Abstract: In examples, an apparatus includes a transistor, a switch, a diode, a capacitor, a voltage divider, a second transistor, a resistor, and a controller. The transistor has a transistor drain, a transistor source, and a transistor gate. The switch is adapted to couple a power supply to the transistor drain through an inductor. The diode has a cathode and an anode, the diode cathode coupled to the transistor drain. The capacitor is coupled between the diode anode and ground. The voltage divider is coupled between the diode anode and ground and having a voltage divider output. The second transistor has a second transistor source and a second transistor gate. The resistor is coupled between the diode anode and the second transistor source. The controller is coupled to the transistor gate, the transistor source, the voltage divider output, the diode anode, the second transistor gate, and the second transistor source.

Abstract: In examples, an apparatus includes a transistor, a switch, a diode, a capacitor, a voltage divider, a second transistor, a resistor, and a controller. The transistor has a transistor drain, a transistor source, and a transistor gate. The switch is adapted to couple a power supply to the transistor drain through an inductor. The diode has a cathode and an anode, the diode cathode coupled to the transistor drain. The capacitor is coupled between the diode anode and ground. The voltage divider is coupled between the diode anode and ground and having a voltage divider output. The second transistor has a second transistor source and a second transistor gate. The resistor is coupled between the diode anode and the second transistor source. The controller is coupled to the transistor gate, the transistor source, the voltage divider output, the diode anode, the second transistor gate, and the second transistor source.

Abstract: A controller for a voltage regulator includes a hysteretic circuit that generates a hysteretic voltage output as a function of a regulated voltage and that generates a hysteretic current output as a function of an inductor current. A switch control circuit provides a quasi-continuous control output as a function of the hysteretic current output from a start time when the regulated voltage rises above a higher hysteretic voltage until a stop time when the regulated voltage falls below a lower hysteretic voltage.

Abstract: A controller includes a hysteretic circuit that provides a first ON level pulse when a corresponding first negative regulated voltage rises above a respective first voltage threshold. Similarly, a second ON level pulse is provided when a corresponding second positive regulated voltage falls below a respective second voltage threshold. The hysteretic circuit provides an OFF level pulse when one of first and second switch currents increases above a current threshold. A switch control circuit receives the first and second ON level pulses and the OFF level pulse, and provides first and second switch control outputs to separately regulate the first and second regulated voltages.

Abstract: A power regulator system is described. The system includes a switching system comprising at least one switch and an inductor, the switching system being configured to provide an output voltage based on a current through the inductor. The system also includes a switch driver configured to provide a switching signal to the switching system to control the operation of the at least one switch to provide the current through the at least one inductor. A mode controller is configured to switch the switch driver between a continuous mode of operation and a discontinuous mode of operation based on both a feedback voltage associated with the output voltage and at least one other predetermined operating condition associated with each of the continuous and discontinuous modes of operation.

Abstract: A controller includes a hysteretic circuit that provides a first ON level pulse when a corresponding first negative regulated voltage rises above a respective first voltage threshold. Similarly, a second ON level pulse is provided when a corresponding second positive regulated voltage falls below a respective second voltage threshold. The hysteretic circuit provides an OFF level pulse when one of first and second switch currents increases above a current threshold. A switch control circuit receives the first and second ON level pulses and the OFF level pulse, and provides first and second switch control outputs to separately regulate the first and second regulated voltages.

Abstract: A controller for a voltage regulator includes a hysteretic circuit that generates a hysteretic voltage output as a function of a regulated voltage and that generates a hysteretic current output as a function of an inductor current. A switch control circuit provides a quasi-continuous control output as a function of the hysteretic current output from a start time when the regulated voltage rises above a higher hysteretic voltage until a stop time when the regulated voltage falls below a lower hysteretic voltage.

Abstract: One embodiment of the invention includes a power regulator system. The system includes a switching system comprising at least one switch and an inductor, the switching system being configured to provide an output voltage based on a current through the inductor. The system also includes a switch driver configured to provide a switching signal to the switching system to control the operation of the at least one switch to provide the current through the at least one inductor. A mode controller is configured to switch the switch driver between a continuous mode of operation and a discontinuous mode of operation based on both a feedback voltage associated with the output voltage and at least one other predetermined operating condition associated with each of the continuous and discontinuous modes of operation.

Abstract: Calibration of pattern recognition in bright field imaging systems is disclosed. A target pattern on a substrate on the stage is brought into focus of a bright field system. The image is scanned in a first direction while measuring an edge scattering pattern from a feature of the target pattern. The edge scattering pattern is characterized by first and second peaks. A position of the bright field system's illuminator or beam shaping and relay optics is adjusted perpendicular to an optical path until the first and second peaks are approximately equal in height.