High-linearity voltage-controlled capacitor and capacitor control method thereof

Abstract

A voltage-controlled capacitor includes a first tunable capacitor positioned between a first node and a second node and configured to exhibit a first capacitance in accordance with a controlled voltage applied at the second node, and a second tunable capacitor positioned between the first node and the second node and configured to present a second capacitance in accordance with the controlled voltage, wherein each of the first tunable capacitor and the second tunable capacitor comprises a series connection of a capacitor and a varactor joined at a respective internal node that is DC (direct current) coupled to a respective bias node at which a respective bias voltage that is substantially stationary is applied.

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