[time-nuts] opto coupler isolation?

[Henk ten Pierick]

Hi,

Thanks for the response, I did expect this.
It saves me the experiment.

henk


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:
>>
>>> 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
>
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