PHASE DISCIPLINED, DIRECT DIGITAL SYNTHESIZER BASED, COHERENT SIGNAL GENERATOR

摘要

A phase coherent signal generator apparatus is disclosed that outputs a coherent continuous phase signal that includes fast switched multiple different frequency bursts. The apparatus comprises: a clock generator including an input to receive a reference clock signal, and outputs to independently supply a master clock signal and a slave clock signal; an accumulating digital synthesizer that includes independent inputs to receive the slave clock signal, a digital frequency tune word signal, a phase tune word signal, and a reset signal, and an output that supplies a digital coherent continuous phase signal; a master digital synthesizer that includes independent inputs to receive the master clock signal and the digital frequency tune word signal, and independent outputs to supply the digital phase tune word signal and the reset signal; and a converter that receives the digital coherent continuous phase signal and supplies the coherent continuous phase signal.

主权项

1. A method for generating a coherent continuous phase signal having bursts of different frequencies, the method comprising:
providing a master clock signal to a master digital synthesizer; providing a first digital frequency tune word signal to the master digital synthesizer; providing a slave clock signal to a slave digital synthesizer; providing the first digital frequency tune word signal to the slave digital synthesizer; accumulating a phase by the slave digital synthesizer at a rate determined by the slave clock signal and the first digital frequency tune word; providing, by the slave digital synthesizer, a first digital output phase signal; providing a second digital frequency tune word to the master digital synthesizer and the slave digital synthesizer; generating, by the master digital synthesizer, a phase tune word signal based on the second digital frequency tune word and the master clock signal; receiving the phase tune word signal by the slave digital synthesizer; and providing, by the slave digital synthesizer, a second digital output phase signal based on the slave clock signal, the second digital frequency tune word, and the phase tune word.