Dual modulus counter for use in a phase locked loop
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United States of America Patent
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-
Nov 19, 1991
Grant Date -
N/A
app pub date -
Sep 6, 1990
filing date -
Sep 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a phase locked loop having a variable divider, a dual modulus counter is used to provide the variable divider with selection signals. The variable divider is capable of providing an overall division ratio in increments of one over a contiguous range of values. The dual modulus counter includes a counter, a comparator and logic gates which generate selection signals that allow the variable divider to divide an input signal by at least division ratios R1 and R2. A phase locked loop utilizing the dual modulus counter is particularly well suited for use in a digital frequency synthesizer.
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