Temperature compensated crystal oscillator

Details Temperature compensated crystal oscillator Temperature compensated crystal oscillator

1998-03-23

1999-11-30

Grimm, Siegfried H.

Oscillators

With outer casing or housing

331116FE, 331158, 331176, H03B 536, H03L 102

Patent

active

059949708

ABSTRACT:
A temperature compensated crystal oscillation circuit adapted to be contained within a small device package and providing an output frequency accuracy of approximately +/-2 ppm over a temperature range or less than 2 minutes per year over the temperature range. The device includes a crystal and a single integrated circuit wherein the integrated circuit has a temperature sensing circuit with a digital output, control circuitry, a memory circuit and a switched capacitor array for compensating the oscillation of the crystal oscillator over temperature.

REFERENCES:
patent: 5117206 (1992-05-01), Imamura
patent: 5204975 (1993-04-01), Shigemori
patent: 5500628 (1996-03-01), Knecht
patent: 5659270 (1997-08-01), Millen et al.
patent: 5668506 (1997-09-01), Watanabe et al.
patent: 5801594 (1998-09-01), Muto et al.

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