Abstract: A voltage boost circuit having dual voltage outputs and a single input receives a DC voltage from an external source. The input voltage is boosted to provide a constant voltage at the first output at a level higher than the voltage input and to provide a constant voltage output at the second output. A switch is coupled to the output of the inductor for controlling the current flow to the second output.

Abstract: A transmitter for a differential serial data communication bus incorporating the CAN format includes features for minimizing radiated emissions. The transmitter includes a second order input filter for establishing a slew rate of pulses edges and for rounding corners, a first amplifier for attenuating and level shifting the filtered input to produce a first bus output, and a second amplifier coupled to the first bus output for producing a second bus output mirroring the first. The second amplifier has a high unity gain frequency and a closed loop configuration, both for minimizing phase differential of the two outputs.

Abstract: A voltage boost circuit having a voltage output and a single input receives a DC voltage from an external source which is fed to an inductor. The input voltage is boosted to provide a constant voltage at the output at a level higher than the voltage input. A switch is coupled to the output of the inductor for controlling current through the inductor to induce a boosted voltage across the inductor.

Abstract: In a preferred embodiment, a multi-configurable output driver, including: first circuitry to provide driving current to an inductive load; the first circuitry being configurable, without the addition or rearrangement of components, in at least two different output topographies; and second circuitry to configure the first circuitry in a selected one of the at least two different output topographies in response to input signals.

Abstract: In a preferred embodiment, a multi-configurable output driver, including: circuit apparatus to provide driving current to an inductive load; and the circuit apparatus being configurable, without the addition or rearrangement of components, in at least two different output topographies.

Abstract: A boost circuit effects increasing current flow through an inductor and a switch when the switch is closed, and then, when the switch is open, directs the inductor current through a diode to charge a storage capacitor at the output. A logic circuit operates the switch. The switch is controlled on by sensing low current flow in the capacitor and off by sensing high current flow in the switch, so that inductor current is continuous.

Abstract: A class 2 or UART data communication bus is subject to disruption by induce high frequency currents because of an impedance mismatch between a passive pull-up or pull-down resistor and a lower impedance active current sourcing or sinking stage. An impedance reduction circuit across the passive resistor balances the impedance in the presence of high frequency noise. The impedance reduction circuit is operative when it senses a bus line voltage slew rate greater than that caused by data pulses and a voltage change greater than one diode drop.