Infineon Technologies Ag

Pacesetter, Inc.

St. Jude Medical Ab

Telefonaktiebolaget Lm Ericsson (publ)

Allan Olson

Cecilia Qin Xi

Weiqun Yang

Jimmy Johansson

Louis Wong

Lars Karlsson

Albin Johansson

Anders S&ouml;derb&auml;rg

Torbjorn Ivar Randahl

Torbj&ouml;rn Randahl

Tore Andr&eacute;

Marcus Berner

An implantable system includes terminals, a pulse generator, a sensing circuit, separate signal processing channels, and first, second and third multiplexers. The terminals are connected to electrodes via conductors of leads. Different subsets of the electrodes are used to define different electrical pulse delivery vectors, and different subsets of the electrodes are used to define different sensing vectors. The pulse generator produces electrical pulses, and the sensing circuit senses a signal indicative of an impedance associated with a selected sensing vector. The first multiplexer selectively connects outputs of the pulse generator to a selected one of the different electrical pulse delivery vectors at a time. The second multiplexer selectively connect inputs of the sensing circuit to a selected one of the different sensing vectors at a time. The third multiplexer selectively connects an output of the sensing circuit to one of the plurality of separate signal processing channels at a time.

Systems and methods for obtaining substantially simultaneous multi-channel impedance measurements and related applications

Systems and methods for obtaining substantially simultaneous mult-channel impedance measurements and related applications

The present invention generally relates to implantable medical devices, such as pacemakers, and, in particular, to a method and an implantable medical device capable of detecting the presence of noise caused by external noise sources. Voltages and/or impedances are measured over one or several electrode configurations. Based on the measured voltages and/or impedances, noise parameters are calculated, which are compared with reference values to detect the presence of noise. In another aspect of the invention, at least two different electrode configurations with different noise pick-up areas are used in the measurement. Relations between the noise parameters of the at least two vectors are calculated and compared with reference relations to detect the presence of noise.

Method and device for detecting noise

In a method and device for measuring an electrical bio-impedance of a patient at least one impedance measurement signal is generated by a current pulse generator, the signal having at least one asymmetric multiphasic impedance measurement waveform that is asymmetric in term of pulse amplitude and/or pulse width relative to the operating voltage of the current pulse generator. The waveform has a DC component that is substantially equal to zero, and is adapted to the available voltage headroom of an implantable device that contains the current pulse generator. The impedance measurement signal with the aforementioned waveform is applied to a patient and a resulting impedance signal is produced thereby, from which at least one impedance value is determined.

Method and implantable medical device for measuring an electrical bio-impedance of a patient

In a transmitter/receiver for bidirectional communication with a transmission medium, the transmitter comprises an amplifier having an input terminal for signals to be transmitted, an output stage with output terminals coupled via resistors to the transmission medium, and a negative feedback circuit connected with its input terminals to the output terminals and with its output terminal to the input terminal of the amplifier. The receiver is connected with first input terminals to the output terminals of the output stage. A current mirror is connected with its input terminal to the input terminal of the amplifier output stage and with its output terminals via resistors across a load. The load is connected across second input terminals of the receiver. The receiver is adapted to extract signals received from the transmission medium by subtracting voltages between said second input terminals from voltages between said first input terminals.

Transmitter/receiver for bidirectional communications

To minimize power dissipation in a line driver ( ) in a central office (CO) for driving a DSL connection to a network terminal (NT) with a predetermined maximum constellation size, the central office (CO) supplies the line driver ( ) with a predetermined supply voltage during a training sequence, and transfers data with a predetermined power spectral density in all available channels. The network terminal (NT) measures the signal-to-noise ratio of each channel, and transfers information to the central office (CO) about channels having signal-to-noise ratios that enable transfer of data. The central office (CO) reduces the power spectral density to a lowest possible value that still enables transfer of data in all channels having signal-to-noise ratios above a predetermined threshold as set by the maximum constellation size, calculates a sum of power to be transmitted in said channels, converts said sum into a corresponding line driver output voltage, and reduces the line driver supply voltage in correspondence thereto.

Method and arrangement for minimizing power dissipation in a line driver

To compensate for temperature dependent variations and process variations in surface resistance of a main resistor (R ) on a chip ( ), one or more compensating resistors (R , R . . . R ) can be connected in series with the first resistor (R ) via normally open switches (SR , SR . . . SR ). The switches are closed to connect one or more of the compensating resistors (R , R . . . SR ) in series with the main resistor (R ) in response to whether the voltage across resistors (R , R . . . R ) produced on the chip ( ) in the same process and proportional to the compensating resistors (R , R . . . R ) is higher or lower than a fixed reference voltage (VR ).

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Spanga, Sweden

Allan Olson