Frequency divider having a prescaler followed by a programmable counter, and a corresponding prescaler and frequency synthesizer
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United States of America Patent
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-
May 23, 2000
Grant Date -
N/A
app pub date -
May 28, 1998
filing date -
May 29, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
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
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