Frequency sweep circuit

Details Frequency sweep circuit Frequency sweep circuit

1997-01-31

1999-03-09

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375326, 375376, 329309, H03D 318, H03D 324

Patent

active

058811117

ABSTRACT:
A frequency sweep circuit including: a pull-in verification wave generator for generating a verification signal for pull-in verification; a sweep wave generator for generating a frequency sweep signal; a first adder for adding an output from the pull-in verification wave generator and an output from the sweep wave generator; a correlation determining unit for receiving a phase difference signal representing a phase difference between a received carrier wave and a recovered carrier wave, and an output from the first adder, determining presence/absence of a correlation between the phase difference signal and the output, and outputting a control signal for controlling the sweep wave generator; a second adder for adding the output from the first adder to the phase difference signal; a digital-to-analog converter for receiving an output from the second adder; a loop filter for receiving an output from the digital-to-analog converter; and a voltage-controlled oscillator for receiving an output from the loop filter and generating the recovered carrier wave.

REFERENCES:
patent: 4077016 (1978-02-01), Sanders et al.
patent: 4092606 (1978-05-01), Ryan
patent: 4853642 (1989-08-01), Otani et al.
patent: 4871973 (1989-10-01), Yoshihara
patent: 5533059 (1996-07-01), Tsuda
patent: 5621767 (1997-04-01), Brandt et al.
JAPIO abstract, JP 6-216769, Jan. (1993), AN 5-021998.

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