Abstract: Integrable current supply circuit An integrable current supply circuit for feeding a supply current to a signal line (12) having a current source (14) for producing a source current which is emitted via a connection line (18) to an input of a current amplifier (20), which amplifies the source current and feeds the amplified source current as a supply current via a current output (2) of the current supply line to the signal line (12), with the current source (14) and the current amplifier (20) having parasitic capacitances, distinguished by a compensation capacitor (28) which is connected to the current output (2) and whose capacitance corresponds to the parasitic capacitances, and a current mirror circuit (31) which emits the charging current that flows through the compensation capacitor (28) in order to compensate for the charging currents flowing through the parasitic capacitances in mirrored form onto the connection line (18) connected between the current source (14) and the current amplifier (20).

Abstract: A differential line driver circuit having an output impedance matched to the line impedance includes first and second input terminals for the application of an input signal, a fully differential operational amplifier having inverting and non-inverting signal inputs connected to first and second input terminals respectively, first and second signal outputs providing in-phase and quadrature amplified output signals, and gain adjusting impedances connected between the input terminals and the amplifier's signal inputs. First and second feedback impedances connect between inverting and non-inverting signal inputs of the amplifier and its first and second signal outputs. First and second matching impedances connect first and second amplifier outputs to corresponding output terminals of the line-driver circuit. First and second positive-feedback impedances connect the first and second output terminals of the line driver circuit to the non-inverting and inverting inputs of the amplifier.

Abstract: Integrable current supply circuit An integrable current supply circuit for feeding a supply current to a signal line (12) having a current source (14) for producing a source current which is emitted via a connection line (18) to an input of a current amplifier (20), which amplifies the source current and feeds the amplified source current as a supply current via a current output (2) of the current supply line to the signal line (12), with the current source (14) and the current amplifier (20) having parasitic capacitances, distinguished by a compensation capacitor (28) which is connected to the current output (2) and whose capacitance corresponds to the parasitic capacitances, and a current mirror circuit (31) which emits the charging current that flows through the compensation capacitor (28) in order to compensate for the charging currents flowing through the parasitic capacitances in mirrored form onto the connection line (18) connected between the current source (14) and the current amplifier (20).

Abstract: Broadband driver for signals that are transmitted in different frequency ranges, comprising:

Abstract: Transceiver for transmitting and receiving voice signals and data signals having:

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

Abstract: A differential line driver circuit having an output impedance matched to the line impedance includes first and second input terminals for the application of an input signal, a fully differential operational amplifier having inverting and non-inverting signal inputs connected to first and second input terminals respectively, first and second signal outputs providing in-phase and quadrature amplified output signals, and gain adjusting impedances connected between the input terminals and the amplifier's signal inputs. First and second feedback impedances connect between inverting and non-inverting signal inputs of the amplifier and its first and second signal outputs. First and second matching impedances connect first and second amplifier outputs to corresponding output terminals of the line-driver circuit. First and second positive-feedback impedances connect the first and second output terminals of the line driver circuit to the non-inverting and inverting inputs of the amplifier.

Abstract: Differential line driver circuit (1) for driving a line signal output via a signal line, having a first input terminal (2) for applying a first input signal, a second input terminal (3) for applying a second input signal, a first operational amplifier (4), whose non-inverting input (6) is connected to the first input terminal (2) of the line driver circuit (1), and whose signal output (16) is connected to the inverting input (8) via a feedback impedance (24), a second operational amplifier (5), whose non-inverting input (7) is connected to the second input terminal (3) of the nine driver circuit (1), and whose signal output (17) is connected to the inverting input (9) via a feedback impedance (25), an adjusting impedance (26) for gain adjustment, the adjusting impedance (26) being connected between the inputs (8, 9) of the two operational amplifiers (4, 5), a first matching impedance (20), which is connected between the signal output (16) of the first operational amplifier (4) and a first output terminal (28)