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Questions about AD9361 AGC Fast Attack Mode

Question asked by on Jul 31, 2014
Latest reply on May 24, 2016 by tlili

As we all kown, fast attack mode is used to deal with TDD signal,suck as GSM.

I config the ad9361 using the recommended parameters, but when the GSM burst ends, the gain does not increase.

So, i connect ctrl output to watch the energy lost flag and agc state.  Then i find out that,when GSM burst ends, the energy lost flag is low,and state is always in 5.

Why could this happen?

The recommended parameters is that: when energy is below 10db for 8 samples,then gain will be unlock.