Polar modulation

摘要

A modulator comprises a polar generation stage that generates an amplitude and phase component of a modulation signal, a differentiator stage that generates a differentiated phase component by differentiating the phase component; and an event detection stage that detects a high bandwidth event by detecting the amplitude component and/or the differentiated phase component meeting an event criterion. An inversion stage generates a modified amplitude component by inverting the amplitude component in response to detecting the high bandwidth event. A phase offset stage generates a modified differentiated phase component by, in response to detecting the high bandwidth event, adding to the differentiated phase component a phase offset having a magnitude of 180° and a sign opposite to a sign of the differentiated phase component. Amplitude and phase modulation stages employ the modified amplitude component and the modified differentiated phase component to respectively modulate the amplitude and frequency of a carrier signal.

主权项

1. A modulator comprising:
a polar generation stage configured to generate an amplitude component and a phase component of a modulation signal; a differentiator stage configured to generate a differentiated phase component by differentiating the phase component of the modulation signal; an event detection stage configured to detect a high bandwidth event by detecting at least one of the amplitude component and the differentiated phase component meeting an event criterion; an amplitude inversion stage configured to generate a modified amplitude component by inverting the amplitude component in response to detecting the high bandwidth event; a phase offset stage configured to generate a modified differentiated phase component by, in response to detecting the high bandwidth event, adding, to the differentiated phase component, a phase offset having a magnitude of 180 degrees and a sign opposite to a sign of the differentiated phase component; an amplitude modulation stage configured to modulate the amplitude of a carrier signal responsive to the modified amplitude component; and a phase modulation stage configured to modulate the frequency of the carrier signal responsive to the modified differentiated phase component.