Frequency divider having a prescaler followed by a programmable

Details Frequency divider having a prescaler followed by a programmable Frequency divider having a prescaler followed by a programmable

1998-05-28

2000-05-23

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 1A, 331 16, 377 47, 377 48, 327115, 327117, H03K 2100

Patent

active

06066990&

ABSTRACT:
The invention relates to a frequency divider of the type comprising a prescaler followed by a programmable counter, and serving to divide by an overall division ratio D that can be written D=k.N+A. The prescaler operates with a pair of division ratios k/k+1, and includes means for changing from the higher division ratio k+1 to the lower division ratio k as a function of a modulus control signal. N is a first predetermined programmable value corresponding to the division ratio of the programmable counter. A is a second predetermined programmable value such that on being reached by the programmable counter, the prescaler receives the modulus control signal. The following is true: 0.ltoreq.A<N. According to the invention, the prescaler has at least two successive pairs of division ratios p/p+1,p+1/p+2, p+2/p+3, etc., and includes selection means for dynamically selecting one of the pairs as a function of a selection signal, the selected pair constituting the operating pair k/k+1. The selection signal depends on the overall division ratio D that the frequency divider is to apply.

REFERENCES:
patent: 4414687 (1983-11-01), Hirata
patent: 5066927 (1991-11-01), Dent
patent: 5614869 (1997-03-01), Bland
Patent Abstracts Of Japan, vol. 011, No. 343 (E-555), Nov. 10 1987 corresponding to JP 62 122421 A (Hitachi LTD; Others:01), Jun. 3 1987.
Patent Abstracts Of Japan, vol. 8, No. 181 (E-261) [1618], Aug. 21 1984 corresponding to JP 59 074734 A (Clarion K.K.), Apr. 27 1984.

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