Re: Low distortion sine wave VCO's - state of the art?
- From: Tony Williams <tonyw@xxxxxxxxxxxxxxxxxxx>
- Date: Mon, 27 Mar 2006 07:57:54 +0100
In article <1143377965.946967.20050@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Tim Shoppa <shoppa@xxxxxxxxxxxxxxxxx> wrote:
Wien bridge oscillators can certainly meet the distortion needs,
but is there a "good" way to control the frequency (even over a
limited range) with an external voltage?
BTDT with trying to voltage control a Wien Bridge
oscillator. The initial problem to solve is that
one of the resistive elements has a CMV on it, but
the real problem is moving the frequency without
transient amplitude changes/bounces.
The underlying problem there is that rectification
of a single phase (to get a low ripple dc for the agc)
cannot be made fast enough. I have a vague memory in
one of those reader Design Ideas at that time, of
someone resorting to a complicated s/hold on Vpk to
get a fast response dc for the agc.
--
Tony Williams.
.
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