Phase-locked circuit capable of being quickly put in a phase-loc

Details Phase-locked circuit capable of being quickly put in a phase-loc Phase-locked circuit capable of being quickly put in a phase-loc

1992-09-30

1994-03-01

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307262, 331 1R, 375120, H03K 513, H03K 522

Patent

active

052911446

ABSTRACT:
In a phase-locked circuit which is operable in response to an input complex signal to produce an output complex signal, a first complex multiplication is carried out between the input and the output complex signals to obtain a phase difference therebetween which appears as a complex phase difference. The complex phase difference is composed of a real part and an imaginary part which are individually allowed to pass through a low pass filter and to be supplied to a numerically controlled oscillator as a control signal. The control signal includes a frequency component even when the phase-locked circuit is put into an asynchronous state. The low pass filter may be replaced by a digital circuit comprising phase dividers.

REFERENCES:
patent: 4816775 (1989-03-01), Ryan
patent: 5119037 (1992-06-01), Ichiyoshi

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