Abstract: A controllable resistive element and method for updating the resistance of the same includes a state device configured to provide a voltage-controlled resistance responsive to a voltage input. A battery is configured to apply a voltage to the voltage input of the state device based on a charge stored in the battery. A write device is configured to charge the battery responsive to a write signal. An erase device is configured to discharge the battery responsive to an erase signal.

Abstract: The joint (36) comprises a tubular body (37) having two connecting zones (38, 39) each connected by an end to a tubular element (40) of a fluid transport line, giving continuity to passage of fluid. The tubular body is made of a mixture of an electrically-conductive material such as PVC, with carbon black to give it electrical conductivity. The joint has an internal surface (41) which is destined to come into contact with the transported fluid, and an external surface which is destined to have a grounded galvanic contact. The joint is inserted in the discharge fluid drainage line of a dialyzer filter, in an apparatus for intensive treatment of acute renal insufficiency, for eliminating ECG artefacts due to functioning of peristaltic pumps in the apparatus.

Abstract: A quadrature modulation circuit includes a mixer circuit including an integrated sign modulation control circuit and a plurality of mixer ports. The mixer ports include a first input port, a second input port, an output port and a sign modulation control port. The modulation circuit generates a modulated signal by operation of the mixer circuit multiplying a modulating signal applied to the first input port with a carrier signal applied to the second input port to generate a mixed signal output from the output port, and by operation of the integrated sign modulation control circuit controlling polarity switching of a signal at one of the mixer ports in response to a sign modulation control signal input to the sign modulation control port.

Abstract: The joint (36) comprises a tubular body (37) having two connecting zones (38, 39) each connected by an end to a tubular element (40) of a fluid transport line, giving continuity to passage of fluid. The tubular body is made of a mixture of an electrically-conductive material such as PVC, with carbon black to give it electrical conductivity. The joint has an internal surface (41) which is destined to come into contact with the transported fluid, and an external surface which is destined to have a grounded galvanic contact. The joint is inserted in the discharge fluid drainage line of a dialyzer filter, in an apparatus for intensive treatment of acute renal insufficiency, for eliminating ECG artefacts due to functioning of peristaltic pumps in the apparatus.

Abstract: A circuit for detecting asynchronous events includes a first event detection latch; and a second event detection latch coupled to the first event detection latch, wherein the first event detection latch is ready to detect an event when the second event detection latch is being reset and wherein the second event detection latch is ready to detect a next event when the first event detection latch is being reset.

Abstract: A bidirectional battery disconnect switch, i.e., a switch which is capable of blocking a voltage in either direction when open and conducting a current in either direction when closed, is disclosed. The switch includes a four-terminal MOSFET having no source/body short and circuitry for assuring that the body is shorted to whichever of the source/drain terminals of the MOSFET is biased at a lower voltage.

Abstract: A device which uses a detection circuit to determine whether an output current thereof is source-induced or load-induced, and the method therefor. The device which performs some type of operation based upon the determination as to whether the output current thereof is source-induced or load-induced, and method therefor. The detection circuit determines whether polarities of the output current and an output voltage are the same, and determines the output current to be source-induced if the polarities are the same and load-induced if the polarities are opposite each other. Such a device may have many applications, including use in systems where distinctions between source and load-induced currents are employed in feedback systems to control the system voltage source, systems where the system voltage source is not controlled, but other sources are controlled to influence a summation of voltages and currents at sensing locations, and systems for measurement instrumentation.

Abstract: A synchronization control scheme that provides a drive signal to a plurality of switching circuits and method of operation therefor.

Abstract: The present invention provides a clocking circuit allowing individual macrocells in a particular macrocell block of a CPLD to use different polarities of the same clock. The input clock pin can now drive all the macrocells directly, which can eliminate additional buffering states and improve the clock to out timing, Tco, by (for example) 300 ps. The clocks are presented directly to the clock selection multiplexers for each macrocell. Additional functioning may be realized by implementing additional configuration bits inside the clocking architecture.

Abstract: A circuit for detecting timing errors and for selecting the correct clock edge for mid-point data sampling, includes a rising edge sampling device for sampling an input data signal at a rising edge of an input clock and generating a first interim data signal. A falling edge sampling device samples the input data signal at a falling edge of the input clock and generates a second interim data signal. An error signal generation devise, arranged in each of the rising edge and falling edge sampling devices, generates an error signal if designated setup time and hold time requirements are not met. The error signal is one of an error-rise or error-fall signal. A state machine receives the first and second interim signals and the error signal. The state machine automatically outputs the first interim data signal to a logic device if the error-fall signal is detected, and outputs the second interim data signal to the logic device if the error-rise signal is detected.

Abstract: A power supply circuit is set forth which overcomes the problems associated with incorrect battery insertion. The power supply circuit includes first and second battery terminals for electrical connection to the battery. The first and second battery terminals are connected to a first transistor switching circuit. The first transistor switching circuit is responsive to power from the battery to through-connect a negative polarity power signal therethrough irrespective of the polarity orientation of the battery. The first and second battery terminals are also connected to a second transistor switching circuit. The second switching circuit is responsive to power from the battery to through-connect a positive polarity power signal therethrough irrespective of polarity orientation of the battery. The negative and positive polarity power signals are available for connection to a load device, such as a hearing aid amplifier.

Abstract: A plurality of battery/voltage polarity switching circuits are constrained to operate in switching synchronism by a timing circuit associated with each polarity switching circuit that are interrelated to one another such that only the fastest response timing circuit is operative to supply a common synchronizing signal to all the polarity switching circuits.

Abstract: A reverse current limited circuit configured to provide a reverse current limited low dropout voltage output. The reverse current limited circuit, coupled between a pair of terminals, comprises (i) a MOS pass transistor coupled in series between the first and second terminals, (ii) connection circuitry to connect the substrate of the MOS pass transistor to either one of the pair of terminals based on the relative magnitudes of the voltages measured on the pair of terminals, (iii) activation circuitry for turning on and off the MOS pass transistor based on the relative magnitudes of the voltages measured on the pair of terminals and (iv) comparison circuitry used to compare the voltages of the pair of terminals and to control the activation circuitry and the connection circuitry in response to the comparison made.

Abstract: A measurement circuit in the output circuit of a sensor detects the polarity of a source to which a load is connected. The detection of one of the two polarities establishes one of two states which is stored in a storing element and the correct one of two drivers is switched to the output terminals. This state is maintained for as long as there is no change to the polarity at the output terminals. If the terminals are interchanged, then the measurement circuit correctly restores the stored state, so that the correct driver is associated with the load in each case. If positive instead of negative switching sensors are required, there is no need to replace the equipment. When the voltage is turned on, the equipment is initialized, so that it is set in accordance with the new circumstances.