Phase locked loop circuit

Details Phase locked loop circuit Phase locked loop circuit

1975-06-23

1977-05-31

Kominski, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 1A, 331 17, H03C 306

Patent

active

040272745

ABSTRACT:
A phase locked loop circuit comprises a phase comparator having an operation range with specific limits for phase comparing. A voltage-controlled oscillator produces an output at the output of the phase locked loop. At the same time, the oscillator output is fed to the phase comparator. A detector circuit, supplied with the output of the phase comparator, detects any exceeding of a specific limit of the phase by comparing the operation range of the phase comparator with a phase deviation of the oscillator output signal fed to the phase comparator. The detector produces an output correction voltage. An adder circuit adds this output correction voltage and an output error voltage of the phase comparator and supplies the resulting added voltage, as a control voltage, to the voltage-controlled oscillator. This phase locked loop operates in a state wherein the lock range thereof has been equivalently expanded by the correction voltage.

REFERENCES:
patent: 3411103 (1968-11-01), Deman et al.
patent: 3587003 (1971-06-01), Chastagnier
patent: 3882412 (1975-05-01), Apple, Jr.

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