Circuit for minimizing turn-on time of temperature compensated c

Details Circuit for minimizing turn-on time of temperature compensated c Circuit for minimizing turn-on time of temperature compensated c

1998-04-29

1999-11-02

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

331176, 331177V, H03B 532, H03L 102

Patent

active

059778407

ABSTRACT:
A temperature compensated crystal oscillator with an improved phase noise characteristic and a fast start up time includes a large time constant low-pass filter coupled to a temperature compensation circuit. At start up the low pass filter is effectively bypassed to enable the temperature compensation voltage and oscillator output frequency to settle quickly. A capacitance in the low-pass filter is precharged by a precharge circuit to match the temperature compensation voltage without disturbing the temperature compensation circuit and the concurrent settling of the oscillator. When the capacitance is fully charged, the low-pass filter is enabled without unsettling the oscillator output frequency.

REFERENCES:
patent: 3970966 (1976-07-01), Keller et al.
patent: 5389899 (1995-02-01), Yahagi et al.

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