Voltage-controlled oscillator, radio communication apparatus...

Details Voltage-controlled oscillator, radio communication apparatus... Voltage-controlled oscillator, radio communication apparatus...

2008-01-22

2008-01-22

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

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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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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