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Idea for reasmpler to view high frequency waveforms on a soundcard.
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akkudakku:
Hey.
Recently I have found an article about this method of 'touching' super-fast signals with more ordinary equipment. Also as you can guess - no scope here, thats why I had the idea of designing the circuit in the first place. Idea is to sample the high speed waveform and recreate it at a lower frequency that your equipment can pick up.
Schematic's in the attachment, with simulated reconstructed sine. I used two 8 bit synchronous counters - one free running and at low repetition rate, the other a triggered single shot at high frequency.
Then I test to see if the counters became equal and from this I create my sample/hold signal.
What I see from my fun in LTspice is that for any nice accuracy I would need stupidly high clocks (we are talking 74xxx series here).
And you need a fast clock to resample fast waveforms, the count should take ~same time as a single cycle of captured waveform.

So the question is - use less bits for the counters? That will give me uglier waveforms (but can I average those to get better accuracy in the long run?). Learn VHDL and program a CPLD/FPGA?

Thanks for your thoughts :-)
NiHaoMike:
Have you considered hacking a cheap RTL-SDR for direct sampling?
akkudakku:
Didn't even occur to me I could use a software defined radio like that. Don't have the dongle, but the idea is interesting!
thinkfat:
What are you hoping to achieve with this? Resampling will just give you the low frequency components of the high frequency signal, all the high frequency stuff will necessarily be lost in the filter you need for the waveform reconstruction.

Gesendet von meinem Nokia 6.1 mit Tapatalk

jpb:
You may find this interesting:
https://www.analog.com/en/analog-dialogue/articles/turning-pc-sound-card-into-sampling-oscilloscope.html
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