The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: SMD Cap Test Fixture
References: <3E225B37.A41@sneakemail.com> <3E230680.email@example.com> <3E23128D.firstname.lastname@example.org>
Date: Mon, 13 Jan 2003 17:42:46 -0500
NNTP-Posting-Date: Mon, 13 Jan 2003 17:42:12 EST
Organization: Bell Sympatico
Jeff Verive wrote:
> The oscillations can come from floating inputs (a CMOS no-no), or from the
> phase lag that the negative feedback resistor adds when taken with the input
> capacitance. The 4011 has three buffer stages, each with its own
> propagation delay. If the RC phase delay mentioned above plus the total
> propagation delay adds up to 360 degrees of feedback (it will at several
> frequencies) *and* if the circuit has at least unity gain left in it at one
> of these frequencies - Voila! - you have an oscillator. Now go in a dark
> closet and curse!
Aha! Prop Delay. This didn't work when I first tried it in SPICE - I will
go back and add more delay and see what happens.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup