Phase error signal generator

Details Phase error signal generator Phase error signal generator

1997-03-14

1999-08-31

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 3, 327 91, G01R 2500

Patent

active

059458496

ABSTRACT:
A phase error signal generator including a phase comparator for comparing phases of two input pulse signals, change over the output polarity according to phase lead and lag between said input pulse signals, and output an electric charge proportional to a time difference between said input pulse signals, an alternating front stage capacitor for charging an electric charge according to said time difference, a base-grounded transistor of which emitter is coupled to said front stage capacitor, a rear stage capacitor coupled to the collector of said transistor, and a switch controller for biasing said transistor until the next edges arrive after detecting the edges corresponding to said two input pulse signals, wherein an integrating voltages of phase error of said two input pulse signals is obtained from said rear stage capacitor by transferring the electric charge proportional to the time difference information of each edge of the input pulse signal generated in said front stage capacitor in order.

REFERENCES:
patent: 4151473 (1979-04-01), Coleman et al.
patent: 4740940 (1988-04-01), Tanaka et al.
patent: 5157014 (1992-10-01), Saiki et al.
patent: 5331230 (1994-07-01), Ichihara

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