Temperature compensation circuit for a crystal oscillator and as

Details Temperature compensation circuit for a crystal oscillator and as Temperature compensation circuit for a crystal oscillator and as

1996-12-17

1998-06-02

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331158, 331176, 331177V, H03L 102, H03L 500

Patent

active

057606560

ABSTRACT:
A temperature compensation circuit (10) for a crystal oscillator module (12) used in a communication device (200). An existing microcontroller (210) of the communication device (200) is used to provide temperature compensating digital data (30) for a crystal oscillator (18). In this way, the crystal oscillator module (12) does not require an on-board memory which substantially cuts costs. The temperature compensation digital data (30) is converted to a temperature compensation signal (22) in a digital-to-analog converter which controls the crystal oscillator frequency. However, typical digital-to-analog converters are driven by voltage regulators which vary over temperature. To solve this problem, the crystal oscillator module (12) includes an on-board voltage regulator (34) which supplies a characterized regulated voltage (36) to the digital-to-analog converter such that the temperature compensation signal (22) from the digital-to-analog converter is inherently corrected for voltage variations in the voltage regulator (34). This improves stability of the output frequency (20) from about 5 ppm to about 2 ppm.

REFERENCES:
patent: 4746879 (1988-05-01), Ma et al.
patent: 5081431 (1992-01-01), Kubo et al.

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