Question Regarding Automated AMP Frequency Response

[Giuseppe]

AMP Frequency response test

Hi Ivan, Your plot is showing 192Ksps it looks like. I took the QA403 on my desk and ran 3 sweeps, starting with 64K FFT for 48Ksps sample rate. And 96K I used a 128K FFT, and at 192K I used a 256K. For the sweeps, you can see the 48K has a bit of peak (0.01 dB at 20 kHz) and then drops off sharply. That is purely the digital filter inside the ADC. For the 96 and 192K sample rates, you can see a bit of what looks like a first order filter rolloff before the sharp drop. That is an RC in the fr…

You can see how to do the correct test recommended by Matt