Resonant circuit and a voltage-controlled oscillator

Details Resonant circuit and a voltage-controlled oscillator Resonant circuit and a voltage-controlled oscillator

2007-02-27

2007-02-27

Kinkead, Arnold (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S179000, C331S03600C, C331S1170FE, C331S1170FE

Reexamination Certificate

active

10893955

ABSTRACT:
A voltage-controlled oscillator comprising a resonant circuit and MOS transistors which constitute a negative resistance circuit of a differential structure. The resonant circuit consists of an inductance element and a MOS variable capacitance element connected in parallel therewith. The MOS variable capacitance element is divided into plural pairs connected in parallel with each other. A voltage division circuit generates staircase different-step DC bias voltages to be applied respectively to the gates of the plural divided MOS transistors. The divided MOS variable capacitance elements have a common terminal to which a common control voltage is applied. The resonant circuit is capable of reducing a load on the control voltage generator and improving the characteristics of the voltage-controlled oscillator.

REFERENCES:
patent: 6509805 (2003-01-01), Ochiai
patent: 6906596 (2005-06-01), Kitamura et al.
patent: 6917248 (2005-07-01), Nguyen
patent: 2001/0035797 (2001-11-01), Gutierrez
patent: 2002/0014925 (2002-02-01), Ochiai
patent: 2003/0078016 (2003-04-01), Groe et al.
patent: WO 03/061108 (2003-07-01), None
patent: WO 03/075451 (2003-09-01), None
Julien Mira, et al., “Distributed MOS Varactor Biasing for VCO Gain Equalization in 0.13 μm CMOS Technology”, IEEE Radio Frequency Integrated Circuits Symposium, XP-002304724, 2004, pp. 131-134.
Francesco Svelto, et al., “A Bond-Wire Inductor-MOS Varactor VCO Tunable From 1.8 to 2.4 GHz”, IEEE Transactions on Microwave Theory and Techniques, vol. 50, No. 1, XP-001085561, Jan. 2002, pp. 403-407.

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