DSO Quad Frequency response application

[jpa]

@FR4NK5T3R

The idea is to inject a signal into the feedback loop of the power supply and see how the power supply responds at different frequencies therefore envestigating whether the power supply is likely to go unstable and if it is capable of responding to quickly changing load conditions. The output is a bode plot pretty much the same a you have generated except you would need to plot gains above 0dB

I think also as a precaution I would need to buffer the output signal through a high bandwidth amplifier before connecting it into my circuits to prevent overdriving the DSO Quads internal drive

So what do you think? Are you familiar with the technique and would it be easy enough to add some kind of range adjustment on the dB scale to allow for this?

Sounds interesting; I don’t have any experience in designing SMPS, though.

The DSO Quad analog inputs have some protection already built-in, so the separate buffer may not be strictly necessary.

If you are ok with rebuilding from source (should be quite easy, following the instructions in README), you can adjust the dB scale in the source code. It is in main.c, “MAX_DB”. Default value is 10, just increase it (and also MIN_DB if you want).