From: Jim Thompson
Subject: Re: circuit wanted-SQUARE PULSE GENERATOR
References: <1038144646.265208@athprx02> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
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Date: Tue, 26 Nov 2002 19:37:44 GMT
NNTP-Posting-Date: Tue, 26 Nov 2002 14:37:44 EST
Organization: Cox Communications
On Tue, 26 Nov 2002 18:31:50 -0000,
"John Jardine" ,
In Newsgroup: sci.electronics.design,
Entitled: "Re: circuit wanted-SQUARE PULSE GENERATOR",
Wrote the following:
|Jim Thompson wrote in message
|> On Tue, 26 Nov 2002 17:37:26 -0000,
|> "John Jardine" ,
|> In Newsgroup: sci.electronics.design,
|> Article: ,
|> Entitled: "Re: circuit wanted-SQUARE PULSE GENERATOR",
|> Wrote the following:
|> |Treading in *deep* water here but the solution is to stick a resistor in
|> |series with that timing cap'. The effect is to add sufficient 'pre-act'
|> |balance the accruing switch losses
|> Congratulations, John, that *is* the solution. I didn't expect such a
|> quick answer !-)
|> I can't remember the application now, but I first came upon this while
|> doing a PLL at 20MHz back in the days of TTL.
|> ...Jim Thompson
|Jim, You've just made my day ;-)
|First used in a 1MHz function gen I was playing with. Used LM301's and a
|I/2I triangle generator. Never pursued it as it disfigured my neat triangle.
Yep, it does put an ugly "hickey" in the triangle shape, but for clock
restorers, etc., where loop gain in the PLL shouldn't be wandering,
it's a godsend.
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| Jim-T@analog_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
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