Patent ID: 7693497

Claim:
A linear power amplifier comprising: a first loop including an input signal; a second loop in communication with the first loop including an error signal and an output signal; a spurious detection receiver having first and second independent inputs for receiving the error signal, and the output signal, and first and second outputs; and a spurious detection correlator having first and second inputs coupled to the first and second outputs of the spurious detection receiver and outputs for controlling the gain and phase of the second loop; wherein the spurious detection receiver comprises a first receiver circuit for continuously receiving the error signal, an RF switch for receiving the output signal, and a second receiver circuit coupled to an output of the RF switch; and wherein the first and second receiver circuit each comprise: a mixer having a first input for receiving an RF signal, a second input for receiving a local oscillator signal, and an output; a narrowband IF filter having an input coupled to the output of the mixer, and an output; an IF amplifier having an input coupled to the output of the narrowband IF filter, and an output; and an analog-to-digital converter having an analog input coupled to the output of the IF amplifier, and an output for providing a digital output signal.