Licentia Patent-verwaltungs Gmbh

Daimler-benz Ag

Daimler Chrysler Ag

Mercedes-benz Aktiengesellschaft

Wabco Standard Gmbh

Bernhard Rall

Jurgen Dorner

Dietrich Hoppner

Juergen Dorner

Willy Minner

Juergen Minuth

Hans Schussler

Thilo Kuhner

Bernd Haussler

Franz-Josef Petry

Erich Bachle

Bernd Haeussler

Thilo Kuehner

Helmut Kliem

Hans-Jurgen Wulf

Michael Schaefer

Helmut Knapp

Holger Behrends

Kurt Eberhardt

Klaus Schluter

Wolfgang Appel

Johann Burkhart

Roland Haun

Sebastion Grimmeisen

Sebastian Grimmeisen

Franz Josef Petry

In a circuit arrangement for adapting the characteristic wave impedance at line ends of a vehicle data bus having at least two data bus lines and data terminals, each with a transceiver unit for differential-mode signal transmission on the data bus, the data bus is connected to the transceiver unit via a connection interface that includes a reactor for filtering interference on the data bus and an adaptation resistor network for adapting the characteristic wave impedance of a data bus line. The adaptation resistor network is arranged between the reactors and the respective line ends of the data bus lines, while the adaptation resistor network connects the line ends to ground via a capacitor.

Circuit for adapting characteristic wave impedance

A circuit arrangement for reducing interfering longitudinal voltages on a two-wire line includes a reduction circuit for reducing the interfering longitudinal voltages, a detector coupled to the two-wire line that generates a switch-off signal in the absence of a push-pull signal on at least one of the cores in the two-wire line and a switch circuit that switches off the reduction circuit in response to the switch-off signal.

Circuit arrangement with a reduction circuit for reducing interfering longitudinal voltages on a two-wire line

A circuit in which driver units are associated with data networks that are coupled through at least two single transmission channels is provided. The driver units have a logical signal input and a logical signal output on their sides facing away from the data network, with the signal input or signal output of one driver unit being connected with the signal output or signal input of the other driver unit through a signal transmission channel in each case for coupling each of two data networks. A logical coupling control unit is looped into the coupling signal transmission channels. The unit blocks the signal path to the other signal transmission channel when predetermined blocking signal information appears on one signal transmission channel. This ensures that feedback and oscillation effects are suppressed during the transmission of signals over the transmission channels. The circuit can be used for coupling CAN data networks in motor vehicles.

Circuit for signal-transmitting connection of data networks

An arrangement for monitoring a two-wire bus line for serial transmission of digital data includes a bus subscriber receiving circuit coupled to the two-wire line and including three comparators each having two inputs and an output for producing a logical output signal in dependence of signals at the two inputs. A signal line voltage on each wire of the two-wire bus line is applied, respectively, to the two inputs of a first one of the comparators and one of the two signal line voltages, an auxiliary voltage is applied, respectively, to the two inputs of a second one of the comparators and the other of the two signal line voltages and an auxiliary voltage being applied, respectively, to the two inputs of a third one of the comparators. A logic circuit is coupled to the outputs of the three comparators for simultaneously receiving the logical output signals of at least the second and third comparators and for signaling a fault-free condition of the bus system if all received logical output signals from the comparators are in agreement, and for signaling a fault if all received logical output signals from the comparators are not in agreement.

Arrangement for monitoring a two-wire bus line

Data communication system

A data communication system, particularly for motor vehicles, includes a bus system with transmission lines which connect terminal devices to a common node. A protective circuit is connected between the transmission lines and a reference potential such as ground. If the ground connection of one of the terminal devices becomes detached, this protective circuit allows communication among the remaining terminal devices. The protective circuit is simultaneously secured against destruction in case of a short circuit.

A cable arrangement with two pairs of conductors for two separate circuits, one conductor of a pair is split into two partial conductors. Neutralization, i.e., capacitive and inductive uncoupling of the two circuits is possible by symmetrical arrangement of the conductors.

Cable arrangement

To control the earphone and microphone amplifiers as well as the balancing network of a subscriber's telephone terminal which is fed, through a subscriber line in communication systems, to the effect that the attenuations in subscriber lines of unequal lengths do not affect the transmission characteristics between the exchange and the subscriber, a circuit arrangement is provided for producing the necessary control function, which is simple, integratable and has minimum tolerances. Above a predetermined threshold value, a voltage proportional to the line current variations controls the emitter-to-base junction of two grounded-base transistors at the collectors of which the control current is available. The control currents produce their effect on the negative feedback of the microphone and the earphone amplifiers. An increasing line current causes the cotrol current to decrease, thereby effecting a stronger feedback and a reduced amplification. Further, the voltage proportional to the line current variations and available at the emitter resistor of another transistor, controls the balancing impedance through a current mirror, to attenuate the sidetone independently of the length of the subscriber line.

