For obtaining maximum performance the voltage on this
pin can be used to set correct bias level. In a typical application this is implemented by a feedback loop. The feedback can be based on the actual supply current of the device, i.e. maintaining a fixed current level, or it can be based on the RF output power level to maintain a fixed RF power level (Automatic Level Control loop).

Свой вариант намеренно не пишу чтоб не сбивать с толку