Prescaler circuit

Details Prescaler circuit Prescaler circuit

2007-06-19

2007-06-19

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

C327S117000

Reexamination Certificate

active

11202132

ABSTRACT:
A prescaler circuit includes: a frequency number switching part including first to sixth D-type flip-flop circuits, first and second AND circuits and first and second OR circuits; and a frequency division switching control part including a third AND circuit, a third OR circuit and first and second NOR circuits. The frequency number switching part has a function of controlling the frequency division among frequency division numbers of 1/N, 1/(N+1) and 1/(N+2) via the first and the second AND circuits by controlling modulus signals input to the first and the second NOR circuits. The frequency division switching control part has a function of controlling the frequency division between ⅛-frequency-division and 1/16-frequency-division by controlling a modulus signal input to the third AND circuit. A margin for a delay time that causes misoperation at the time of the switching of frequency division numbers can be increased.

REFERENCES:
patent: 5948046 (1999-09-01), Hagberg
patent: 6157693 (2000-12-01), Jayaraman
patent: 6163181 (2000-12-01), Nishiyama
patent: 6834094 (2004-12-01), Liu et al.
patent: 6882190 (2005-04-01), Choi et al.
patent: 62-122323 (1987-06-01), None

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