In the spirit of voiding the warranty, physically invert the LVDS clock input and output traces at the ADS62P48 with haywire and x-acto knife; the FPGA may then not know the difference. Use it as sub-device A:AB at the full 200 Msps, then interleave the complex parts into a real stream once in GR. Anyway, thanks for the info.
Lou Matt Ettus wrote > Lou, > > Many high-speed data converters actually interleave samples from multiple > lower speed ADCs. They delay clock, rather than the signal, which is much > easier. Even then, unless the delay is perfect, you get really bad spurs. > Mismatches in delay on the order of 100 fs can be a big problem. > > So what you want to try should be possible, but the results aren't going > to > be stellar. The ADCs are set up for simultaneous sampling at 200 MHz or > 5ns. You would need to split the signal and then delay one leg by 2.5ns. > No hilbert transforms or phasing networks are required. > > You *might* also be able to get the clock generator chip to generate an > inverted clock to the 2nd ADC chip, in which case you wouldn't need the > delay. > > In both cases, you're going to need to do some FPGA work to get the > samples > lined up in the right order. > > Matt > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@ > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- View this message in context: http://gnuradio.4.n7.nabble.com/Interleaved-sampling-without-interleaved-clocks-tp60986p60993.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
