Frequency multiplier circuitry and method
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United States of America Patent
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Jul 10, 1990
Grant Date -
N/A
app pub date -
Mar 31, 1989
filing date -
Mar 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Generally there is provided circuitry and a method for frequency multiplication of a first signal source including a first counter for counting pulses from a second signal of higher frequency by counting from a loaded value and generating a circuit output each time the first counter resets. A second counter is used to count cycles of the first counter and generate a feedback signal when a predetermined number of cycles have been completed (the system multiplication factor). Calibration is achieved by comparing the end of the period of the first signal to the occurrence of a feedback signal. In response the comparision circuit causes the loaded value to be changed to thereby control the output.
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