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Subject: Re: high temp oscillator problem

Date: 06/27/01 at 11:23 PM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: high temp oscillator problem posted by Brent K. Bouws on 06/27/01 at 1:27 PM:

Hi, Brent.

It's possible that your 2N4401's amplitude limiting mechanism may be temperature sensitive. Although it may be a bit of a reach, this could cause some of the accelerated frequency drift versus temperature you describe.

In Electronic Design's column "Ideas For Design", I once published at item: "AGC Gives Top Tuning Range", ED Sept. 12, 1991, page 141, in which I used an AGC loop to amplitude limit an oscillator in this frequency range. If you can find that issue, I suggest you consider it.

If you can't find it, then let me know and I'll e-mail a scan of it to you.

Good luck.

John Dunn - President
Ambertec, Inc.
ambertec@ieee.org


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