Abstract: A model network of a nonlinear circuitry includes one or more static nonlinear elements and a plurality of linear filters with transfer functions. A method for determining the model network includes performing an input amplitude-to-output amplitude measurement of the nonlinear circuitry and performing an input amplitude-to-output phase measurement of the nonlinear circuitry. The transfer functions are calculated on the basis of results of the input amplitude-to-output amplitude measurement and input amplitude-to-output phase measurement.

Abstract: A signal is modulated by generating a pulse-width modulation signal and applying the pulse-width modulation signal to an input of a switched-mode amplifier. An output of the amplifier is coupled to a filter operable to impart either differential mode oscillations or common mode oscillations at the amplifier output based on the duty cycle of the pulse-width modulation signal. The duty cycle of the pulse-width modulation signal is varied to impart amplitude modulations at the amplifier output.

Abstract: A model network of a nonlinear circuitry includes one or more static nonlinear elements and a plurality of linear filters with transfer functions. A method for determining the model network includes performing an input amplitude-to-output amplitude measurement of the nonlinear circuitry and performing an input amplitude-to-output phase measurement of the nonlinear circuitry. The transfer functions are calculated on the basis of results of the input amplitude-to-output amplitude measurement and input amplitude-to-output phase measurement.

Abstract: In one embodiment, a circuit comprises an adaptive predistorter and a nonlinear element coupled to an output of the predistorter. The predistorter is operative to predistort an input signal according to predistortion control parameters at a given sampling rate. The circuit further comprises an identification unit and a translation unit. The identification unit identifies nonlinearity parameters representing the nonlinearity of the nonlinear element by sampling the output of the nonlinear element at an identification sampling rate lower than twice a bandwidth at the output of the nonlinear element. The translation unit translates the identified nonlinearity parameters into the predistortion control parameters. Other systems and methods are disclosed.

Abstract: One embodiment of the present invention is a method for producing a system for describing an electrical network. An output signal of the electrical network is sampled at a frequency that corresponds to the Nyquist criterion for the input signal to the electrical network. A model with a memory is developed for the output signal, which is sampled at a low sampling rate, with this model approximating the output signal. The model is then transformed by suitable interpolation to an interpolated model with a memory. The interpolation results in the model created in this way providing a good approximation to an output signal which is sampled at a high frequency. The resultant system can be used for predistortion.

Abstract: An electrical network having a nonlinear transfer response is approximated with a system with memory. The system with memory being approximated in the frequency domain and subsequently being expanded in the time domain. A transfer response of the system being approximated to a transfer response of the electrical network in a range of a system bandwidth corresponding to an input signal bandwidth. The resulting model has adjustable parameters and can readily be implemented in the form of a dynamically linear filter and a static nonlinearity (B2) connected thereto.

Abstract: The invention relates to a power switch arrangement having a semiconductor power switch connected by its load path serially in a load circuit, and a clamping circuit, which is connected between a control electrode terminal and a load-side electrode terminal of the semiconductor power switch. Upon the turn-off of the semiconductor power switch, a clamping voltage is set across the load path thereof. The power switch arrangement additionally has a temperature estimator, which supplies an estimated value corresponding to an instantaneous peak temperature of the semiconductor power switch that occurs directly after the turn-off instant of the semiconductor power switch.

Abstract: The invention relates to a power switch arrangement having a semiconductor power switch connected by its load path serially in a load circuit, and a clamping circuit, which is connected between a control electrode terminal and a load-side electrode terminal of the semiconductor power switch. Upon the turn-off of the semiconductor power switch, a clamping voltage is set across the load path thereof. The power switch arrangement additionally has a temperature estimator, which supplies an estimated value corresponding to an instantaneous peak temperature of the semiconductor power switch that occurs directly after the turn-off instant of the semiconductor power switch.

Abstract: Driver circuit for driving voice and data signals from a switching center via a subscriber line (38) to a subscriber terminal, having: a controllable voice signal driver (12) which has a high output impedance in a quiescent operating mode and, in a working operating mode, drives an analog voice signal from the switching center via the subscriber line (38) to the subscriber terminal, with a low output impedance; a controllable data signal driver, which has a high output impedance in the quiescent operating mode and, in the working operating mode, drives an analog-modulated data signal in a data transmission frequency band (&Dgr;f) from the switching center via the subscriber line (38) to the subscriber terminal; an identification circuit (27), which, in the quiescent operating mode, identifies a current rise in a current flowing via the subscriber line (38) when the subscriber terminal is picked up, and produces a pick-up identification signal; and having a CODEC circuit (4), which, on receiving the pick-u

Abstract: Driver circuit for driving voice and data signals from a switching center via a subscriber line (38) to a subscriber terminal, having: a controllable voice signal driver (12) which has a high output impedance in a quiescent operating mode and, in a working operating mode, drives an analog voice signal from the switching center via the subscriber line (38) to the subscriber terminal, with a low output impedance; a controllable data signal driver, which has a high output impedance in the quiescent operating mode and, in the working operating mode, drives an analog-modulated data signal in a data transmission frequency band (&Dgr;f) from the switching center via the subscriber line (38) to the subscriber terminal; an identification circuit (27), which, in the quiescent operating mode, identifies a current rise in a current flowing via the subscriber line (38) when the subscriber terminal is picked up, and produces a pick-up identification signal; and having a CODEC circuit (4), which, on receiving the pick-up id