Pat.#5563605:		Precision digital pulse phase generator
INVENTORS:		McEwan; Thomas E., Livermore, CA
ASSIGNEES:		The Regents of the University of California, Oakland, CA
ISSUED:		Oct. 8, 1996
FILED:		Aug. 2, 1995
ABSTRACT: A timing generator comprises a crystal oscillator connected to provide an output reference pulse. A resistor-capacitor combination is connected to provide a variable-delay output pulse from an input connected to the crystal oscillator. A phase monitor is connected to provide duty-cycle representations of the reference and variable-delay output pulse phase. An operational amplifier drives a control voltage to the resistor-capacitor combination according to currents integrated from the phase monitor and injected into summing junctions. A digital-to-analog converter injects a control current into the summing junctions according to an input digital control code. A servo equilibrium results that provides a phase delay of the variable-delay output pulse to the output reference pulse that linearly depends on the input digital control code.