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xinxin
Joined: 08 Oct 2003
Posts: 234
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 15 Mar 2004 3:38 GSM PA current consumption so big ? |
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| When link to the CMU200 , the current consumption of PA is so big , it reach to morn than 1A when PCL=5. Could you help me to resolve this problem for PA design or something about the RF layout?
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rhjang
Joined: 04 Nov 2003
Posts: 29
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15 Mar 2004 9:16 Re: GSM PA current consumption so big ? |
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Hi xinxin
Does the current consumption is PA only or tranceiver included?
Maybe you can check the DC drop and APC(Vramp) value.
If you have PA's evaluation board you can check APC(Vramp) vs power.
Than compare to yours.
If DC drop too much then it need higher APC to achieve the same outpower, result in the higher current consumption.
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vfone
Joined: 10 Oct 2001
Posts: 2328
Helped: 327
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17 Mar 2004 10:24 Re: GSM PA current consumption so big ? |
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At PCL 5 (33dBm output) the current consumption during burst shall be somewhere close to 1.5A.
The PA output match shall be optimized for output power, efficiency and harmonics. Usually is a compromise between these three parameters.
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xinxin
Joined: 08 Oct 2003
Posts: 234
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23 Mar 2004 2:51 GSM PA current consumption so big ? |
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| 1.5 A is only for PA working , or for total working?
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mckinson
Joined: 03 Sep 2003
Posts: 136
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23 Mar 2004 5:05 GSM PA current consumption so big ? |
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| I think 1.5A ,only for burst
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mckinson
Joined: 03 Sep 2003
Posts: 136
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23 Mar 2004 5:09 GSM PA current consumption so big ? |
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| Resently ,I have made some matching from PA to FEM. The impedance is more closely to 50 ohms ,but the current is lager. I think the reason is that output power, efficiency and harmonicsis a compromise .
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