Circuit arrangement for producing control means from line current

In a switching network in matrix form for megahertz frequency signals, including: a multilayer printed circuit board having a plurality of row signal lines located in a first plane, a plurality of column signal lines located in a second plane and extending transverse to the row lines, the row and column signal lines intersecting one another in an intersection area, control and/or shielding conductors surrounding the lines, and metal shields enclosing the planes; a crosspoint array integrated on a chip and providing a plurality of crosspoints for the intersection area, each crosspoint presenting two semiconductor switches arranged to couple a respective column signal line to a respective row signal line; and a shielded package enclosing the chip, each line is constituted by a balanced pair of stripline conductors and is terminated at each end by its characteristic impedance. Between two signal conductor pairs in a plane there are control or power-supply conductors which are grounded for high frequencies for shielding purposes. Each crosspoint includes a balanced amplifier having two amplifying paths with internal neutralization of crosstalk via additional non-operating transistors, and high impedance input and output circuits connecting the amplifier between its row and column lines, and the module is connected to the circuit board via plug-in socket elements fastened to the circuit board and mating plug connector pins fastened to the shielded package.

Switching network for megahertz frequency signals

A circuit arrangement for feeding a module requiring a constant operating voltage in a user station fed by a current-conducting connection path, composed of: components defining a current control unit connected for controlling the current in the connection path; components defining a resistance control unit connected for controlling the alternating current resistance presented by the circuit arrangement to the connection path; a first current conducting branch connected for feeding current supplied by the connection path to the module; a second current conducting branch connected for conducting current supplied by the connection path in a manner to bypass the module; and a signal responsive switch connected for establishing current flow between the connection path and a selected one of the branches.

Circuit arrangement for feeding modules in user stations

A circuit arrangement for stabilizing a direct current comprises a parallel controller for controlling a transistor connected in series with the load.

Circuit arrangement for stabilizing a direct current

A circuit, for producing direct voltages, for example the tuning voltages for a television or radio receiver, lying within a direct voltage range from pulses fed to an integrating circuit at whose output the direct voltages appear. A plurality of pulses (I) are fed to the integrating circuit, at whose output the direct voltage (U.sub.I) appears, within a period duration (T) assigned to the desired direct voltage range, with the period duration (T) being at least of the magnitude T = (U.sub.max - U.sub.min) .multidot..DELTA..tau./.DELTA.U.sub.I, where (U.sub.max - U.sub.min) is the desired direct voltage range, .DELTA..tau. is the shortest time duration of a pulse (I) and .DELTA.U.sub.I is the smallest voltage step width associated with the shortest pulse duration .DELTA..tau. by which two different direct voltages (U.sub.I) at least differ from one another.

Circuit for producing direct voltages from pulses

A monolithically integrated semiconductor matrix circuit arrangement comprising switching elements which are connected in pairs at one terminal. This common terminal of the pair of switching elements is connected to an input (or output) circuit path and other terminal of each switching element is connected individually to an output (or input) circuit path respectively.

Monolithically integrated semiconductor circuit arrangement

In an electronic switching device for use as the switching component of a switching network in a telephone central office, the device being composed of a switching transistor connected in series in the signal conduction path for switched signals and a controllable impedance connected in a shunt branch, the switching transistor, in its conductive state, having a low series resistance and an associated high shunt resistance, and, in its blocking state, having a high series resistance and an associated low shunt resistance, the shunt branch is composed of a control transistor having a control voltage applied to its base, having its collector connected to the base of the switching transistor, and having its emitter connected to the switching transistor through a resistor to constitute a feedback path for the switching transistor, a voltage-dependent resistor connected to the base of the switching transistor, and suitable sources of operation voltages, the voltages and characteristics of the voltage-dependent resistor being selected to be such that when the switching transistor is conductive, the control transistor operates conductively in its active region and the voltage-dependent resistor presents a high resistance and when the switching transistor is blocking the control transistor is also blocking and the voltage-dependent resistor has a low resistance and supplies to the base of the switching transistor a voltage which maintains the switching transistor blocking.

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Ulm, Germany

Bernhard Rall