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From: Gary Morton
X-Mailer: Mozilla 4.78 [en] (Win98; U)
Subject: Re: 216MHz oscillator
Date: Sat, 19 Oct 2002 23:10:35 GMT
NNTP-Posting-Date: Sun, 20 Oct 2002 00:10:35 BST
Organization: blueyonder (post doesn't reflect views of blueyonder)
"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
You can make a crystal oscillator at this frequency, but the crystal
will be operating on an overtone (5th or 7th). You will need to add a LC
circuit to make sure that the circuit oscillates on the desired
Motorola make a number of ICs which have built in oscillators - MC15145
If you use a discrete transistor make sure that it has a high enough Ft.
I'm no expert but it probably needs a Ft of 1GHz or more.
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