System and method for generating local oscillator (LO)...

Details System and method for generating local oscillator (LO)... System and method for generating local oscillator (LO)...

2006-05-05

2009-10-20

Pascal, Robert (Department: 2817)

Oscillators

Polyphase output

C331S074000, C455S260000

Reexamination Certificate

active

07605669

ABSTRACT:
A system for generating local oscillator (LO) signals for a quadrature mixer includes an oscillator configured to provide a reference frequency signal, at least one frequency divider configured to divide the reference frequency signal into three offset phase signals, a first summing circuit configured to generate two nominal 90 degree offset phase signals from the three offset phase signals, and a second summing circuit configured to generate at least two amplitude-corrected 90 degree offset-phase quadrature signals.

REFERENCES:
patent: 6711395 (2004-03-01), Tonegawa et al.
patent: 6760577 (2004-07-01), Li
patent: 7130604 (2006-10-01), Wong et al.
patent: 7321268 (2008-01-01), Chang et al.
patent: 2004/0214547 (2004-10-01), Kim et al.
patent: 2005/0215223 (2005-09-01), Lin et al.
patent: 2005/0227636 (2005-10-01), Zachan et al.

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