Phase detector circuit

Details Phase detector circuit Phase detector circuit

1981-02-27

1984-03-06

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328134, 328160, H03D 1300, G01R 2500

Patent

active

044356579

ABSTRACT:
Horizontal sync signal is applied as a reference pulse signal to a first input terminal of a phase detector and is also applied as a gating pulse to a gate circuit. Output of a frequency divider which divides the frequency of the output of a VCO is applied as a comparison pulse to a second input terminal of the phase detector. In the phase detector, a phase detection pulse having a pulse width proportional to the phase difference between the reference pulse and the comparison pulse is obtained. This phase detection pulse is applied through a buffer to a gate circuit. In the gate circuit, the current path from the phase detection pulse input terminal to the output terminal is held conductive during the period of the gating pulse, and during this period an output pulse containing as a component thereof the phase detection pulse mentioned above is obtained. This output pulse is smoothed through a filter to be applied as an oscillation frequency control voltage input to the VCO.

REFERENCES:
patent: 3519841 (1970-07-01), Leinfelder
patent: 3840817 (1974-10-01), Seki
patent: 4001603 (1977-01-01), Wilcox
patent: 4093963 (1978-06-01), Uchida
patent: 4242602 (1980-12-01), Nakagawa et al.

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