TRUE RADIO FREQUENCY (RF) POWER DETECTOR

摘要

A power detector is described herein that detects a true power provided by power amplifier of an RF transmitter. The power detector may include a plurality of voltage detectors that determine one or more voltages of a power amplifier included in the RF transmitter and/or a transformer included in the RF transmitter. At least one of the voltage detectors may be coupled to a sense inductor that senses one or more magnetic fields emitted by the transformer. The at least one voltage detector coupled to the sense inductor determines the voltage induced across the sense inductor as a result of the sensed magnetic field(s). The determined voltage(s) may be used to determine the load impedance of an antenna of the RF transmitter that transmits the RF signals. The load impedance may be used to accurately measure the power regardless of any impedance mismatches between the power amplifier and the antenna.

主权项

1. A power detector, comprising:
a first voltage detector coupled to an input of a transformer that is coupled between a power amplifier and an antenna of a radio frequency (RF) transmitter and configured to determine a first voltage associated with the input of the transformer; a second voltage detector coupled to an output of the transformer, the second voltage detector being configured to determine a second voltage associated with the output of the transformer; a sense inductor-based voltage detector coupled to the transformer and configured to determine a third voltage associated with transformer; and power determination logic that is configured to determine an amount of power provided by the power amplifier based on the first voltage, the second voltage, and the third voltage.