[SI-LIST] Re: Power supply filtering
- From: Val Mandrusov <valman@xxxxxxxxx>
- To: whizplayer@xxxxxxxxx
- Date: Thu, 01 Aug 2002 16:16:03 -0700
Bob,
Combination or some of the items below will help you:
1. Separate Digital and Analog power/ground section of PCB (make a moat
trough all layers);
2. Place Analog and Digital PCB components separately;
3. Don't use switching power converter for Analog circuitry (use a linear one);
4. Use CM choke instead of ferrite bead;
5. Separate the Analog and Digital DC Current routing from the power supply
source;
6. Use an impedance (R,L,C, Tx) if you need to run traces across the moat.
Best Regards,
At 14:24 01.08.2002 -0700, Bob Patel wrote:
>Hi!
>I had a question for filtering power to an analog
>section from Digital VCC by using ferrite bead
>approach.
>The analog power is for a the circuit whose max.
>switching freq. might not exceed 20MHz (E1
>application). Also this ferrite bead has curent limit
>to 300ma, now if the circuit draws more than 300ma ,
>then the voltage will start dropping at the input of
>the circuit. Hence cannot use ferrite beads.
>So, how do I filter the analog supply from the digital
>supply?
>Thanks
>Bob
>
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Val Mandrusov
Sr. Compliance Enginneer
CISCO Systems, Inc
375 East Tasman Drive
San Jose, CA 95134
M/S SJ-06/04
408-853-7415 Phone
408-853-3872 FAX
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