[time-nuts] opto coupler isolation?
Henk ten Pierick
henk at deriesp.demon.nl
Sat Jan 3 22:53:44 UTC 2009
Thanks for the response, I did expect this.
It saves me the experiment.
On Jan 3, 2009, at 23:33, Bruce Griffiths wrote:
> Poul-Henning Kamp wrote:
>> In message <494882EB-D714-49B4-A7E2-
>> BEF04509D7F4 at deriesp.demon.nl>, Henk ten Pi
>> erick writes:
>>> An opto coupler seems good idea for an isolation amplifier but
>>> not for the phase noise.
>> Optocouplers have lousy dV/dt performance, so the jitter is
> Not true for the higher speed optoisolators (eg Avago's HCPL9000
> 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.
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