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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: OKAD?
Date: Wed, 14 Sep 2016 02:14:12 -0700
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rickman <gnuarm@gmail.com> writes:
> Some people insist in referring to the delay line technique as a "ring
> oscillator".

A ring oscillator is an odd number of inverters arranged in a circle, I
thought.  So when you put in a pulse, it loops repeatedly around the
circle at a speed determined by the gate delays.  Of course you can put
taps in appropriate places to get delays.

https://en.wikipedia.org/wiki/Ring_oscillator