Oscillators – With device responsive to external physical condition – Temperature or light responsive
Patent
1997-11-25
1999-11-02
Mis, David
Oscillators
With device responsive to external physical condition
Temperature or light responsive
331 36C, 331158, 331177V, 310315, 310318, H03B 504, H03B 532, H03L 102, H03L 700
Patent
active
059778393
ABSTRACT:
A digital temperature compensation oscillator by which its AFC operation to a receive signal cannot be disturbed by temperature compensation operation. A digital temperature compensation oscillator comprises a temperature sensor, an address creating section, a ROM, latching means, and a voltage-controlled crystal oscillator. The temperature sensor produces an output signal varied according to ambient temperatures. The address creating section converts an output from the temperature sensor into a signal and then creating it as a ROM (read-only memory) address. The ROM stores a control voltage to compensate a frequency variation due to ambient temperatures of a voltage-controlled crystal oscillator. The latching means holds or passes data output from the ROM according to an external control signal. The D/A converter produces a control voltage for the voltage-controlled crystal oscillator according to the latching means. The voltage controlled crystal oscillator is fine adjusted based on two control voltages including the output signal from the D/A converter and an external analog AFC signal.
REFERENCES:
patent: 4633422 (1986-12-01), Brauer
patent: 5126699 (1992-06-01), Kabler
patent: 5760656 (1998-06-01), Sutliff et al.
Mis David
NEC Corporation
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