Poul-Henning Kamp wrote: > In message <494882eb-d714-49b4-a7e2-bef04509d...@deriesp.demon.nl>, Henk ten > Pi > erick writes: > >> Hi, >> >> An opto coupler seems good idea for an isolation amplifier but maybe >> not for the phase noise. >> > > Optocouplers have lousy dV/dt performance, so the jitter is > horrible. > > Not true for the higher speed optoisolators (eg Avago's HCPL9000 series) In any case its more a matter of noise to slew rate ratio.
The issue is really that the signal to noise ratio of the internal optical signal is relatively low. For better performance you need to use a higher power optical signal such as that from a single mode laser. However by the time you factor in the cost of the modulator etc its usually better to revert to a conventional design. Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
