[SI-LIST] Re: Capacitors at high frequency
- From: "Ken Cantrell" <Ken.Cantrell@xxxxxxxxxxxxxxxx>
- To: "Alvaro alkschbirs" <alvaro.alkschbirs@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Sun, 24 Oct 2010 08:58:27 -0600
Alvaro,
One is a low pass filter (power bypassing), the other is a bandbass filter
(AC coupling). The series cap and the inductance of the receiver form the
bandpass. The BP is tolerant of larger variations w.r.t. to inductance (or
capacitance), and L dI/dt noise is a second or third order effect (don't
care). Apples and oranges.
Thanks,
Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Alvaro alkschbirs
Sent: Saturday, October 23, 2010 8:33 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Capacitors at high frequency
Hi all,
I have a question about power (de)coupling and ac coupling capacitors;
Situation 1:
Thinking about capacitors at high frequency, According to what I've read,
the power supply (de)coupling discrete capacitors works until some hundred
of MHz. Above this, the inductance goes dominant and the power charge
capacity goes down.
Situation 2:
Now, thinking about this same discrete capacitor working as AC coupling on
1Gb/s or 3,125Gbp/s signals. I have done this in my projects (using 0402
capacitors) and no error have been reported at this signals.
Q1. What do you think about it ?
Q2. Why the dominant inductance is a problem in situation 1, and not for 2 ?
Thank you very much,
Álvaro Alkschbirs
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