Synchronous circuit capable of properly removing in-phase noise

Details Synchronous circuit capable of properly removing in-phase noise Synchronous circuit capable of properly removing in-phase noise

1996-08-16

1998-07-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327156, 327148, 327147, 331 17, H03K 513, H03K 500

Patent

active

057810486

ABSTRACT:
The synchronous circuit has: a phase comparator for comparing a feedback signal with an input reference signal to detect a phase difference and outputting a phase difference signal corresponding to the phase difference; a charge pump for outputting charge/discharge signals on the basis of the phase difference signal output from said phase comparator; a low-pass filter for changing a charge amount accumulated in a capacitor on the basis of the charge/discharge signals output from said charge pump and outputting control signals corresponding to the charge amount as differential signals; a voltage-controlled oscillator for changing an oscillation frequency of an output on the basis of the control signals output from said low-pass filter; a frequency divider for multiplying the output from said voltage-controlled oscillator and outputting the feedback signal; and fixing means arranged on an output side of said charge pump and operated, when the phase difference between the reference signal and the feedback signal is near a dead band of said phase comparator, such that levels of the charge/discharge signals output from said charge pump are fixed at predetermined levels. According to the synchronous circuit, troubles causes by the unbalance in charge/discharge operation performed by the change pump can be prevented.

REFERENCES:
patent: 3579281 (1971-05-01), Kam
patent: 5475326 (1995-12-01), Masuda

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