Frequency dividing circuit, frequency dividing method and teleph

Details Frequency dividing circuit, frequency dividing method and teleph Frequency dividing circuit, frequency dividing method and teleph

1997-02-06

1999-05-25

Wambach, Margaret Rose

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Pulse multiplication or division

455 73, 455550, 455575, H03K 2100

Patent

active

059075902

ABSTRACT:
A frequency dividing circuit, which is easy to form as an IC and which offers reduction both in size and power consumption, has a register "a" for storing the difference between the denominator and the numerator of the fractional frequency dividing ratio, another register "b" for storing the numerator of the fractional frequency dividing ratio, a selector for selecting one of the registers and connecting the selected register to a computing unit, a flip-flop for picking up the output from the computing unit in timing with the signal to be frequency-divided, a comparator for comparing the value stored in the register "a" and the value held by the flip-flop, and a logical circuit for computing AND of the output from the comparator and the signal to be frequency-divided.

REFERENCES:
patent: 5295173 (1994-03-01), Takada et al.
patent: 5442774 (1995-08-01), Pickup et al.

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