All Questions
Tagged with differential gain
21
questions
1
vote
1
answer
102
views
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....
- 11
0
votes
2
answers
139
views
Problem with op amp output hitting bottom rail on output stage for DIY 3D printed strain gauge. High gain is needed
So the goal is to take our differential input from our experimental full bridge strain gauge and amplify the signal to a gain of roughly 5500. The output signal would then be going into a 12-bit ADC ...
0
votes
1
answer
133
views
How to make sense of the math behind differential opamp
My first question here!
So, I'm designing a simple fully differential amplifier. The final target will be to implement a low pass filter (but I'm not there yet). Although all seems perfectly fine in ...
2
votes
2
answers
989
views
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 ...
- 907
2
votes
1
answer
519
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 ...
0
votes
0
answers
27
views
"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 ...
- 201
3
votes
0
answers
119
views
Gain of single input differential amplifier
When performing the small signal analysis of the circuit shown below, with \$ V_{1} = V_{in} \$ and \$ V_{2} = 0 \$, and output taken from \$ V_{02}\$, I consider the small signal model for half of ...
- 33
0
votes
2
answers
389
views
Op amp output voltage swing vs noise
Staying within an op amp's specified output voltage range, how does a difference in output swing affect the op amp's noise applied to the output signal? Obviously by increasing gain, we amplify the op ...
- 1
0
votes
0
answers
163
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 ...
- 616
1
vote
1
answer
3k
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 ...
- 451
0
votes
1
answer
474
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 ...
- 137
0
votes
2
answers
73
views
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, ...
1
vote
2
answers
257
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 ...
- 127
0
votes
1
answer
157
views
Differential gain of an op-amp and feedback
In an op-amp, we know from basic electronic courses that
vo = A(v1 - v2)
Assuming large differential gain and finite output, we get that (v1-v2) is very very small, ideally zero.
In a university ...
- 616
1
vote
1
answer
93
views
Why am I getting no gain from this differential circuit?
I am having difficulty understanding why I am getting unity gain from the circuit below. Before I added the common emitter stage, there was a gain of around 150, and I wanted to add another 10 X gain ...
- 95