From: Arrigo Benedetti ([email protected])
Date: Sun Oct 31 1999 - 23:56:05 PST
Dear SI experts,
I have a question on the article posted on Dr. Johnson's web site at
http://www.sigcon.com/news/2_3.htm
entitled `Bypass Capacitor Layout'. At the end of the article
Dr. Johnson's states that since the only parameter that affects the
performance of bypass capacitors at high frequency is their parasitic
inductance, there is no point in using many small capacitors, rather
the highest value capacitor in the chosen package should be used.
Isn't this in contraddiction with the principle, also stated in the
book, that many small capacitors are a better choice since the total
parasitic inductance is lower? After the series resonant frequency
of 1/sqrt(LC) the impedance goes up with 20 dB/decade slope so the
only way to decrease it is by lowering either L or C, so both L and C
are important.
Am I missing something?
Thanks in advance,
-Arrigo
-- Dr. Arrigo Benedetti e-mail: [email protected] Caltech, MS 136-93 phone: (626) 395-3695 Pasadena, CA 91125 fax: (626) 795-8649**** To unsubscribe from si-list: send e-mail to [email protected]. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****
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