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From: firstname.lastname@example.org (Allan Herriman)
Subject: Re: 32.7 Khz Crystal oscillator circuit help wanted
Date: Tue, 24 Sep 2002 09:24:10 GMT
Organization: Agilent Technologies
NNTP-Posting-Date: Tue, 24 Sep 2002 09:24:12 +0000 (UTC)
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On Tue, 24 Sep 2002 10:07:06 +0100, "MNQ"
>Im looking for a good website that will show me how to design a 32.7 Khz
>oscillator. The circuit I have built oscillates at many MHz and I think its
>my resistor and cap. values being screwed up.
>I am using an inverter from a CPLD if this helps.
CPLD inverters aren't very good for making crystal oscillators. There
have been some recent threads in news:comp.arch.fpga about why you
shouldn't do this.
>I have searched Yahoo, Google and Alltheweb.com but there are many pages
>with nothing related to what I`m looking for. Can anybody recommend one?
Unless you have a very cost sensitive application, I recommend using
an oscillator package, such as this one:
Second best would be to use a gate out of an *unbuffered* CMOS gate
package to make an oscillator.
("best" = simplest to get working.)
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