Abstract: The invention concerns a controllable current source or “charge pump” (12) in an integrated circuit, comprising two supply terminals (K1, K2) for the application of two supply potentials (V1, V2) as well as an output terminal (Kout) for the delivery of an output current, connected via a first controllable current path (T1) with the first supply terminal (K1), and via a second controllable current path (T2) with the second supply terminal (K2). In order to improve the current source (12) with regard to the quality of the output signal, it is provided according to the invention that the controllable current source (12) furthermore has a replica (T1?, T2?) of the current paths (T1, T2) in their non-controlled state, of which a replica output terminal (Kout?) is connected via a current mirror (T5 to T8) with the output terminal (Kout).

Abstract: The invention concerns a controllable current source or “charge pump” (12) in an integrated circuit, comprising two supply terminals (K1, K2) for the application of two supply potentials (V1, V2) as well as an output terminal (Kout) for the delivery of an output current, connected via a first controllable current path (T1) with the first supply terminal (K1), and via a second controllable current path (T2) with the second supply terminal (K2). In order to improve the current source (12) with regard to the quality of the output signal, it is provided according to the invention that the controllable current source (12) furthermore has a replica (T1?, T2?) of the current paths (T1, T2) in their non-controlled state, of which a replica output terminal (Kout?) is connected via a current mirror (T5 to T8) with the output terminal (Kout).

Abstract: A circuit arrangement for the analogue suppression of echoes, as in particular can be used in a hybrid-circuit for DSL-transmission systems, comprises a replica (8) for emulating the behaviour of the transmission line (17). In addition, a circuit (3, 4) for emulating the behaviour of the transmitter (13) is provided, which comprises at least one lowpass (3, 4). Furthermore, a replica (9, 10) for emulating the behaviour of bridge taps (14) can also be provided, which comprises at least one bandpass (9, 10). Additionally, a replica (19) for emulating the behaviour of the line driver (1) can also be provided.

Abstract: The invention relates to an integrated circuit (210) for an on-wire communication system, comprising several communication connections (C) for connecting external electrical signal lines (L), wherein an input/output circuit (IO) for inputting and/or outputting communication signals from or to the signal lines (L) is associated with each communication connection (C); wherein one of several thyristors (TY) is associated with each communication connection (C) in order to reduce any overvoltage which occurs at the respective communication connection (C) by a current flow through this thyristor (TY); wherein a control electrode (G′) of each thyristor (TY) is connected to a control circuit (CO) which detects a current flow through this thyristor (TY), and in the case of a detected current flow de-energises that input/output circuit (IO; O) which is associated with that communication connection (C; C, C′) with which this thyristor (TY) is associated.

Abstract: A circuit arrangement for the analogue suppression of echoes, as in particular can be used in a hybrid-circuit for DSL-transmission systems, comprises a replica (8) for emulating the behaviour of the transmission line (17). In addition, a circuit (3, 4) for emulating the behaviour of the transmitter (13) is provided, which comprises at least one lowpass (3, 4). Furthermore, a replica (9, 10) for emulating the behaviour of bridge taps (14) can also be provided, which comprises at least one bandpass (9, 10). Additionally, a replica (19) for emulating the behaviour of the line driver (1) can also be provided.

Abstract: The invention relates to an amplifier circuit having a circuit input for a circuit input signal (Vin) to be amplified and an amplification zone for amplifying the circuit input signal (Vin). The invention provides that the amplification zone comprises two amplifiers (OPV1, OPV2), each of which is countercoupled, and which the circuit input signal (Vin) is fed in parallel, and the amplifier outputs of which are or can be connected with a circuit output to provide a circuit output signal (Vout), wherein the amplification input zone of one of the two amplifiers (OPV1) is connected with the amplification input zone of the other of the two amplifiers (OPV2) by means of a further amplifier (A), in such manner that signal distortions at the two amplifier outputs (Vout1, Vout2) essentially cancel each other out. The amplifier circuit according to the invention thus provides for particularly power-efficient amplification of the signal.

Abstract: A device for echo attenuation in a digital transmission system comprises an impedance replica of the transmission path. The impedance replica consists of a terminating resistance replica, a transformer replica, and a transmission line replica. The device may further comprise a bridged tap replica. The transformer replica and the bridged tap replica are provided as on-chip components. The main transformer inductance replica and all components of the bridged tap replica are variable and may be set by software control.

Abstract: The invention relates to an amplifier circuit having a circuit input for a circuit input signal (Vin) to be amplified and an amplification zone for amplifying the circuit input signal (Vin).