Other Parts Discussed in Thread: AFE7900
Hello support team,
The digital gain compensation with the internal AGC mechanism take care for the compensation of External bypass gain amplifier as well internal DSA value and provide the actual LNA input amplitude at the DDC output. but my concern is about the compensation of the other external fix components.
My external chain will contain below.
RF input + Fixed low LNA (no bypass) + Bypass LNA to AFE7900 ADC input
Now , for the bypass LNA gain as well equivalent gain corresponding to internal DSA value will be compensated by internal Digital gain compensation algorithm. But as there is one more fix gain LNA , the digital gain compensation equivalent to fixed low LNA is required, So Is it possible to add this fix compensation as well.
What I am thinking is that , there will be 2 scenarios.
1st scenario : RF input (-40 dBm) + Fixed LNA (10 dB) + Bypass LNA( Enable =22.5 dB) = ADC input is -7.5 dBm , So, if I put External LNA gain setting in GUI = 32.5 dB , then the internal digital compensation algorithm will compensate for both amplifiers.
2nd Scenario : RF input ( 0 dBm) + Fixed LNA(10 dB) + Bypass LNA( bypass =-1 dB) = ADC input is 9 dBm , at this point of time, As there is not only single bypass amplifier in the input. There is a digital gain compensation required for the fixed gain of 9 dB. in this case , Is there any possible way that internal DGC can compensate for this scenario as well.
Please suggest your support and views.
