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AD9361 FAST AGC

Hi,

 

I am using fast AGC in a TDD burst system.

The convergence time of the AGC is too slow for my signal which is an OFDM signal with GI of 128 (convergence takes about 250-300 samples). How can I make it much faster?

 

Another problem is that if I increase the signal power up to about -50dBm then the RSSI (probably due to the AGC) jumps suddenly up to about -35dBm and the signal gets disturbed in such a way that errors start on the link. What can be the problem?

 

Thanks,

Y

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  • It will be hard to meet 2-3us convergence or lock time.

    I would recommend using Fast Lock AGC algorithm. The function calls you provided appear to be for slow AGC.

    The way to come close to meeting your specification is to run the part at maximum output data rate which in turn will maximize ClkRF at 122.88MHz. AGC is clocked by ClkRF and the faster ClkRF the faster the AGC operates.

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  • It will be hard to meet 2-3us convergence or lock time.

    I would recommend using Fast Lock AGC algorithm. The function calls you provided appear to be for slow AGC.

    The way to come close to meeting your specification is to run the part at maximum output data rate which in turn will maximize ClkRF at 122.88MHz. AGC is clocked by ClkRF and the faster ClkRF the faster the AGC operates.

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