Increase Sample Frequency Chipwhisperer


#1

Good morning,

I’d like to ask you a question about sample frequency in Chipwhisperer Capture tool: is there a way to change the frequency and choose other parameters instead of “x4” or “x1”? I’d like to bring the final value to x8.


#2

If you have an FPGA target then the easiest way to get a higher sampling rate is to divide down the target clock in the FPGA: the samples/second stays the same, the target clock frequency goes down => more samples per clock.

But before you go down this road, you should read Colin’s paper which shows that a high sampling rate isn’t needed when the sampling clock is synchronous with the target clock (TLDR: 1x synchronous sampling was shown to be superior to 20x asynchronous sampling!).

I’ve independently reproduced similar results.
Hope this helps,
Jean-Pierre