Re: Sine generator IC solution?

From: Fred Bloggs (nospam_at_nospam.com)
Date: 01/30/05 

Date: Sun, 30 Jan 2005 16:31:35 GMT

Spehro Pefhany wrote:

> An op-amp (or a few discrete transistors if you ignore the "IC
> solution" part of the OP's question) and a handful of passives and a
> nonlinear element of some kind (lamp, thermistor etc.) can be used to
> make a Wien bridge oscillator, probably the most easily adjustable
> sine-wave oscillator. But the specs might push the solution somewhere
> else. If you google on "Wein bridge" and "Wein bridge" (the latter
> has 3 times as many hits, though some may lead you to bridges over the
> Danube) you should get some good ideas.
>

You're not going to do much in the way of a 10:1 tuning range in Wien
bridge- fussy little high Q and amplitude unstable thing that it is.
These days the most practical and high performance approach, at these
frequencies, would be to generate a variable frequency square wave at
fundamental and 100x fundamental which are then processed by cheap
switching tracking filter.

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