[Boatanchors] Series or Parallel Resonant Crystal Oscillator?

Andree Knott hf-mobile at hotmail.com
Thu Jan 9 02:27:55 EST 2020


An oscillator consists of an amplifier and a feedback circuit. The crystal is an element of the frequency dependant feedback circuit. You can exchange the crystal by either a parallel or a series resonant LC circuit, which are simplified equivalent circuits for the crystal, depending upon how it is in use . You can check whether the feedback circuit does what it should with each one of both equivalent circuits, the parallel or the series type. The task of the feedback circuit is, to bring a small fraction of the amplifier's output power through a very narrow frequency "window" back to the amplifier's input. A piece of paper and a pen would be helpful making such a circuit analysis.
73 de Andy

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From: boatanchors-bounces at mailman.qth.net <boatanchors-bounces at mailman.qth.net> on behalf of David Stinson <arc5 at ix.netcom.com>
Sent: Wednesday, January 8, 2020 8:15:39 PM
To: Boatanchors at mailman <boatanchors at mailman.qth.net>; milsurplus at mailman <milsurplus at mailman.qth.net>
Subject: [Boatanchors] Series or Parallel Resonant Crystal Oscillator?

How can you tell if this oscillator is designed
for series- or parallel- resonant crystals?

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