RF POWER DETECTION CIRCUIT WITH INSENSITIVITY TO PROCESS, TEMPERATURE AND LOAD IMPEDANCE VARIATION

摘要

A power detection circuit configured to detect an output power of a radio frequency transmitter. The power detection circuit includes a multiplier circuit configured to multiply a first differential input signal and a second differential input signal. The first differential input signal corresponds to a radio frequency signal to be amplified by the radio frequency transmitter. The second differential signal corresponds to an output signal as amplified by an amplifier of the radio frequency transmitter. A bias circuit is configured to generate a bias signal. A differential amplifier is configured to generate, based on the bias signal and the first differential signal and the second differential signal as multiplied by the multiplier circuit, an indication of the output power of the amplifier of the radio frequency transmitter.