[time-nuts] opto coupler isolation?

Magnus Danielson magnus at rubidium.dyndns.org
Sat Jan 3 17:42:16 EST 2009


Poul-Henning Kamp skrev:
> In message <494882EB-D714-49B4-A7E2-BEF04509D7F4 at 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.
> 

Some optocouplers can be pretty good. Some even have 10s of km of pulled 
silica glas between the two sides. Some even have 1000s of km of pulled 
silica glas between them, and still have pretty OK dV/dt and noise.

The cheap onces are really lousy thought.

Cheers,
Magnus - using several opto-couplers to get the message through




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