[SI-LIST] : Microphonics problem.

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From: Liang, Hongbo (hliang@harris.com)
Date: Mon Feb 05 2001 - 13:42:17 PST


Hi gurus:

We met microphonics problem with our frequency source design. I think there
might be experts
out there.

Here's our situation: we have four different sources on one FR4 board. Named TX
PLL, RX PLL,
TX SYNTHESIZER, RX SYNTHESIZER. The TX and RX used different references.

We could isolate the microphonics problem with TX PLL, which is 2.6GHz. The RX
PLL uses almost the
same design as TX PLL and has no problem. Only different is the RX is 1.7GHz.
Both of them use VCO.

My question as: what's the physics behind microphonics? What're the roots of it?

Wish someone out there could enlightened me.

Best Regards,
Hongbo Liang

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