Abstract: A transistor arrangement with temperature compensation is disclosed with a transistor having at least one adjustable geometric parameter. A temperature measuring means outputs a temperature-dependent signal, depending on which a control unit drives the geometric parameter of the transistor in such a way that the electrical characteristic quantities thereof are temperature-independent. The adjustable geometric parameter may be the channel width of the transistor.

Abstract: An arrangement and a method for connecting a capacitor into a circuit and disconnecting it therefrom are disclosed. The capacitor includes two capacitor elements, each with a main terminal and an auxiliary terminal. The auxiliary terminals are connected to one another at a reference node to which a control signal can be coupled as a function of the desired capacitance value. The capacitance value is tapped at the main terminals of the capacitor elements. When the capacitor is switched on, a high quality level is obtained, and when the capacitor is switched off, low parasitic capacitance components are obtained. For this reason the described arrangement is particularly suitable for use in voltage-controlled oscillators.

Abstract: A transistor arrangement with temperature compensation is disclosed with a transistor having at least one adjustable geometric parameter. A temperature measuring means outputs a temperature-dependent signal, depending on which a control unit drives the geometric parameter of the transistor in such a way that the electrical characteristic quantities thereof are temperature-independent. The adjustable geometric parameter may be the channel width of the transistor.

Abstract: A circuit arrangement for generating a reference current and also an oscillator circuit having the circuit arrangement are disclosed the arrangement includes a capacitance connected to an input of a voltage-controlled current source. Two amplifiers having different drive capabilities, between which a switching can be effected, are provided to drive the capacitance. An LC oscillator can be fed with the reference current in a current-controlled manner and at the same time in a particularly low-noise manner.

Abstract: A semiconductor component includes an insulating layer, which is configured on a semiconductor substrate and in which a capacitor structure is formed. The capacitor structure has at least two parallel metallization planes, whereby at least one of the planes is configured in a lattice and inhomogeneous structure, which are electrically connected to the first metallization plane, extended at least partially into the cavities of the latticework metallization plane.

Abstract: The invention is directed to a tunable, capacitive component that includes a pair of MOS transistors whose gate connections are connected via a respective coupling capacitance to a pair of circuit nodes between which the tuned capacitance can be tapped off. The four load connections of the MOS transistors are connected to one another. In addition, a tuning input and a reference signal input are provided that are both coupled to the transistor pair. In this arrangement, the reference signal input is designed for setting the operating point of the transistors. The tunable capacitance has a large tuning range and also a low series resistance and permits good linearity properties on account of the operating point setting. The component can be used advantageously in LC oscillators.

Abstract: A bandgap reference circuit is provided in which the conventional current loop with a current mirror for feeding a differential amplifier is replaced by a reference current that flows through a resistor connected to the bias input of the differential amplifier. In conjunction with a simpler construction and suitability for lower supply voltages, the circuit exhibits an improved supply voltage rejection PSRR over the prior art.

Abstract: An arrangement and a method for connecting a capacitor into a circuit and disconnecting it therefrom are disclosed. The capacitor includes two capacitor elements, each with a main terminal and an auxiliary terminal. The auxiliary terminals are connected to one another at a reference node to which a control signal can be coupled as a function of the desired capacitance value. The capacitance value is tapped at the main terminals of the capacitor elements. When the capacitor is switched on, a high quality level is obtained, and when the capacitor is switched off, low parasitic capacitance components are obtained. For this reason the described arrangement is particularly suitable for use in voltage-controlled oscillators.

Abstract: A bandgap reference circuit is provided in which the conventional current loop with a current mirror for feeding a differential amplifier is replaced by a reference current that flows through a resistor connected to the bias input of the differential amplifier. In conjunction with a simpler construction and suitability for lower supply voltages, the circuit exhibits an improved supply voltage rejection PSRR over the prior art.

Abstract: The invention is directed to a tunable, capacitive component that includes a pair of MOS transistors whose gate connections are connected via a respective coupling capacitance to a pair of circuit nodes between which the tuned capacitance can be tapped off. The four load connections of the MOS transistors are connected to one another. In addition, a tuning input and a reference signal input are provided that are both coupled to the transistor pair. In this arrangement, the reference signal input is designed for setting the operating point of the transistors. The tunable capacitance has a large tuning range and also a low series resistance and permits good linearity properties on account of the operating point setting. The component can be used advantageously in LC oscillators.

Abstract: A circuit arrangement for generating a reference current and also an oscillator circuit having the circuit arrangement are disclosed the arrangement includes a capacitance connected to an input of a voltage-controlled current source. Two amplifiers having different drive capabilities, between which a switching can be effected, are provided to drive the capacitance. An LC oscillator can be fed with the reference current in a current-controlled manner and at the same time in a particularly low-noise manner.