It depends on the exact parameters of the signal you're transmitting,
especially PAPR (Peak to Average Power Ratio). Here are some spectrum
analyzer plots for a wideband digital signal. The B210 gains are set to
78, 83 and 85. Note that a 2 dB increase from 83 to 85 causes a 10 dB
increase in IMD.
If you're serious about pre-distortion, a spectrum analyzer is highly
recommended.
Ron
gain = 78
gain78
gain = 83
gain83
gain = 85
gain85
On 10/19/21 2:09 AM, fan wrote:
Hi，everyone.I am trying to study how to pre distort the signal on b210
to eliminate the error of nonlinear PA. Before that, I need to
determine: does the TX PA of b210 have nonlinear characteristics (when
TX gain is too high, the signal amplitude will be limited below 1. Is
this becausof its nonlinearity)? If yes, what value is the TX gain set
to when TX PA is nonlinear? How do I get the output value of PA?
(connect TX port and Rx port with a SMA cable and observe the input of
RX?)
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