Patent ID: 9491014
Filing Date: 2016-11-08
CPC Classification: H04L

Claim Text:
1. A duty modulator apparatus, comprising: a frequency divider, configured to receive an input signal having an input frequency and generate a frequency divided signal having a frequency that is less than the input frequency; switching logic configured to receive the input signal and the frequency divided signal and generate switching signals; a delay modulator configured to receive the switching signals and generate a delay modulator output signal that is high when a first node voltage is greater than a second node voltage and low otherwise; and an exclusive OR (XOR) gate configured to receive the delay modulator output signal and the frequency divided signal as its inputs and produce a duty modulated output that is high when one of its inputs is low and the other is high and low otherwise, wherein a duty ratio of the duty modulated output depends on a ratio of a slope of the first node voltage to a slope of the second node voltage.