All Questions
7 questions
0
votes
0
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395
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Difference between a lock in amplifier and an oscilloscope
I'm a physics student and in my lab we are currently dealing with lock-in amplifiers.
So far the thing that I found out is that an oscilloscope displays a signal in the time domain and a lock-in ...
0
votes
1
answer
226
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Effects of increasing current on external noise and SNR for analog transmission
This is a conceptual question about long analog signal transmission exposed to capacitive coupling and EMI noise as shown in below figures:
simulate this circuit – Schematic created using ...
- 12.2k
8
votes
4
answers
6k
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How does a preamplifier improve the Signal-to-Noise Ratio (SNR)?
I'm trying to understand how a preamplifier works.
Is the noise not amplified the same amount as the signal?
If so, how is that done in the preamplifier?
- 181
6
votes
2
answers
970
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How to amplify a tiny signal riding on a large common mode square wave
I have a small signal of about 10uV-100uV riding on about 1V common mode. I have tried to depict this in the picture. I am interested in designing a board level circuit(cannot use a commercial lock-in ...
- 297
-2
votes
1
answer
1k
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Photo diode TIA
here i have designed a TIA circuit with the suitable values for the feedback resistance and feedback capacitance and using the FDS100, to achieve a bandwidth around 43 MHz, the simulation is running ...
3
votes
2
answers
2k
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How to characterize SNR for an amplifier with extreme low input signal?
Often that the OPAMP has an internal noise of 1uV. If I have an extreme high gain of 10000, the noise will be amplified up to 0.01V.
Then, when I input a very low input signal of 10uV, after amplify ...
- 137
5
votes
3
answers
2k
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How to set up an experiement to measure SNR for an EEG amplifier?
I have built an EEG amplifier with gain of 2000 and bandwith at 1~40Hz.
I use an Instrument Amplifier for pre-Amp and a non-inverting opamp as post-amp and finally bandlimit at 40Hz using a 4th-order ...
- 137