8 GHz Sampling Oscilloscope for experiments

A basic open-source multi-GHz sampling oscilloscope for experimenters on a budget. Still a work-in-progress, with key pieces on separate PCBs, but showing bandwidths in the 7-8 GHz range with >= 100 GSa/s equivalent-time sampling, and around 500 k comparisons/second real time. by Ted Yapo @ hackaday.io

This particular project uses a latched comparator as a voltage sampler, specifically the ADCMP582 from Analog Devices. Built on SiGe, this $20 (single-quantity) comparator has a sampling aperture of 5 ps, and a typical front-end bandwidth of 8 GHz. This ultimately limits the bandwidth of the resulting instrument, but other factors in the current design reduce the system bandwidth into the 6 GHz range. Very preliminary tests estimate the rise time of the scope to between 50 and 70 ps, corresponding to between 7 and 5 GHz bandwidth, respectively. I’m calling it 6 GHz for now, and I expect it can be improved somewhat,

8 GHz Sampling Oscilloscope for experiments – [Link]

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