[SI-LIST] Re: Capacitors at high frequency
- From: Alvaro alkschbirs <alvaro.alkschbirs@xxxxxxxxx>
- To: Ken Cantrell <Ken.Cantrell@xxxxxxxxxxxxxxxx>
- Date: Mon, 25 Oct 2010 19:40:52 -0200
Thank you guys! I understand the diferences between signal coupling and
power decoupling.
Rgds for all,
Álvaro
On Sun, Oct 24, 2010 at 12:58 PM, Ken Cantrell <
Ken.Cantrell@xxxxxxxxxxxxxxxx> wrote:
> 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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