Polar receiver with reduced amplitude-phase distortion

摘要

A receiver includes a harmonic injection-locked oscillator, which receives an RF modulated signal and provides an output to two parallel signal paths. A fundamental injection-locked oscillator is provided on one of the signal paths. A phase discriminator detects a phase difference between signals that have passed through the first and second signal paths. At least one of the signal paths includes an amplitude limiting circuit. One or more of the signal paths may include an adjustable delay circuit.

主权项

1. An apparatus comprising:
a harmonic ILO operative to receive an RF modulated signal input and to provide a phase-compressed divided-frequency signal output; a phase discriminator having a first discriminator input and a second discriminator input, the phase discriminator being operative to provide a phase-detection output representative of a phase difference between a first signal at the first discriminator input and a second signal at the second discriminator input; a first signal path between the phase-compressed divided-frequency signal output and the first discriminator input; a fundamental ILO connected on the first signal path, the fundamental ILO being operative to receive the phase-compressed divided-frequency signal output and to provide a phase-locking signal output; a second signal path between the phase-compressed divided-frequency signal output and the second discriminator input; and an amplitude limiting circuit on at least one of the first and the second signal paths.