Differently-tuned VCO using inductively coupled varactors

Details Differently-tuned VCO using inductively coupled varactors Differently-tuned VCO using inductively coupled varactors

2006-06-13

2006-06-13

Kinkead, Arnold (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S1170FE, C331S167000, C331S1170FE, C331S179000

Reexamination Certificate

active

07061340

ABSTRACT:
A differently-tuned voltage controlled oscillator (VCO) and its application in a multi-band VCO tuner are disclosed. In one aspect of the invention, the VCO comprises a plurality of serially connected inductive elements each including inductively coupled inductor elements, a varactor element connected in parallel with the serially connected first inductor elements and means to apply a first and second tuning voltage to elements of the varactor element. In a second aspect, the VCO further comprises a second varactor element connected in parallel with the inductive elements, and means to apply the second tuning voltage elements of the second varactor element.

REFERENCES:
patent: 6803829 (2004-10-01), Duncan et al.
Fong, N. et al., “A 1-V 3.8-5.7-GHz Wide-Band VCO with Differentially Tuned Accumulation MOS Varactors for Common-Mode Noise Rejection in CMOS SOI Technology”, IEEE Transactions on Microwave Theory and Techniques, vol. 51, No. 8, Aug. 2003, pp. 1952-1059.
Kapur and Long, “IES: Efficient Electrostatic and Electromagnetic Simulation”, IEEE Computational Science & Engineering, Oct.-Dec. 1998, pp. 60-67.
Behbahani and Abidi, “RF-CMOS Oscillators with Switched Tuning”, IEEE 1998 Custom Integrated Circuits Conference, pp. 555-558.
Levantino et al., “Frequency Dependence on Bias Current in 5-GHz CMOS VCOs: Impact on Tuning Range and Flicker Noise Upconversion”, IEEE Journal of Solid-State Circuits, vol. 37, No. 8, Aug. 2002, pp. 1003-1011.
Magierowski et al., “Differentially Tunable Varactor with Build-In Common-Mode Rejection”, 2002 IEEE, pp. I-559-I-562.
Tiebout, M, “Low-Power Low-Phase-Nose Differentially Tuned Quadrature VCO Design in Standard CMOS”, IEEE Journal of Solid-State Circuits, vol. 36, No. 7, Jul. 2001, pp. 1018-1024.

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