical stable gain possible?

I have a feedback application to set the voltage of a node in which there is considerable loss in the loop. Simulations tell me that a differential voltage gain of 10000, 80dB (roughly about what you ...
46 views

### Calculating the gain of a transistor in VGA

This paper is from IEEE: The gain of the first VGA is expressed as $A_1 = \frac{gm_1 R_1}{1+gm_1 R_2+\frac{R_2}{ro_1}}$ However, I thought that since the (DC) current source at the source of ...
34 views

### Gain and output impedance in a differential amplifier

When looking at a differential amplifier: Why does gain increase when the output impedance is increased? For example, replacing a differential amplifier biased with resistors for an active load (...
920 views

### What's the actual difference between voltage gain, current gain and power gain?

Why do we intend to obtain different gains at different places? In an emitter follower for example, There's no voltage gain, but there's current gain and therefore it has power gain. Okay, how's ...
471 views

### Opamp stability given in not inverting configuration

If a datasheet (like AD828) says that an opamp is stable at Gain >2 (or reccomends to work with G>2, hence it is clearly not unity gain stable), what can we deduct about its stability in the inverting ...
84 views

### Calculating gains for Op-amps with real AC voltages

I'm a uni student trying to figure out how to calculate gains of op-amps with recorded real AC voltage inputs and outputs. We are expected to somehow know this for some post-lab work without being ...
585 views

### 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 ...
164 views

### 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 = ...
26 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, ...
132 views

### 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 ...
61 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 ...
171 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 ...
279 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 ...
90 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 ...
112 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 ...
140 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 ...
209 views

### 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 ...
82 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 ...