Digital phase-locked loop circuit
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United States of America Patent
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-
Nov 29, 1983
Grant Date -
N/A
app pub date -
Mar 10, 1981
filing date -
Mar 10, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital phase-locked loop consisting of a digital phase detector for detecting the phase differences between the output and the input frequency signals, a microprocessor programmed to perform both the functions of the loop filter and the phase shifter, and a binary rate multiplier to perform the function of voltage-to-frequency conversion is disclosed. A more precise frequency resolution is obtained by use of the binary rate multiplier and a further reduction in circuit complexity is achieved by removal of the phase shifter circuit in favor of the microprocessor programming.
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