Method and apparatus for polar receiver with phase-amplitude alignment

A polar receiver comprising:

• a signal input operative to receive a modulated signal having a variable phase component;
• an amplitude detection circuit operative to generate a series of digital amplitude signals representing an amplitude of the modulated signal;
• a phase detection circuit operative to generate a series of digital phase signals representing a phase of the modulated signal;
• a fractional delay filter operative to generate an aligned series of digital amplitude and digital phase signals from the received modulated signal by filtering at least one of the series of digital amplitude signals and the series of digital phase signals, the fractional delay filter having a variable delay, wherein a time delay of the at least one of the series of digital amplitude signals and series of digital phase signals is adjusted with respect to another of the series of digital amplitude and digital phase signals;
• error logic operative to determine an error value based on the aligned digital amplitude and digital phase signals;
• and
• alignment circuitry operative to adjust the variable delay based on the determined error value to further align the series of digital amplitude signals with the series of digital phase signals.