From: Ron Miller (rmiller@Brocade.COM)
Date: Tue Jan 25 2000 - 18:10:12 PST
RIGHT ON CHRIS
Chris Bobek wrote:
> There's been a lot of discussion about selecting the right decoupling
> capacitor(s) for an IC. Howard Johnson's philosophy seems to say "pick
> the largest value cap(s) in the smallest smt package that you can
> reliably purchase". I tend to agree with that. However, I have an
> appnote for a PLL (f~=50Mhz) that says to use a 22uF and a 10pF to
> properly decouple the device. Instead, I'm using a 22uF and a 0.1uF in
> the smallest package I'm allowed to procure (0805). FOR THE SAME SIZE
> PACKAGE, should I change the 0.1uF to 10pF? If so, why?
> My understanding is that the inductance of the 10pF and 0.1uF is almost
> equal (because they are in the same size package). Inductance being
> equal, the larger capacitance is better because it provides a lower
> impedance to ground. Therefore, using a 10pF would not gain us anything
> except an extra part to procure in addition to our ubiquitous 0.1uF's.
> Thank you for your help/insight,
> **** To unsubscribe from si-list: send e-mail to firstname.lastname@example.org. 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
-- Ronald B. Miller _\\|//_ Signal Integrity Engineer (408)487-8017 (' 0-0 ') fax(408)487-8017 ==========0000-(_)0000=========== Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA 95131 email@example.com, firstname.lastname@example.org
**** To unsubscribe from si-list: send e-mail to email@example.com. 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 ****
This archive was generated by hypermail 2b29 : Thu Apr 20 2000 - 11:34:49 PDT