Patent ID: 6671337
Filing Date: 2003-12-30
Classification: H04L

Abstract:
A carrier modulator comprising:a quadrature modulator configured to provide a quadrature modulated signal at a first frequency; a power amplifier providing a carrier modulator output signal at a second frequency, said power amplifier having a variable gain; a phase locked loop comprising a phase comparator and a transmit local oscillator for generating a carrier signal at said second frequency, a first input of said phase comparator being coupled to said quadrature modulator and said transmit oscillator being coupled between said phase comparator and said power amplifier, said phase locked loop further comprising a down-converter configured to down-convert said carrier modulator output signal to a feedback signal at said first frequency, said feedback signal being coupled to a second input of said phase comparator, said phase locked loop thereby replicating at said second frequency of angle information comprised in said quadrature modulated signal; and an amplitude restoration arrangement for restoring from said quadrature modulated signal and said feedback signal of amplitude information comprised in said quadrature modulated signal, said amplitude restoration arrangement providing a variable gain control signal to said power amplifier until said feedback signal becomes substantially equal to said quadrature modulated signal.