Questions tagged [noise]
Noise is an unwanted disturbance in an electrical signal. This tag is for questions about sources of noise, noise types, issues caused by electrical noise, or improving the signal-to-noise ratio of an analog circuit.
2,281 questions
-3 votes
1 answer
69 views
How are random errors (from noise) of analog computers modeled?
I believe quantum computers are a form of analog computers if an analog computer is defined as computing continuous variables. However, their errors are modeled as bit errors. I am not familiar with ...
0 votes
4 answers
140 views
Common mode signal definition: why use the arithmetic average of the two signals? Is it empirically motivated?
In a post I made the other day about common mode signal and op-amps, some exchange in the comments led me to note that the definition of \$V_{\text{CM}}\$ seemed rather arbitrary. The canonical ...
- 299
3 votes
2 answers
492 views
Op-amp output distorted after adding decoupling capacitors to ±12 V power rails (and need alternative noise filter)
I’m working on a non-inverting op-amp circuit with: AC input: 1 Vpk at 1 kHz DC offset: 2 V in series with the AC signal Gain: 3 V/V ±12 V power rails There is significant simulated noise on the ...
- 411
0 votes
1 answer
43 views
How to Interpret Noise Specifications for Certain Test Instruments
I am looking up the noise specifications of equipment for a laboratory project. While looking at precision Source-Measure Units from Keysight, I noticed that they specify "Noise (RMS) (<10 Hz)&...
- 627
0 votes
1 answer
102 views
How can I reduce noise and improve femtoampere sensitivity with the SR865A lock-in amplifier?
I'm measuring (or at least trying to) low-level currents using the SR865A lock-in amplifier. My sample produces a DC current modulated by a mechanical chopper at around 1 kHz, so the signal appears as ...
- 11
1 vote
1 answer
105 views
Combining differential high-pass Sallen-Key filter and differential amplifier into one op-amp stage?
This is a follow up of this question. I'm building a low-noise differential preamp for measuring PSU output noise with an oscilloscope. The design currently has three functional stages: Differential ...
- 2,558
2 votes
1 answer
80 views
Motchbacher sample-hold noise problem
Motchbacher has a sampling noise problem in Chapter one. I have been trying to get the solutions. Perhaps someone knows how. 1-16. The sample-hold circuit shown in Fig. PI-16 is clocked by a square ...
- 29
4 votes
1 answer
175 views
Mixed Signal PCB arrangment [closed]
I’m working on a Mixed signal project with another engineer and they have placed switch-mode power supply within 30mm to ADC. I know SMPS circuits are notorious noise generators, and ADCs are ...
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