the working scenario below:
Device : AD9363
ADC work mode: MGC
when we test noise floor without injecting tune, the valud about -93 dBm
when we inject tune @ 1430MHz (out-0f-band , signal strength about -40dBm), we got the noise floow -125 dBm meanwhile the VGA = 0x4c (the max value)
Can you help me explain how this happed? thanks very much~~~
Can you please share the spectrum capture for both the case?
What is the value of VGA when no tone is injected?
Please verify whether AGC is acting here.
Thanks PVALAVAN ~
I look up ug-570 which indicates "In situations where high power out-of-band interfering signals areoften present, it can be advantageous to split the gain table to optimize noise figure in the presence of these interferers " .
That case may be similar to I occur I think it should be LMT or ADC overload.
.But there is a problem that due to I am using MGC work mode and Control output pins which can observer LMT and ADC overload can not be present.
Is there any other way to observer LMT and ADC overload except Control output pins? Do u know other registers can observer LMT and ADC overload?
Thanks a lot
when tone is inected, the VGA value is the max (0x4c)
We are using MGC
You can check the registers 0x2B8 and 0x2B9 for LMT and ADC overload detect.
Thanks u so much ,srimoyi
May I change 0x131~133 register value when I using MGC full table mode?