High frequency semiconductor integrated circuit and radio...

Details High frequency semiconductor integrated circuit and radio... High frequency semiconductor integrated circuit and radio...

2006-03-28

2006-03-28

Vo, Nguyen T. (Department: 2685)

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

C455S552100

Reexamination Certificate

active

07020444

ABSTRACT:
A communication semiconductor integrated circuit has an oscillator circuit forming part of a transmission PLL circuit fabricated on a single semiconductor chip together with an oscillator circuit forming part of a reception PLL circuit and an oscillator circuit for an intermediate frequency. The oscillator circuit for the transmission PLL circuit is configured to be operable in a plurality of bands. The communication semiconductor integrated circuit also comprises a circuit for measuring the oscillating frequency of the oscillator circuit for the transmission PLL circuit, and a storage circuit for storing the result of measurement made by the measuring circuit. A band to be used by the oscillator circuit for the transmission PLL circuit is determined based on values for setting the oscillating frequencies of the oscillator circuit forming part of the reception PLL circuit and the intermediate frequency oscillator circuit, and the result of measurement stored in the storage circuit.

REFERENCES:
patent: 4321706 (1982-03-01), Craft
patent: 4458214 (1984-07-01), Lakomy
patent: 5852784 (1998-12-01), Ito et al.
patent: 6766178 (2004-07-01), Damgaard et al.
patent: 6900700 (2005-05-01), Oosawa et al.
patent: 2357381 (2001-06-01), None

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