TUNING CONTROL SYSTEM

WIPO Patent Application WO/1997/017760

A1

A tuning mechanism is provided with a tuning circuit (1) constituted by cascade-connecting two phase shifting circuits and noninverting circuit with each other and a frequency control circuit (2) incorporating a synchronous rectifying circuit (3), a pulse converting circuit (5), a polarity judging circuit (6), and a voltage generating circuit (7). The circuit (3) rectifies the input signal of the circuit (1) synchronously with the output of the circuit (1) and the circuit (5) outputs a signal having a pulse width corresponding to the deviation (phase difference) of the frequency of the input signal from the tuning frequency of the circuit (1) based on the synchronous rectification output. The circuit (6) judges the polarity of the phase difference and the circuit (7) generates a control voltage to be applied to the circuit (1) by combining the voltage corresponding to the pulse outputted from the circuit (5) with a prescribed voltage. The circuit (1) equalizes the tuning frequency to the frequency of the input signal of the circuit (1) based on the control voltage from the circuit (2).

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IKEDA TAKESHI (JP)
OHE TADATAKA (JP)
OKAMOTO AKIRA (JP)

PCT/JP1996/001098

May 15, 1997

April 23, 1996

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IKEDA TAKESHI (JP)
OHE TADATAKA (JP)
OKAMOTO AKIRA (JP)

H03J7/04; (IPC1-7): H03J3/08; H03L7/24

JPS5660116A	1981-05-23
JPH05291945A	1993-11-05
JPS6290016A	1987-04-24
JPH0575387A	1993-03-26
JPH05183406A	1993-07-23
JPH03178205A	1991-08-02

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