[time-nuts] Harmonics suppression in ring oscillators
Attila Kinali
attila at kinali.ch
Sun Mar 22 14:36:30 UTC 2015
On Tue, 17 Mar 2015 11:28:59 +0100
Attila Kinali <attila at kinali.ch> wrote:
> So, how do people keep ring oscillators from oscillating at higher modes?
>
> So far, my google skills have failed me to turn up any answer.
Ok, sofar i've dug up two papers (and a comment on one) that explicitly
deal with harmonics generation in ring oscillators. One is by Sasaki [1]
and quite old the other is current enough that it seems applicable today.
Sasaki[1] argues, that process variations between transistors
will prevent harmonics in small rings (see also comments in [2]),
but cannot be prevented reliably in large rings.
Bushan and Ketchen[3] on the other hand say nothing about harmonics in long
or short rings, but say that the proper startup sequence will inject
only a single edge into the ring.
Attila Kinali
[1] "Higher Harmonic Generation in CMOS/SOS Ring Oscillators",
by Nobuo Sasaki, 1982
http://dx.doi.org/10.1109/T-ED.1982.20696
[2] "Comments on 'Higher harmonic generation in CMOS/SOS ring oscillators'",
by T.W. Huston, 1983
http://dx.doi.org/10.1109/T-ED.1983.21244
[3] "Generation, Elimination and Utilization of Harmonics in Ring Oscillators",
by Manjul Bushan, Mark B. Ketchen, 2010
http://dx.doi.org/10.1109/ICMTS.2010.5466847
--
< _av500_> phd is easy
< _av500_> getting dsl is hard
More information about the Time-nuts_lists.febo.com
mailing list