Quadrature voltage controlled oscillator

Details Quadrature voltage controlled oscillator Quadrature voltage controlled oscillator

2006-02-07

2008-05-20

Chang, Joseph (Department: 2817)

Oscillators

Polyphase output

C331S046000, C331S11300A

Reexamination Certificate

active

07375596

ABSTRACT:
A quadrature voltage controlled oscillator having low phase noise and excellent output swing characteristics includes a first voltage controlled oscillator for outputting a positive in-phase output signal and a negative in-phase output signal; a second voltage controlled oscillator for outputting a positive quadrature-phase output signal and a negative quadrature-phase output signal, the second voltage controlled oscillator having a symmetrical structure with the first voltage controlled oscillator and constituting a feedback loop together with the first voltage controlled oscillator; a first constant current source for supplying constant current to the first voltage controlled oscillator in response to the output signals; and a second constant current source for supplying constant current to the second voltage controlled oscillator in response to the output signals.

REFERENCES:
patent: 6456167 (2002-09-01), Huang
patent: 10-2004-0077304 (2004-09-01), None
Kassin, Ahmed. K.: “Tail Current Flicker Noise Reducation in LC VCO's by Complementary Switched Biasing”, Mentor Graphics, Ain Shams University, Dec. 9-11, 2003, pp. 105, Cairo, Egypt.

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