[time-nuts] ? phase comparison or other device

Dr Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jun 30 19:41:32 EDT 2007

Chuck Harris wrote:

>> What about the power supply noise that appears at the amplifier output during saturation?
>> Power supply noise is almost always much larger than the opamp input noise.
>> A simple resistor + diode clamp in addition to the feedback clamp will 
>> easily attenuate the output noise of an opamp with diode clamps across 
>> its feedback resistor.
> The output of an opamp is always referenced to its power supply,
> regardless of the configuration.  If the power supply is noisy,
> the output is noisy.
> -Chuck Harris
Only when that opamp output is saturated.
When in linear operation the power supply rejection, at least at low 
frequency, is significant.


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