Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2009-04-30
2011-10-04
Gannon, Levi (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S185000
Reexamination Certificate
active
08031020
ABSTRACT:
In one embodiment, the present invention includes noise reduction circuits and methods. In one embodiment, cross coupled switching transistors incorporate bias voltages between the control terminal of each transistor and the drain of the other transistor. The bias voltages increase the voltage on each transistors drain terminal and reduce noise upconversion in the system. In one embodiment, the source voltages of each transistor may be increased to linearize the circuit and further reduce noise. In another embodiment, a current is coupled to a PN junction to generate a low noise bias voltage. The bias voltage is used to bias capacitors of a selectively activated and deactivated capacitance to reduce noise. Features and advantages of the present invention may be implemented in an oscillator circuit, which may be used in a communication system, for example.
REFERENCES:
patent: 6091307 (2000-07-01), Nelson
patent: 6680655 (2004-01-01), Rogers
patent: 6867658 (2005-03-01), Sibrai et al.
patent: 7116183 (2006-10-01), Wu
patent: 7199698 (2007-04-01), Goldfarb
patent: 7336138 (2008-02-01), Kitamura et al.
Cousinard David
Moser Michel
Tu Cao-Thong
Gannon Levi
Marvell International Ltd.
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