Low spurious direct digital synthesizer

Abstract

A direct digital synthesizer for generating an output signal within a frequency band. The direct digital synthesizer comprises an input section for receiving a phase differential value and generating a phase angle value. A phase-amplitude converter generates an amplitude value in response to the phase angle value. A band-shaped dither generator generates a dither value. A first combiner sums the amplitude value and the dither value to define a first combined value. A second combiner differences the amplitude value and the dither value to define a second combined value. A first digital-to-analog converter (DAC) converts the first combined value to a first analog signal. A second digital-to-analog converter (DAC) converts the second combined value to a second analog signal. An output combiner combines the first analog signal and the second analog signal to generate the output signal.

Dependencies are inferred from the claim text.