Patent ID: 6995626
Filing Date: 2006-02-07
Classification: H03B,H03J

Abstract:
1. A tunable, capacitive component, comprising: a tuning input for supplying a tuning voltage; a pair of circuit nodes between which a variable capacitance resides, having a capacitance value that is a function of the tuning voltage; a pair of MOS transistors coupled to the tuning input and whose four source/drain connections are connected to one another; a first pair of two coupling capacitances connected to a respective gate connection of the first pair of MOS transistors and to a respective one of the circuit nodes; a first pair of two coupling resistors connected to a respective one of the gate connections of the first pair of MOS transistors and to a connecting node; a first reference signal input configured to supply a first reference signal for setting an operating point of the first pair of MOS transistors, the first reference signal input connected to the first pair of resistors at the connecting node or to the four source/drain connections; a second pair of MOS transistors coupled to the tuning input and whose four source/drain connections are connected to one another; a second pair of two coupling capacitances connected to a respective gate connection of the second pair of MOS transistors and to a respective one of the circuit nodes; a second pair of two coupling resistors connected to a respective one of the gate connections on the second pair of MOS transistors and to a further connecting node; and a second reference signal input configured to supply a second reference signal for setting an operating point of the second pair of MOS transistors, the second reference signal input connected to the second pair of coupling resistors at their connecting node or to the four source/drain connections of the second pair of MOS transistors.