Communication semiconductor integrated circuit device and a...

Details Communication semiconductor integrated circuit device and a... Communication semiconductor integrated circuit device and a...

2006-12-12

2006-12-12

Kinkead, Arnold (Department: 2817)

Oscillators

With frequency adjusting means

Step-frequency change

C331S17700V, C331S034000, C331S00100A, C455S260000, C327S156000, C327S159000, C327S160000

Reexamination Certificate

active

07148764

ABSTRACT:
In a communication semiconductor integrated circuit device, an oscillator (VCO10) of a PLL circuit can operate in a plurality of frequency bands. With a control voltage (Vc) of the oscillator fixed to a predetermined value (VDC), an oscillation frequency of the oscillator is measured for each band to be stored in a storage (18). When the PLL operates, a setting value to specify a band is compared with the measured frequency values stored in the storage. As a result of the comparison, a band to be actually used by the oscillator is determined.

REFERENCES:
patent: 4677394 (1987-06-01), Vollmer
patent: 6114920 (2000-09-01), Moon et al.
patent: 6188287 (2001-02-01), Avanic et al.
patent: 6317006 (2001-11-01), Welland et al.
patent: 1107456 (2001-06-01), None
patent: 1193875 (2002-04-01), None

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