公开(公告)号：CA2489126C

公开(公告)日：2009-02-03

申请号：CA2489126

申请日：2004-12-03

Applicant: HARRIS CORP

Inventor： LUU KY THOAI ,  DUELLO WAYNE DOUGLAS

IPC: H03K7/08 ,  H03F1/02 ,  H03F3/21 ,  H04L25/49

Abstract: A pulse width modulator is presented herein and it includes a pulse width driver circuit that receives a time varying ramp signal that is modulated by a time varying analog input signal to produce a pulse width modulated drive signal comprised of turn-on pulses having widths that vary with variations in the magnitude of said input signal. A switch is turned on by each drive pulse for a time duration dependent upon the duration of each drive pulse and provides an output signal therefrom. A negative bias amplifier provides a negative bias signal that has pulsations that are synchronized with said drive pulses but of opposite phase. A combiner combines output signal with the negative bias signal to provide a combined output signal.

公开(公告)号：CA2644456A1

公开(公告)日：2007-10-25

申请号：CA2644456

申请日：2007-04-05

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY WILFRED ,  CABRERA GEORGE ,  DUELLO WAYNE DOUGLAS

IPC: H04B1/02 ,  H01Q11/12 ,  H04B1/04