Increase Sample Frequency Chipwhisperer


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.


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,