Hi Having tried to do these measurements a lot of ways ….. the TimePod makes it *very* easy. The ability to get phase noise and ADEV “all at once” is part of it. The ability to handle a wide range of input levels with minimal degradation is a also part of the why. The software makes it easy for lazy Bob … a big plus ….
Bob > On Mar 4, 2018, at 8:32 PM, Bruce Griffiths <[email protected]> > wrote: > > Since I have a Timepod all that I'd need would be a board that had SMA inputs > and outputs with provision for an LC L network to step up the input if > necessary plus an RLC network on the output something like in the attachment. > > If one doesnt have a Timepod or equivalent a low noise phase detector will > suffice for the noisier sources. An adjustable phase shift network is > required to achieve quadrature between the LO (driven directly from the > splitter) and the RF input (driven by the DUT output). > > The required phase shift adjustment range could perhaps be reduced by using a > quadrature hybrid to split the test source instead of a standard splitter. > The output of the phase detector is low pass filtered and amplified and fed > to a high resolution ADC such as a sound card. > > Bruce > >> >> On 05 March 2018 at 13:59 Hal Murray <[email protected]> wrote: >> >> Bruce Griffiths <[email protected]> said: >> >>>> >>> If I had a suitable PCB board for it I would do the measurement >>> properly. >>> >>>> >> What would a suitable board look like and/or what sort of gear do you >> need to >> measure PN? >> >> -- >> These are my opinions. I hate spam. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > <CMOS_PN_test.PNG>_______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
