Voltage-controlled oscillator, radio communication apparatus...

Oscillators – Solid state active element oscillator – Transistors

Reexamination Certificate

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C331S17700V, C331S179000

Reexamination Certificate

active

07321271

ABSTRACT:
A voltage-controlled oscillator having an inductor circuit, n pieces (n is two or more) of variable capacitance circuit having variable capacitance elements, negative resistance circuits, and reference voltage generation means of generating a reference voltage from a power supply voltage, and wherein a predetermined reference voltage is inputted to some terminals of the variable capacitance elements of the n pieces of variable capacitance circuit, a control voltage is inputted to the other terminals thereof, and of the variable capacitance elements of the n pieces of variable capacitance circuits, the predetermined reference voltage inputted to some terminals of the variable capacitance elements of at least two pieces of the variable capacitance circuit is different.

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patent: 6774736 (2004-08-01), Kwek et al.
patent: 6833769 (2004-12-01), Seppinen et al.
patent: 6995626 (2006-02-01), Oehm et al.
patent: 2001/0050598 (2001-12-01), Mourant et al.
patent: 2001-352218 (2001-12-01), None
B. Razavi, “Prospects of CMOS Technology-for High-Speed Optical Communication Circuits”, IEEE Journal of Solid-State Circuit, vol. 37, No. 9, Sep. 2002, pp. 1135-1144).
Jürgen Oehm, Duyen Pham-Stäbner, Linear Controlled Temperature Independent Varactor Circuitry, ESSCIRC 2000, Session C06-VCO and Resonator Techniques, Sep. 24, 2002, pp. 143-146.
Pietro Andreani and Sven Mattisson, on the use of MOS Varactors in RF VCO's, IEEE Journal of Solid-State Circuits, vol. 35, No. 6, Jun. 2000, pp. 905-910.

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