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[SI-LIST] Where and how the Ground Noise Come from?

From: <wenjie-jack.yu@xxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Date: Mon, 3 Feb 2003 15:22:58 +0800


Dear All,

In the Mobile Phone, we have large GND noise (about 500mV) in the GSM =
900Mhz Power level 5 (about 2Watt power from antenna). And the noise =
happened in the GSM burst.=20
But this noise decrease with the Power Amplifier Level decrease.

So I want to ask where and how this noise come? its caused by Antenna =
Mismatch? Or the Shield have some leakage?=20
And how to decrease this noise?



> Best Regards,
> Jack
>=20
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