Abstract: A class-D amplifier includes a loop filter configured to receive first and second feedback signals, to receive first and second input signals through first and second resistors respectively, and to filter the first and second input signals and the first and second feedback signals to generate first and second filtered signals; a triangle wave generator configured to generate a triangle wave according to first and second reference voltages; first and second comparators configured to compare the first and second filtered signals with the triangle wave respectively to generate the first and second pulse width modulation (PWM) signals, respectively; first and second driver circuits configured to generate first and second output signals according to the first and second PWM signals, respectively; and a reference voltage generation circuit configured to generate the first and second reference voltages according to a control signal.

Abstract: An audio amplification system includes a filter circuit, a signal generation circuit, a waveform conversion circuit, a driving circuit, and a control circuit. The filter circuit is configured to generate a filtered signal according to an audio input signal, an audio output signal and a filter bandwidth. The signal generation circuit is configured to generate an oscillation signal with an oscillation frequency. The waveform conversion circuit is configured to generate a pulse-width modulation signal according to the filtered signal and the oscillation signal. The driving circuit is configured to generate the audio output signal according to the pulse-width modulation signal. The control circuit is configured to dynamically adjust the filter bandwidth and the oscillation frequency according to a digital control code. The digital control code and the audio input signal are respectively related to audio input amplitude.

Abstract: A computing system includes a chassis, a water circulation network coupled to the chassis, a power distribution network coupled to the chassis, and one or more sleds removably coupled to the chassis. The water circulation network includes a cold water distribution network and a hot water collection network. Each sled of the one or more sleds includes a corresponding cold plate. Each sled is configured to slide along the chassis in two slide directions including a slide-close direction to reach a closed position and a slide-open direction to vacate the closed position. When in the closed position, each sled is configured to (a) bridge the hot water collection network and the cold water distribution network via the corresponding cold plate and (b) couple to the power distribution network.

Abstract: An audio signal modulation and amplification circuit includes a common-mode electric potential controller, a carrier generator, and channel circuits. The common-mode electric potential controller is configured to generate one or more first common-mode electric potentials and second common-mode electric potentials. The carrier generator is adapted to receive the first common-mode electric potential to generate a carrier signal. Each of the channel circuits includes a filter, a comparison circuit, and a driving circuit. The filter is adapted to filter an input signal and generate a filtered signal based on a corresponding one of the second common-mode electric potentials. The comparison circuit is configured to compare the potential of the carrier signal with the potential of the filtered signal to generate a pulse-width modulation signal. The driving circuit is configured to be turned on or off in response to the pulse-width modulation signal to output a load driving signal.

Abstract: A computing system includes a chassis, a water circulation network coupled to the chassis, a power distribution network coupled to the chassis, and one or more sleds removably coupled to the chassis. The water circulation network includes a cold water distribution network and a hot water collection network. Each sled of the one or more sleds includes a corresponding cold plate. Each sled is configured to slide along the chassis in two slide directions including a slide-close direction to reach a closed position and a slide-open direction to vacate the closed position. When in the closed position, each sled is configured to (a) bridge the hot water collection network and the cold water distribution network via the corresponding cold plate and (b) couple to the power distribution network.

Abstract: An axial-rotation locking-mechanism assembly includes a handle, a locking assembly, and a shaft. The locking assembly includes a locking element and a cam mechanism. The shaft is operatively connected to the handle and the locking assembly. When the handle is rotated in a first direction, the shaft is rotated in a first direction and drives the cam mechanism to move the locking element in a first axial direction. When the handle is rotated in a second direction, the shaft is rotated in a second direction and drives the cam mechanism to move the locking element in a second axial direction. The second direction is the opposite of the first direction. The first axial direction is the opposite of the second direction.

