Abstract: Techniques are described for increasing the speed of a resistor-based charge pump for an active loop filter-based phase-locked loop (PLL). The techniques may include placing a low-resistance discharge path between respective nodes of a current source and sink in a charge pump, and selectively activating the low-resistance discharge path when the charge pump is turned off. The low-resistance discharge path may have a resistance that is lower than the resistance of other current paths between the respective nodes in the charge pump (e.g., current paths formed by the resistors included in the current source and sink of the charge pump), thereby reducing the amount of time needed to reset the charge on the respective nodes when the charge pump is turned off. In this way, the speed of a resistor-based charge pump may be increased, thereby allowing the overall speed of an active filter-based PLL to be increased.

Abstract: Techniques are described for increasing the speed of a resistor-based charge pump for an active loop filter-based phase-locked loop (PLL). The techniques may include placing a low-resistance discharge path between respective nodes of a current source and sink in a charge pump, and selectively activating the low-resistance discharge path when the charge pump is turned off. The low-resistance discharge path may have a resistance that is lower than the resistance of other current paths between the respective nodes in the charge pump (e.g., current paths formed by the resistors included in the current source and sink of the charge pump), thereby reducing the amount of time needed to reset the charge on the respective nodes when the charge pump is turned off. In this way, the speed of a resistor-based charge pump may be increased, thereby allowing the overall speed of an active filter-based PLL to be increased.

Abstract: Systems and methods are disclosed to enable determining thermal protection characteristics of an integrated circuit. In one embodiment, an integrated circuit includes a proportional to absolute temperature (PTAT) generator that provides a PTAT signal that varies as a function of temperature. Thermal protection control system provides an output signal indicative of a thermal protection condition based at least in part on the PTAT signal. A monitoring system that provides a path to enable selective measuring of at least one signal associated with operation of the thermal protection control system.

Abstract: Systems and methods are provided for switching between power supply rail voltages for a differential driver device of a class G amplifier device. The amplifier device employs power MOSFETs to switch between supplying high supply voltages and low supply voltages to the power rails of the differential driver. The class G amplifier can be employed in driving an ADSL signal over a telephone line. A control device ramps the power supply rail voltage between low power supply states and high power supply states to mitigate noise and spikes that can be coupled to the output signal.

Abstract: A bias device that modifies the bias of a device based on an input signal to the device. The device may have a fixed bias, and the bias device can be connected in parallel with the fixed bias. The device can be an amplifier, such as a linear amplifier or a class AB amplifier. The bias device can be configured to provide maximum bias during the device's crossover time period.

Abstract: Systems and methods are provided for switching between power supply rail voltages for a differential driver device of a class G amplifier device. The amplifier device employs power MOSFETs to switch between supplying high supply voltages and low supply voltages to the power rails of the differential driver. The class G amplifier can be employed in driving an ADSL signal over a telephone line. A control device ramps the power supply rail voltage between low power supply states and high power supply states to mitigate noise and spikes that can be coupled to the output signal.

Abstract: The present invention provides an apparatus and method for operating driver amplifier (20) of a line driver circuit (10) from a lower set of power supply voltages, and from a higher set of voltages only when the amplitude of the signal (12) being transmitted by the line driver (20) requires it as determined by a comparator (18). Advantageously, this reduces the power dissipation in the line driver (10) by operating the line amplifier (20) the majority of the time from the lower supply voltage. A delay circuit (14) delays the signal to be amplified sufficient to allow the transitioning of the power supply voltages provided to the amplifier hysteresis of this power supply voltage switching may also be used to further reduce power dissipation.

Abstract: The present invention provides an apparatus and method for operating driver amplifier (20) of a line driver circuit (10) from a lower set of power supply voltages, and from a higher set of voltages only when the amplitude of the signal (12) being transmitted by the line driver (20) requires it as determined by a comparator (18). Advantageously, this reduces the power dissipation in the line driver (10) by operating the line amplifier (20) the majority of the time from the lower supply voltage. A delay circuit (14) delays the signal to be amplified sufficient to allow the transitioning of the power supply voltages provided to the amplifier hysteresis of this power supply voltage switching may also be used to further reduce power dissipation.

Abstract: A fabric presents a non-camouflage pattern under visible light and a camouflage pattern under infrared radiation. The fabric may appear under visible light to have a continuous solid color and thus be suitable for use in police uniforms.

Abstract: A paper document pocket for receiving and stacking sorted documents from a high-speed reader sorter used in the banking industry and similar applications. The pocket is designed to stack in columns paper documents of various sizes and paper weights in sequential order without producing paper jams.

Abstract: As documents are moved serially past a servo motor-driven endorser, it endorses a stamp upon each. A transport signal dependent on document speed, and an endorser signal generated by an optical tachometer mounted to the servo motor, provide input to a frequency comparator. The output of the comparator is a control signal which controls the servo motor speed to adjust the endorser rotational surface velocity to equalization with the document speed. Logic circuitry sets the endorser at a zero angular position. Responsive to an endorse command, the endorser is accelerated to document speed, receives ink from a supply roller, then endorses the passing document. A counter and a digital comparator in cooperation with the tachometer signal completion of the endorsement whereupon the endorser is decelerated and placed in the zero position.