On 1/6/18 6:12 PM, Dana Whitlow wrote:
One point about oscillator design I've not yet seen mentioned is this: the
limiter
must not degrade the resonator Q when in action. Hence, a pair of diodes
connected in parallel back to back, across a shunt resonator, would be a bad
thing to do from the perspective of low phase noise. A differential
amplifier
that limits by running out of current on peaks, driving a shunt resonator,
is
a much better way even though one pays a price in having more transistor
noise in the circuit.
I've long wondered if a very slow AGC might avoid the nonlinear mechanisms
issue except, of course, for things happening within the AGC loop's
bandwidth.
That's the Wein bridge stabilized by a light bulb, popularized by Messrs
Hewlett and Packard a while ago.
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