Abstract: A portable illumination device includes a first component having a light source(s) and a second component coupled to the first component, and the second component includes a curved handle containing one or more battery cells within the curved handle, wherein the light source(s) are powered via the one or more battery cells, and wherein a center of mass of the illumination device is located in the curved handle. By way of example, the brightnesses of the light source(s) are adjustable and the control firmware of the micro-controller inside the portable illumination device is upgradable. In addition, the curved handle's center position may have a foldable hook for hanging the device downward so that it may be used as a lantern or flash light.

Abstract: A unity-gain buffer circuit structure, used to receive an input voltage and output an output voltage, includes a first operational amplifier and a second operational amplifier. The first operational amplifier includes a first positive input, a first output and a first negative input. The second operational amplifier, coupled electrically with the first operational amplifier, includes a second positive input, a second output and a second negative input. The second positive input is used to receive the output voltage. The second output, coupled with first negative input, is used to output a second output voltage. The second negative input, coupled with the second output, is used to receive the second output voltage. After the first negative input receives the second output voltage, an offset voltage between the output voltage outputted from the first operational amplifier and the input voltage received by the first operational amplifier is close to 0.

Abstract: A power on and power down reset circuit includes a reference voltage generation module, a monitoring voltage generation module, and a voltage comparator. The reference voltage generation module is utilized to generate a reference voltage with a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a first resistance, and a second resistance. The monitoring voltage generation module is utilized to generate a monitoring voltage. The voltage comparator is utilized to generate a reset voltage by comparing the reference voltage to the monitoring voltage. Thus, the power on and power down reset circuit can achieve the effect of power savings and decreasing error rate of the reset voltage.

Abstract: A power-saving scanning method for a touch device is provided. Firstly, a controller is used to shorten a normal scanning time of a timer into a power-saving scanning time. Then, a counter is used to count the oscillating waveform within the power-saving scanning time to access a power-saving oscillating number. Afterward, the controller is used to convert the power-saving oscillating number into an (L-n)-digit M-bit count value, shift the (L-n)-digit M-bit count value toward the higher digit by n digits, and pad the lower digits with n zeros to form another L-digit M-bit count value so as to generate an M-bit oscillating number simulation value for the determination of touch operation.

Abstract: A touch system includes a circuit board, touch pads, a control chip and an insulation board. The circuit board has a conductive board body including configuration regions. The touch pads is spaced from the configuration regions by the conductive board body. Each touch pad includes at least one touch portion. The control chip includes a multiplex module coupling the touch pads and an oscillation control module coupling the conductive board body. The oscillation control module conducts alternately the multiplex module and every touch portions to utilize a work voltage for generating a voltage oscillation wave respective to each conducted touch portion. The voltage oscillation wave is transmitted to the conductive board body. When an ion-contained liquid is on the insulation board by covering partly the conductive board body and the touch portion, a capacitance effect therebetween is forming by the work voltage, but further erased by the voltage oscillation wave.

Abstract: A touch calibration system and method thereof are provided in the present invention. When a touch pad stops receiving a touch signal generated from a user to make the touch calibration system be at a calibration mode, a first step of the touch calibration method is providing a fixed count value to a counter of the touch calibration system. A second step is provided that a wave-generation module generates an oscillation wave, a counter counts an oscillation number corresponding to the oscillation wave, and a timer counts a calibration oscillation time. A third step is provided that determining whether the oscillation number achieves the fixed count value. When the oscillation number achieves the fixed count value, a storage module is received the calibration oscillation time to store the calibration oscillation time.

Abstract: An integrated circuit (IC) device includes an IC and an electrostatic discharge (ESD) protection device. The IC has a substrate, a core and a power mesh. The power mesh has a power electrode, a grounding electrode and a seal ring. The core is formed inside the grounding electrode. The power electrode is formed between the seal ring and the grounding electrode. The ESD protection device has multiple switch triggering units, multiple switching units and multiple discharging units formed on the substrate and electrically connected between the power electrode and the grounding electrode. The switching units turn on corresponding discharging units upon detecting occurrence of ESD to guide static electricity on the power electrode to the grounding electrode, thereby preventing the core from being damaged by static electricity.

Abstract: A constant current control circuit includes a sample and hold unit coupled to a current sensing resistor of a power converter, for storing a current sensing voltage of the current sensing resistor; a first capacitor for storing a comparison voltage; a discharge unit coupled between the sample and hold unit and the first capacitor, for controlling a discharge current of the first capacitor according to a reference voltage and the current sensing voltage stored in the sample and hold unit; a charge unit coupled to the first capacitor, for controlling a charging current of the first capacitor according to the reference voltage and a ground voltage; and a comparator for comparing the comparison voltage with the reference voltage to generate a comparison result, and outputting a control signal according to the comparison result, in order to control a duty cycle of the power converter.

Abstract: A semiconductor structure is arranged on an integrated circuit, the integrated circuit includes a seal ring arranged at outer periphery of the integrated circuit, a metal ring arranged at an inner side of the seal ring and a power bus arranged at a side of the metal ring. The semiconductor structure includes a first P type electrode area, a second P type electrode area and a first N type electrode area. The first P type electrode area is formed at a position on a P well corresponding to the seal ring, and coupled to the seal ring. The second P type electrode area is formed at a position on the P well corresponding to the metal ring, and coupled to the metal ring. The first N type electrode area is formed at a position corresponding to the power bus, and coupled to the power bus.

