Poul-Henning Kamp wrote:
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In message<[email protected]>, Tom Knox writes:
Starting with a hp supply this finesse regulator will really clean
up the output. http://www.wenzel.com/documents/finesse.html
I've played with that, and it can do impressive things.
However, to big caveats:
1. It's very temperature sensitive so on average you only get tens
of dB, not hundred dB damping.
2. Noise which comes in from the load gets amplified.
With some care its possible to make the emitter current of the shunt
transistor approximately PTAT so that, at least for small signals the
temperature dependence of the rejection is reduced significantly.
Its also possible to build a feedback style shunt regulator that has
considerably higher supply rejection than the Wenzel circuit using an
opamp and a shunt transistor together with a small resistance in series
with one of the supply leads.
Bruce
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