Patent ID: 7953782
Filing Date: 2011-05-31
Classification: G06F,H03K

Abstract:
1. A digital frequency generator that produces an output frequency relative to a reference clock, a device including: a reference clock signal having cycles, a numerator accessible in memory, a denominator accessible in memory, an accumulator stage coupled to the reference clock, the numerator and the denominator, that iteratively signals a terminal condition signal and a remainder signal after a number of cycles that it would take to reach an overflow condition by repeatedly accumulating the numerator and overflowing an accumulator that has a range from zero to the denominator minus one; a selector, coupled to the terminal condition signal and the remainder signal of the accumulator stage, including a state machine and an output section, a digital to analog converter (abbreviated DAC) coupled to the value signal and the rising-or-falling signal of the selector, wherein the DAC outputs an analog signal responsive the value signal with an offset responsive to the rising-or-falling signal; a filter coupled to the analog signal, outputting a filtered analog signal; and a comparator coupled to the filtered analog signal and outputting a stream of pulses.