[SI-LIST] Re: Where and how the Ground Noise Come from?
- From: <wenjie-jack.yu@xxxxxxxxx>
- To: <cor.coolen@xxxxxxxxxxx>
- Date: Mon, 3 Feb 2003 18:01:20 +0800
Hi Cor Coolen,
Yes the PA ground is good. Because at first we think that may be PA is =
problem, then we soldering again. And also all other RF Perference are =
quitely Good.
B.R
Jack
-----Original Message-----
From: ext cor.coolen@xxxxxxxxxxx [mailto:cor.coolen@xxxxxxxxxxx]
Sent: 03 February, 2003 17:05
To: Yu Wenjie-Jack (NMP/Beijing)
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Where and how the Ground Noise Come from?
Hello Jack,
Did you already check if your Power Amplifier is well grounded ?
In case you have an inductance between both, I can imagine ground noice =
to occur.
Best Regards,
Cor Coolen
HW - MR
Philips Medical Systems
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Subject: [SI-LIST] =
Where and how the Ground Noise Come from? =20
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<wenjie-jack.yu@xxxxxxxx Classification: =
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Sent by: =
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si-list-bounce@freelists =
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02/03/03 08:22 AM =
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Please respond to =
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wenjie-jack.yu =
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Dear All,
In the Mobile Phone, we have large GND noise (about 500mV) in the GSM =
=3D
900Mhz Power level 5 (about 2Watt power from antenna). And the noise =3D
happened in the GSM burst.=3D20
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 =
=3D
Mismatch? Or the Shield have some leakage?=3D20
And how to decrease this noise?
> Best Regards,
> Jack
>=3D20
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