Abstract: A semiconductor structure includes a P well formed on a P type substrate; a first N type electrode area formed on a central region of the P well; a first insulating area formed on the P well and surrounding the first N type electrode area; a second N type electrode area formed on the P well and surrounding the first insulating area; a second insulating area formed on the P well and surrounding the second N type electrode area; and a P type electrode area formed on the P well and surrounding the second insulating area; wherein periphery outlines of the first N type electrode area and the second N type electrode area are both 8K sided polygons or circles, and K is a positive integer.

Abstract: A switched capacitor circuit includes a threshold detector to generate a threshold detection signal when a difference between first and second input signals crosses a predetermined level. A coarse current source produces a coarse ramp. A series sampling capacitor samples a coarse output voltage when the threshold detector indicates a first threshold crossing. The sampling capacitor is connected in series with a fine current source producing a fine ramp.

Abstract: A control circuit comprises a PWM control circuit and a PWM skip control circuit. The PWM control circuit controls a switching circuit. The switching circuit acts as a current source for an output circuit and a load circuit. The PWM skip control circuit controls the operation of the PWM control circuit. When the output current of the switching circuit is below a predetermined threshold, the PWM skip control circuit stops the operation of the PWM control circuit. When the output voltage of the switching circuit is below a predetermined threshold, the PWM skip control circuit resumes the operation of the PWM control circuit.

Abstract: A phase-locked loop circuitry includes an oscillator circuitry having an input and an output. A phase detector circuit is connected to the output of the oscillator circuitry and has outputs thereof. A digital loop filter circuit is connected to the outputs of the phase detector circuitry and has outputs thereof. The outputs of the digital loop filter circuit are coupled, through a summing circuit, to the input of the oscillator circuitry. Values associated with the outputs of the digital loop filter circuit are updated concurrently based upon values associated with the outputs of the phase detector circuitry. One output of the digital loop filter circuitry has a high-pass transfer function.

Abstract: A driving circuit for driving light emitting diodes includes a signal-extending circuit and a current sink. The signal-extending circuit is used for receiving an original dimming signal and extending a duty cycle of the original dimming signal. The current sink is coupled to the signal-extending circuit for generating a driving current for driving a series of light emitting diode.

Abstract: A low dropout regulator includes an error amplifier, an N-type depletion MOSFET, a first switch, a second switch, a low-pass filter resistor, and a low-pass filter capacitor. By switching on both the first switch and the second switch, a voltage level of an output node at a negative input terminal of the error amplifier may be rapidly raised to be close to and lower than a voltage level of an input node at a gate of the N-type depletion MOSFET. Both the first switch and the second switch are then switched off immediately so that the voltage level of the output node is gradually raised to be equal to the voltage level of the input node through the low-pass filter resistor.

Abstract: A bootstrap circuit is utilized in a bulk circuit using an NMOS transistor as a power switch. The bootstrap circuit includes a first PMOS transistor coupled between an internal power source and an offset capacitor, and a second PMOS transistor coupled between the gate of the first PMOS transistor and the offset capacitor, and an NMOS transistor coupled between the gate of the first PMOS transistor and ground. When the power switch is turned on, the second PMOS transistor is turned on for turning off the first PMOS transistor. When the power switch is turned off, the NMOS transistor is turned on for turning on the first PMOS transistor.

Abstract: A soft-start voltage circuit includes an operational amplifier, a first and a second capacitors, a first and a second switches, and a voltage level shifter. The operational amplifier includes a positive end, a negative end, and an output end coupled to the negative end of the operational amplifier for outputting the soft-start voltage. The voltage level shifter is coupled between the first capacitor and the positive end of the operational amplifier for shifting a level of the voltage on the first capacitor. The first switch is coupled between the first and the second capacitors for coupling the first and the second capacitors according to the clock. The second switch is coupled between the second capacitor and the negative end of the operational amplifier for coupling the second capacitor and the negative end of the operational amplifier according to the inverted clock.

Abstract: A PWM comprises a voltage transformation module, a voltage-sensing module and a timer. The voltage transformation module is configured to transform an input voltage into an output voltage. The voltage-sensing module is coupled to the voltage transformation module and configured to detect a voltage of a first terminal, wherein the voltage of the first terminal is proportional to the output voltage. The timer is configured to measure the time duration for which the voltage of the first terminal is lower than a reference voltage, wherein the timer initiates a short circuit signal when the time duration is greater than a predetermined value.

Abstract: A comparator based circuit with effective offset cancellation includes first and second amplifiers and an offset capacitor operatively connected to the first and second amplifiers. An offset voltage source generates an offset voltage. A first switch connects the offset voltage source to ground during a first time period. The first amplifier generates an output voltage in response to the first switch connecting the offset voltage source to ground during the first time period. A second switch connects the offset capacitor to ground during a second time period. The first switch disconnects the offset voltage source from ground during a third time period, and the second switch disconnects the offset capacitor from ground during the third time period.

Abstract: An over current protection circuit for low dropout regulator comprises a sense transistor, a sense resistor, an operational amplifier and a first transistor. The sense transistor senses the current flowing through the power transistor. The sense resistor is coupled to the sense transistor and shares the same current flowing through the sense transistor. The operational amplifier outputs a control signal according to the voltage across the sense resistor and a reference voltage. The first transistor controls the power transistor according to the control signal.