RF power sensing circuit

Details RF power sensing circuit RF power sensing circuit

2011-01-11

2011-01-11

Le, Nhan (Department: 2618)

Telecommunications

Transmitter

Power control, power supply, or bias voltage supply

C455S115400, C455S333000

Reexamination Certificate

active

07869773

ABSTRACT:
The present invention provides an electronic circuit for measuring of an output power of a RF power amplifier. The electronic circuit comprises a current sensing transistor for sensing the RF current of the power amplifier and a voltage sensing module for sensing the voltage of the RF power amplifier. The electronic circuit further comprises a coherent detector for multiplying the sensed current and the sensed voltage in the time domain. In this way a signal is generated that is directly indicative of the power provided by the power amplifier irrespective of its actual load. Preferably, the coherent detector is implemented as a Gilbert quad and provides a differential output that effectively allows for DC offset compensation.

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