Abstract: A Class-D amplifier includes a loop filter circuit, a comparator circuitry, an output circuitry, and a common-mode control circuitry. The loop filter circuit generates first and second signals according to input and output signals and adjusts common-mode levels of the first and second signals according to a first common-mode signal. The comparator circuitry respectively compares a ramp signal with the first and second signals to generate pulse signals, and a common-mode level of the ramp signal is set based on a second common-mode signal. The output circuitry is powered by a power supply voltage to generate the output signals according to the pulse signals. The common-mode control circuitry performs an AC-coupling operation on the power supply voltage to generate a noise signal and generate one of the first and second common-mode signals according to the noise signal and another one of the first and second common-mode signals.

Abstract: A light-emitting device includes a substrate including a top surface; a semiconductor stack including a first semiconductor layer, an active layer and a second semiconductor layer formed on the substrate, wherein a portion of the top surface is exposed; a distributed Bragg reflector (DBR) formed on the semiconductor stack and contacting the portion of the top surface of the substrate; a metal layer formed on the distributed Bragg reflector (DBR), contacting the portion of the top surface of the substrate and being insulated with the semiconductor stack; and an insulation layer formed on the metal layer and contacting the portion of the top surface of the substrate.

Abstract: A method of manufacturing a light-emitting element, includes: providing a base having an upper surface and a lower surface; forming a semiconductor stack on the upper surface; removing part of the semiconductor stack to form a pre-defined dicing region surrounding the semiconductor stack; forming a dielectric stack covering the semiconductor stack and the pre-defined dicing region; and applying a first laser having a first wavelength to irradiate the base along the pre-defined dicing region; wherein the dielectric stack has a reflectance of 10%-50% and/or a transmittance of 50%-90% for the first wavelength.

Abstract: A method of manufacturing a light-emitting element, includes: providing a base having an upper surface and a lower surface; forming a semiconductor stack on the upper surface; removing part of the semiconductor stack to form an isolation region surrounding the semiconductor stack; forming a dielectric stack covering the semiconductor stack and the isolation region; and applying a first laser having a first wavelength to irradiate the base along the isolation region; wherein the dielectric stack has a reflectance of 10%-50% and/or a transmittance of 50%-90% for the first wavelength.

Abstract: An axial-rotation locking-mechanism assembly includes a handle, a locking assembly, and a shaft. The locking assembly includes a locking element and a cam mechanism. The shaft is operatively connected to the handle and the locking assembly. When the handle is rotated in a first direction, the shaft is rotated in a first direction and drives the cam mechanism to move the locking element in a first axial direction. When the handle is rotated in a second direction, the shaft is rotated in a second direction and drives the cam mechanism to move the locking element in a second axial direction. The second direction is the opposite of the first direction. The first axial direction is the opposite of the second direction.

Abstract: An audio signal modulation and amplification circuit includes a common-mode electric potential controller, a carrier generator, and channel circuits. The common-mode electric potential controller is configured to generate one or more first common-mode electric potentials and second common-mode electric potentials. The carrier generator is adapted to receive the first common-mode electric potential to generate a carrier signal. Each of the channel circuits includes a filter, a comparison circuit, and a driving circuit. The filter is adapted to filter an input signal and generate a filtered signal based on a corresponding one of the second common-mode electric potentials. The comparison circuit is configured to compare the potential of the carrier signal with the potential of the filtered signal to generate a pulse-width modulation signal. The driving circuit is configured to be turned on or off in response to the pulse-width modulation signal to output a load driving signal.

Abstract: A light-emitting device includes a substrate including a top surface; a semiconductor stack including a first semiconductor layer, an active layer and a second semiconductor layer formed on the substrate, wherein a portion of the top surface is exposed; a distributed Bragg reflector (DBR) formed on the semiconductor stack and contacting the portion of the top surface of the substrate; a metal layer formed on the distributed Bragg reflector (DBR), contacting the portion of the top surface of the substrate and being insulated with the semiconductor stack; and an insulation layer formed on the metal layer and contacting the portion of the top surface of the substrate.

