MOS varactor and voltage-controlled oscillator using the same

Details MOS varactor and voltage-controlled oscillator using the same MOS varactor and voltage-controlled oscillator using the same

2006-02-27

2008-05-06

Chang, Joseph (Department: 2817)

Oscillators

With frequency adjusting means

With voltage sensitive capacitor

C331S158000

Reexamination Certificate

active

07369008

ABSTRACT:
To provide a MOS varactor in which oscillation frequency variation is small and variation in a capacitance changing voltage is small, and a voltage-controlled oscillator using the MOS varactor, as a load capacitor of an oscillating circuit composed of a feedback resistor1, an amplifier2, and a crystal vibrator3, a variable electrostatic capacitor, which is generated between drain/source terminals and a gate terminal of each of MOS transistors5aand6aeach of which source and drain terminals are short-circuited, is connected. A bulk terminal of each of the MOS transistors5aand6ais connected to one terminal of a resistor19, a voltage is applied to the other terminal of the resistor19, the bulk terminal of each of the MOS transistors5aand6ais connected to one terminal of a capacitor20, and the other terminal of the capacitor20is grounded.

REFERENCES:
patent: 6040744 (2000-03-01), Sakurai et al.
patent: 6737929 (2004-05-01), Cui et al.
patent: 11-220329 (1999-08-01), None
patent: 2003-318417 (2003-11-01), None

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