LATCH STRUCTURE, FREQUENCY DIVIDER, AND METHODS FOR OPERATING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide: a latch structure that enables transition on both rising and falling edges of an input; and a frequency divider made with such a latch structure.;SOLUTION: A latch includes three circuits. The first circuit drives a first output QB to a first level when a first input D and a first clock phase CK are both low, and to a second level when D and CK are both high, and provides high impedance (HI-Z) when different logic levels are applied to D and CK. The second circuit operates similarly to the first circuit. The third circuit maintains voltages of Q and QB when the first and second circuits provide HI-Z at Q and QB. Odd-number dividers constructed with such latches produce 50% duty cycle operation without restricting output pulse widths to integer multiples of input periods.;SELECTED DRAWING: Figure 1A;COPYRIGHT: (C)2016,JPO&INPIT