Voltage controlled variable capacitor

Details Voltage controlled variable capacitor Voltage controlled variable capacitor

2007-02-27

2007-02-27

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S03600C, C331S17700V, C331S167000

Reexamination Certificate

active

10964704

ABSTRACT:
To provide a voltage controlled variable capacitor which can change a capacitance value thereof in a wide controlled voltage range and control the capacitance value easily with a high precision without complicating the circuit configuration thereof, and to provide a voltage controlled variable capacitor which can change a capacitance value thereof with a good linearity. The voltage controlled varactor is configured in a manner that varactors VCk, each formed by a series connection of a fixed capacitor Ck (k=1, 2, . . . , n) and a MOS transistor Mk of N channel type, are connected in parallel. The MOS transistors M1to Mn are configured in a manner that gate widths W are same but gate lengths L1to Ln are elongated sequentially (that is, L1<L2< . . . <Ln) so that the threshold voltages thereof are differentiated from one another.

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