Digital phase comparator with reset

摘要: An all-channel PLL tuning system includes LOF counters, a comparator producing an equality pulse each time the count matches preselected channel number and digital phase-frequency comparing pulses with reference pulses. High speed is accomplished arranged to yield immediate correct directional information. A reset generated for every other forces have same initial phase into one of its stable states corresponding desired output condition. The information from stored proceeds at high until change in occurs, indicating that frequency has been passed. Normal operation then ensues.