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From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: SMD Cap Test Fixture
References: <3E225B37.A41@sneakemail.com> <3E230680.firstname.lastname@example.org> <3E23128D.email@example.com>
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.
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