Apparatus and method of setting variable dividing ratio and appa

Details Apparatus and method of setting variable dividing ratio and appa Apparatus and method of setting variable dividing ratio and appa

1996-03-06

1998-01-27

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 25, 375376, 377 52, 455 76, 4551832, 455260, H03K 2366, H03L 718

Patent

active

057125953

ABSTRACT:
A counter apparatus for setting a dividing ratio given as a sum of a fixed value and a variable value, including an upper-digits-setting circuit for setting upper digits of a series of digits representing the dividing ratio to upper predetermined digits, the upper digits being fixed digits composing upper digits of a series of digits representing the fixed value; an adder for adding fixed digits composing middle digits of the series of digits representing the fixed value and variable digits composing upper digits of a series of digits representing the variable value and providing an output thereof as middle digits of the series of digits representing the dividing ratio which are variable digits; a middle-digits-setting circuit for setting the middle digits of the series of digits representing the dividing ratio to middle predetermined digits; and a lower-digits-setting circuit for setting lower digits of the series of digits representing the dividing ratio to lower predetermined digits, the lower digits being variable digits composing lower digits of the series of digits representing the variable value.

REFERENCES:
patent: 4184068 (1980-01-01), Washburn
patent: 4321555 (1982-03-01), Howk et al.
patent: 5045813 (1991-09-01), Yamashita et al.

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