Method and apparatus for temperature compensation of a reference

Details Method and apparatus for temperature compensation of a reference Method and apparatus for temperature compensation of a reference

1996-05-10

1998-04-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455264, 4551961, H04B 126

Patent

active

057405255

ABSTRACT:
A reference oscillator (118) in a communication device (100) such as a radiotelephone is controlled by temperature compensating the reference oscillator (118). At the time of manufacture, characterizing data are stored in non-volatile memory (128) in the communication device (100). When the communication device (100) is powered up, the characterizing data are read and used to provide an initial correction (206) to the output frequency of the reference oscillator (118). Subsequently, an automatic frequency control operation is performed using the RF signal received from a remote transmitter as a reference signal. A frequency correction is determined (214) in the form of a frequency step size and step direction. The output frequency of the reference oscillator is repeatedly stepped until frequency error is minimized.

REFERENCES:
patent: 4254382 (1981-03-01), Keller et al.
patent: 4921467 (1990-05-01), Lax
patent: 5081431 (1992-01-01), Kubo et al.
patent: 5113416 (1992-05-01), Lindell
patent: 5151703 (1992-09-01), Roos
patent: 5170492 (1992-12-01), Moller et al.
patent: 5357221 (1994-10-01), Matero
patent: 5473284 (1995-12-01), Jantti et al.

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