Patent ID: 7528640
Filing Date: 2009-05-05
Classification: H03K,H03L

Abstract:
1. A digital pulse-width control apparatus, comprising: an input module, for regulating a clock signal to a specific period signal and a specific pulse-width signal; a digital delay locked loop, for receiving the specific period signal and generating a specific delay control code in a locked state; a plurality of programmable delay circuits, connected in series, each of the programmable delay circuits sequentially transmitting the specific pulse-width signal according to delay time determined by the specific delay control code, wherein total delay time of the programmable delay circuits is 0.5 times of a period of the specific pulse-width signal; and a pulse-width modulation module, for selecting one of output signals of the programmable delay circuits according to a pulse-width control code to function as a delay clock signal, and generating an adjustable clock signal or an anti-phase signal of the adjustable clock signal by comparing transition points of a compensated specific pulse-width signal and the delay clock signal.