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PGA300EVM-034: the 0ohm resister on feedback loop

Part Number: PGA300EVM-034

hello 

I am try to understand the OWI circuit for my application. I find there is  a 0 ohm (R20) resister on power amplifier feedback loop. you can see the EVM board user guide page 21.

do you know what is the function of this resister? I know the capacitor (C10) is for low pass filter.

Thanks. 

Hui