High efficiency harmonic voltage controlled oscillator (VCO)

Details High efficiency harmonic voltage controlled oscillator (VCO) High efficiency harmonic voltage controlled oscillator (VCO)

2010-06-03

2011-12-20

Pascal, Robert (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S11300A, C331S185000

Reexamination Certificate

active

08081039

ABSTRACT:
In one embodiment, a voltage controlled oscillator (VCO) is provided. The VCO includes a tank circuit. Also, the VCO includes a first pair of transistors. The drains of the first pair of transistors are coupled to the tank circuit and the gates of the first pair of transistors are cross-coupled with the drains of the first pair of transistors. The first pair of transistors each have a first threshold voltage. The VCO further includes a second pair of transistors. The drains of the second pair of transistors are respectively coupled to the sources of the first pair of transistors and the gates of the second pair of transistors are respectively coupled to the gates of the first pair of transistors, The second pair of transistors each have a second threshold voltage higher than the first threshold voltage.

REFERENCES:
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patent: 6700451 (2004-03-01), Peckham et al.
patent: 6956443 (2005-10-01), Ruffieux
patent: 7737797 (2010-06-01), Shen
Hajimiri et al., “A General Theory of Phase Noise in Electrical Oscillators”, IEEE Journal of Solid-State Circuits, vol. 33, No. 2, Feb. 1998.
Hajimiri et al., “Corrections to a General Theory of Phase Noise in Electrical Oscillators”, IEEE Journal of Solid-State Circuits, vol. 33, No. 6, Jun. 1998.
Mazzanti et al., “Class-C Harmonic CMOS VCOs, With a General Result on Phase Noise”, IEEE Journal of Solid-State Circuits, vol. 43, No. 12, Dec. 2008.

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