Communication semiconductor integrated circuit and radio...

Details Communication semiconductor integrated circuit and radio... Communication semiconductor integrated circuit and radio...

2005-05-31

2005-05-31

Pascal, Robert (Department: 2817)

Oscillators

Plural oscillators

C455S260000, C455S316000

Reexamination Certificate

active

06900700

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 forming part of the transmission PLL circuit is configured to be operable in a plurality of bands. A circuit for measuring the oscillating frequency of the oscillator circuit forming part of the transmission PLL circuit is also used for measuring the oscillating frequency of the oscillator circuit forming part of the reception PLL circuit or for measuring the oscillating frequency of the oscillator circuit for the intermediate frequency.

REFERENCES:
patent: 4458214 (1984-07-01), Lakomy
patent: 5355098 (1994-10-01), Iwasaki
patent: 6643499 (2003-11-01), Audinot et al.
patent: 2003/0203720 (2003-10-01), Oosawa et al.
patent: 2004/0053595 (2004-03-01), Shinbo et al.
patent: 2357381 (2001-06-01), None

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