Local oscillator for multi-band wireless communication

Oscillators – With frequency adjusting means – Step-frequency change

Reexamination Certificate

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C331S025000, C455S260000

Reexamination Certificate

active

11145252

ABSTRACT:
For use in a multi-band wireless communication system, a local oscillator includes a voltage-controlled oscillator that generates an oscillating signal in response to a control signal. A local oscillating signal generator includes buffers and frequency dividers for generating from the oscillating signal a plurality of frequency signals having different frequencies. A switching circuit selects one of the frequency signals, and a phase locked loop generates the control signal from the selected frequency signal.

REFERENCES:
patent: 5684434 (1997-11-01), Mann et al.
patent: 6072996 (2000-06-01), Smith
patent: 6388478 (2002-05-01), Mann
patent: 6608530 (2003-08-01), Green et al.
European Patent Publication No. EP1061661 to Salminen, having Publication date of Dec. 20, 2000.
Japanese Patent Publication No. 11-112333 to Akita, having Publication date of Apr. 23, 1999 (w/ English Abstract page).
Japanese Patent Publication No. 2000-124829 to Hayashibara, having Publication date of Apr. 28, 2000 (w/ English Abstract page).
Korean Patent Publication No. 1020020069948 to Ko, having Publication date of Sep. 5, 2002 (w/ English Abstract page).

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