Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1979-04-19
1981-07-14
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307516, 307246, 328133, H03K 526
Patent
active
042789036
ABSTRACT:
A phase comparison circuit comprises a phase difference signal producing circuit receiving a reference signal and variable frequency signal to produce a high level signal over a time period corresponding to the phase difference between both the signals, a discharge signal producing circuit for producing a high level signal a predetermined time after the high level signal of the phase difference signal producing circuit is completed, a first switching circuit connected in series with a capacitor and adapted to be closed in response to the high level signal from the phase difference signal producing circuit to enable the capacitor to be charged, a second switching circuit adapted to be closed in response to the high level signal from the discharge signal producing circuit to enable the capacitor to be discharged, a transistor having a base-to-emitter path connected to the capacitor, and a third switching circuit adapted to be closed in response to the variable frequency signal and ground the emitter of the transistor through a resistor, in which a voltage signal proportional to the phase difference between the reference signal and the variable frequency signal is produced from the emitter of the transistor.
REFERENCES:
patent: 3509476 (1970-04-01), Roth
patent: 3585508 (1971-06-01), Crowther
patent: 3714463 (1973-01-01), Laune
patent: 3721833 (1973-03-01), Kramer
patent: 3863080 (1975-01-01), Steckler
Heyman John S.
Tokyo Shibaura Denki Kabushiki Kaisha
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