Temperature compensating circuit, electronic apparatus and...

Details Temperature compensating circuit, electronic apparatus and... Temperature compensating circuit, electronic apparatus and...

2006-02-21

2006-02-21

D'Agosta, Stephen (Department: 2683)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S316000, C455S196100, C455S113000, C455S071000, C331S066000, C331S070000, C331S176000

Reexamination Certificate

active

07003273

ABSTRACT:
A temperature compensating circuit is provided in a radio unit, an ambient temperature is detected by a temperature sensor of the temperature compensating circuit, the detected temperature value is supplied to a correction address storage section as an address after it is converted to a digital value, and thus a correction address corresponding to a correct temperature value obtained by correcting the detected temperature value is read out. Then, the correction address is supplied to a frequency correction data storage section to read out frequency correction data corresponding to the corrected temperature value, and the frequency correction data is converted to an analog control voltage by a D/A converter and then supplied to a variable capacitance element of a reference oscillator, thereby making it possible to correct the reference oscillation frequency according to the temperature.

REFERENCES:
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patent: 6026278 (2000-02-01), Suzuki
patent: 6226505 (2001-05-01), Uda
patent: 6278867 (2001-08-01), Northcutt et al.
patent: 4-236517 (1992-08-01), None
patent: 8-265044 (1996-10-01), None
patent: 9-307355 (1997-11-01), None
patent: 09307355 (1997-11-01), None

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