What's the linear range of the power amplifiers on Sora board?
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mardi 6 mars 2012 05:12Hi, I wanna to check the linear range of the power amplifiers on Soar board, is there any way to get this range? Furthermore, if I set rxpa as 0x3000 and rxgain as 0x3E00, will the power amplifiers work in their linear range? Thanks.
Toutes les réponses
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samedi 10 mars 2012 16:00Modérateur
According to our experience in XCVR2450 or V3 radio, the RX PA (dut rxpa) and RX VGA (dut rxgain) are almost always working in their linear rang. The TX PA could be out of its linear range when the gain setting (dut txgain) is too high. To guarantee the radio channel performance, it's not suggested to use txgain higher than 0x1300.
-Jiansong
- Marqué comme réponse Jiansong zhangMicrosoft Employee, Moderator lundi 30 avril 2012 03:02
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lundi 12 mars 2012 08:42
In our Sora, the rxpa, rxgain and txgain parameters may work well some time, but may not work the next time. I'm confused and don't know why. Could you give me an advice?
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mercredi 14 mars 2012 03:29
hello, jiansong,
your reply has a problem. The proper txgain shouldn't been set higher than 0x1e00.
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jeudi 22 mars 2012 08:54Propriétaire
@ychm,
To set rxgain to 0x3e00 is way too high. Note that the rxgain controls the VGA in XCVR2450, which is not low noise. So the setting will raise the noise floor too high.
- Kun
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lundi 26 mars 2012 11:06Modérateur
Hi Albert,
Thank you for your reply. Txgain of 0x1e00 could degrade performce in some extreme case, e.g. 64QAM. According to my experience, txgain value no more than 0x1300 is safe.
-Jiansong
