Multi-band frequency generation method and apparatus

Details Multi-band frequency generation method and apparatus Multi-band frequency generation method and apparatus

2008-06-30

2010-10-12

Pascal, Robert (Department: 2817)

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

C331S002000, C331S017000, C331S048000, C331S056000, C331S179000, C327S157000

Reexamination Certificate

active

07812679

ABSTRACT:
A frequency generation unit (FGU)100includes a plurality of selectable voltage controlled oscillators (110) whose output frequencies are chosen in relationship with a predetermined intermediate frequency (IF) and frequency divider value (M) to provide multi-band frequency generation capability in a single communication device. A programmable reference divider (104), phase detector (174) and programmable charge pump (106) take an incoming reference frequency (120) and generate a charge pump output (124) to optimize the in-band phase noise in the FGU100. A fixed loop filter (108) filters the charge pump output (124) to generate a control voltage (126) for the selectable VCOs (110). The desired frequency band is selected and enabled using control logic (128).

REFERENCES:
patent: 5686864 (1997-11-01), Martin et al.
patent: 6714765 (2004-03-01), Kimppa
patent: 6785525 (2004-08-01), Ries
patent: 6838947 (2005-01-01), Gomez
patent: 7023283 (2006-04-01), Kawasumi et al.

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