Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-12-13
1992-03-17
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307271, 307262, 331 17, H03L 700
Patent
active
050972197
ABSTRACT:
A control apparatus includes a phase comparator for generating a first control signal in accordance with the phase difference between a variable frequency signal and an input signal from the outside, a multiplier for multiplying the first control signal and a correction signal thereby to output a second control signal, a variable frequency oscillator for outputting the variable frequency signal in response to the second control signal, and a correction circuit for generating the correction signal for correcting a frequency deviation of the variable frequency signal from a predetermined value. An impedance conversion circuit which is of low input impedance and high output impedance includes a differential amplifier which is provided with a first terminal which receives a reference voltage obtained by resistors and a second terminal connected to an input terminal which receives an input current from the outside and which outputs a signal corresponding to the voltage difference between the first and second terminals. The impedance conversion circuit further includes a first current outputting circuit for outputting a current corresponding to a signal from the differential amplifier to the second terminal, and a second current outputting circuit for determining an output current against a signal from the differential amplifier and for outputting the output current to an external output terminal.
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Miller Stanley D.
Mitsubishi Denki & Kabushiki Kaisha
Tran Toan
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