Wireless communication semiconductor integrated circuit...

Details Wireless communication semiconductor integrated circuit... Wireless communication semiconductor integrated circuit...

2008-09-09

2008-09-09

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S044000, C331S179000, C331S016000

Reexamination Certificate

active

11501778

ABSTRACT:
An RF IC in which a PLL circuit including a loop filter is incorporated into a semiconductor chip is achieved without increasing power consumption or chip size. The RF IC includes a VCO capable of switching oscillation frequency bands, a variable frequency divider, a phase comparator, and a loop filter, which are contained in the PLL loop. A discrimination circuit discriminates a lead or lag in a phase of an output signal from the variable frequency divider against a reference signal and an automatic band selecting circuit generates a signal for switching the frequency bands of the VCO based on output from the discrimination circuit. While switching the frequency bands of the VCO by means of bisection algorithm, the RF IC detects an optimum frequency band, and adds offset to it to determine a final usable frequency band.

REFERENCES:
patent: 6154095 (2000-11-01), Shigemori et al.
patent: 2002/0075080 (2002-06-01), Nelson et al.
patent: 2003/0183842 (2003-10-01), Kizer et al.
patent: 2003152535 (2003-05-01), None

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