Abstract: A light-emitting device includes a substrate including a top surface; a semiconductor stack including a first semiconductor layer, an active layer and a second semiconductor layer formed on the substrate, wherein a portion of the top surface is exposed; a distributed Bragg reflector (DBR) formed on the semiconductor stack and contacting the portion of the top surface of the substrate; a metal layer formed on the distributed Bragg reflector (DBR), contacting the portion of the top surface of the substrate and being insulated with the semiconductor stack; and an insulation layer formed on the metal layer and contacting the portion of the top surface of the substrate.

Abstract: A vehicle lighting control circuit box is provided, including a case member, a circuit unit, at least one cover member and a positioning assembly. The case member is a metal member and extends along a longitudinal direction, the case member defines a receiving space, and two ends of the case member on the longitudinal direction respectively have an opening communicating with the receiving space. The circuit unit is received in the receiving space. Each of the at least one cover member covers one of the two openings. The positioning assembly is disposed on the case member to position the circuit unit within the receiving space to make the circuit unit contact with the case member.

Abstract: A circuit includes an input impedance, an operational amplifier, a voltage-adjusting circuit, a pulse-generating circuit, and a drive circuit. The input impedance is coupled to an input terminal of the operational amplifier, receives an input voltage, and outputs an input current. The operational amplifier is coupled to a first power voltage and outputs an amplified signal according to an input operating voltage and a feedback signal. The voltage-adjusting circuit adjusts the input operating voltage of the operational amplifier. The pulse-generating circuit generates a pulse width modulation signal according to the amplified signal. The drive circuit is coupled to a second power voltage and generates a driving signal according to the pulse width modulation signal. The feedback signal is correlated with the driving signal.

Abstract: A negative feedback system architecture and a loop filter thereof are provided. The negative feedback system architecture includes a loop filter, a pulse width modulation circuit, and a driver. The loop filter includes a three-stage series integrator for receiving a signal and outputting the filtered signal. The loop filter has three in-bandwidth poles and at least two in-bandwidth zeros. The pulse width modulation circuit is electrically connected to the loop filter for receiving the filtered signal and modulating it into a pulse width modulation signal to output. The driver is electrically connected to the pulse width modulation circuit and the loop filter for receiving the pulse width modulation signal to generate an output signal to drive a load device, and the output signal is fed back to the loop filter.

Abstract: An audio device is adapted to receive and process a digital audio signal and output an analog audio signal. The audio device includes an adder, a digital-to-analog conversion circuit, an amplifying circuit, a voltage detecting circuit and an offset compensating circuit. The voltage detecting circuit detects a supply voltage received by the amplifying circuit. The offset compensating circuit generates a DC offset compensation value according to the supply voltage. The adder adds the digital audio signal and the DC offset compensation value to output an added signal. The digital-to-analog conversion circuit converts the added signal into a converted analog audio signal. The amplifying circuit amplifies the converted analog signal to output an amplified analog signal. Accordingly, the audio device can reduce pop noise caused by a DC offset.

Abstract: A motor vehicle circuit protection device configured to be electrically connected with a power end and a load end is provided, including: a voltage pre-stabilizing unit, set with a maximum voltage value; and a trickle discharge unit, electrically connected with the voltage pre-stabilizing unit, the trickle discharge unit being configured to absorb, obviate or eliminate trickle current from the load end. A motor vehicle circuit includes the motor vehicle circuit protection device is provided, further including the power end and the load end.

Abstract: A vehicle lighting control circuit box is provided, including a case member, a circuit unit, at least one cover member and a positioning assembly. The case member is a metal member and extends along a longitudinal direction, the case member defines a receiving space, and two ends of the case member on the longitudinal direction respectively have an opening communicating with the receiving space. The circuit unit is received in the receiving space. Each of the at least one cover member covers one of the two openings. The positioning assembly is disposed on the case member to position the circuit unit within the receiving space to make the circuit unit contact with the case member.