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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: 216MHz oscillator
Date: Fri, 18 Oct 2002 23:34:17 GMT
NNTP-Posting-Date: Fri, 18 Oct 2002 16:34:17 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
"César Fernández" wrote:
> hello all, i have a little problem. im trying to design a crystal based
> oscillator working at 216MHz but the problem is that there is not crystals
> at that frequency. i have thought about using a lower freq crystal to design
> a circuit and to take the output to a frequency multiplier. can anybody give
> me any idea or advice? thanks very much
Divide the result by 4 to 8; select your crystal and build a good
class "C" Colpitts and use a 126MHz tank circuit at the output.
The oscillator also becomes the multiplier.
Common collector circuit; E-B is the oscillator section. Tuning and
loading at the collector will have minimal effect on the oscillator,
especially if you use a low Z tap on the collector (output) tank
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