# Questions tagged [psd]

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### Noise floor of an unmatched resistive network thru PSD calculations

I am modeling the PSD of various loads to calculate noise floors. I have various load terminations from 25 ohms to 250 ohms. Per Johnson-Nyquist, the noise floor on a resistor when load and source are ...
• 21
42 views

### Image downsampling by a fraction

I need to downsample an image (bitmap image of a Spectrogram) by a fraction, N/D, (rational: ex 4/5). I understand that this can be done with resampling by 4 followed by decimation by 5. If this is ...
• 121
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### What is the unit of power spectral density?

I have an oscilloscope data, I did plot in time domain, so that unit is in volts (Y axis). After that I took FFT. So now what will be the unit in Y axis? If I will do 10 log 10 (y axis) can it is ...
• 39
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### What is the basic circuit to wire up a position-sensitive detector, or PSD?

I'm a software dev dabbling in electronics and I am looking into wiring up a position-sensitive detector, the Hamamatsu S3932, on a breadboard. My knowledge is quite rudimentary and my first goal is ...
• 267
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### How to convert amplitude (V) to dB (V^2/Hz or V/sqrt(Hz) or V?)

I took the FFT of a signal and am currently plotting amplitude (V) vs. frequency (Hz). I'd like to change the Y-Axis units to dB. How would I go about doing this? What would be the units? It is from ...
101 views

### What is omega supression for a lock-in amplifier?

I'm using a lock-in amplifier for PSD measurements. The lock-in amplifier has an option for omega supression (in dB.) I'm unable to find resources on the lock-in amplifier's manual or online about ...
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