Crystal oscillator with AGC and on-chip tuning

Details Crystal oscillator with AGC and on-chip tuning Crystal oscillator with AGC and on-chip tuning

1997-10-31

2000-04-18

Kinkead, Arnold

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 66, 331116R, 331 74, 331183, 331177V, 331158, 331109, H03B 530, H03L 100

Patent

active

060520361

ABSTRACT:
A highly stable single chip crystal controlled oscillator with automatic gain control. An amplitude detector monitors the output of a crystal controlled oscillator amplifier and produces a feedback signal proportional to the output signal of the amplifier to ensure oscillation is induced at startup and that the amplitude of oscillation is limited to a preselected value during operation to conserve power consumption by the amplifier. The capacitor tank circuit connected to the input of the amplifier includes a voltage variable capacitor the voltage across which is initially established at manufacture to tune the oscillation frequency to a preselected value. The voltage across the voltage variable capacitor is also adjusted to compensate for temperature variations in the circuit.

REFERENCES:
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patent: 4028638 (1977-06-01), Towle
patent: 4272840 (1981-06-01), Morozumi et al.
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patent: 4473303 (1984-09-01), Suzuki
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patent: 4978930 (1990-12-01), Suter
patent: 5150081 (1992-09-01), Goldberg
patent: 5528201 (1996-06-01), Davis
patent: 5548252 (1996-08-01), Watanabe et al.
patent: 5608359 (1997-03-01), Knecht et al.
patent: 5801594 (1998-09-01), Muto et al.
patent: 5801596 (1998-09-01), Sakurai

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