Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1990-09-12
1992-08-04
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328134, 328155, 307516, 307262, 331 1A, H03D 1300, H03K 906
Patent
active
051362538
ABSTRACT:
A phase comparator has a switching circuit controlled by a switch signal and a phase comparing unit. The switching circuit receives a reference pulse signal having a duty ratio of 50% and a reception data signal having a duty ratio of less than 50%. One of these signals is selected by the switching circuit on the basis of control of the switch signal. The selected signal and an output signal from a voltage-controlled oscillator are supplied to the phase comparing unit. The phase comparing unit compares phases of the two signals. When the phase of the output signal from the voltage-controlled oscillator lags behind the phase of the selected reference pulse signal or reception data signal, the phase comparing unit outputs a first pulse signal, having a width corresponding to a phase difference between the two signals, for advancing the phase of the output signal from the voltage-controlled oscillator. When the phase of the output signal from the voltage-controlled oscillator leads ahead of the phase of the selected reference pulse signal or reception data signal, the phase comparator outputs a second pulse signal, having a width corresponding to a phase difference between the two signals, for delaying the phase of the output signal from the voltage-controlled oscillator.
REFERENCES:
patent: 4419629 (1983-12-01), O'Brien
patent: 4495468 (1985-01-01), Richards et al.
patent: 4521745 (1985-06-01), Falconer
patent: 4593254 (1986-06-01), Coburn
patent: 4651103 (1987-03-01), Grimes
patent: 4804928 (1989-02-01), Chloupek et al.
patent: 4853653 (1989-08-01), Maher
patent: 4942365 (1990-07-01), Satterwhite
Callahan Timothy P.
Kabushiki Kaisha Toshiba
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