Abstract:
An amplifying circuit is provided and includes a signal processor, an edge detector, and a calibration controller. The signal processor transforms amplitude information of a first and second input signals into time domain to provide first and second output signals respectively. The edge detector detects a polarity of a voltage offset from a timing relationship of the first and second output signals. The calibration controller compensates the voltage offset according to a change of the detected polarity.
Abstract:
An amplifier includes a sigma-delta modulating circuit, a power stage circuit, two feedback components, an error suppressing circuit, and a selecting circuit. The sigma-delta modulating circuit generates two input voltages according to two input signals or one single-ended signal. The power stage circuit provides two output voltages according to the two input voltages or an error adjusting voltage. The two feedback components are respectively coupled to two output terminals of the power stage circuit and two input terminals of the sigma-delta modulating circuits. The error suppressing circuit is used for providing the error adjusting voltage according to the two input voltages. The selecting circuit selects outputs depending on whether the two input voltages corresponding to different logic levels or an identical logic level for adjusting the power stage circuit to suppress a mismatch error between the two feedback components.
Abstract:
A sigma-delta modulator includes an adder, a filter, a quantizer, and a clock rate controller. The adder receives an input signal and an output signal to generate a summation signal. The filter is coupled to the adder and filters the summation signal to generate a filtered signal. The quantizer is coupled to the filter as well as the adder and quantizes the filtered signal to generate the output signal according to a first clock signal. The clock rate controller is coupled to the quantizer and generates the first clock signal, wherein a frequency of the first clock signal is variable.
Abstract:
An illumination device having an unidirectional heat-dissipating route, includes a heat sink and a LED light module. The heat sink includes a heat plate, a heat pipe and a heat-dissipating body. The heat pipe has a heat absorbing portion and a heat dissipating portion with a horizontal position different to that of the heat absorbing portion. The heat absorbing portion is connected to the heat plate, and a plurality of grooves is formed in the heat pipe to be communicated with the heat absorbing portion and the heat dissipating portion. The heat absorbing portion is lower than the heat dissipating portion. The heat-dissipating body is connected to the heat dissipating portion. The LED light module is connected to the heat plate. Thus the LEDs are protected and prevented from being destroyed by the heat, and the working life thereof is increased greatly.
Abstract:
A luminous keyboard includes a light guide layer, a light source, a reflecting layer, a circuit layer, a key fixing plate, mechanical keys, and microstructures. The light guide layer has a first surface, a second surface, and a light incident surface. The light source generates a light beam to the light guide layer through the light incident surface. The reflecting layer is disposed beside the first surface of the light guide layer. The circuit layer formed on the second surface of the light guide layer has multiple switches. The key fixing plate is fixed to the second surface of the light guide layer. The mechanical keys are connected to the key fixing plate, corresponding to the switches, and are pressed to trigger the corresponding switches. The microstructures disposed on the light guide layer surround the switches, and guide the light beam from the light guide layer to the mechanical keys.
Abstract:
An amplifying circuit is provided and includes a signal processor, an edge detector, and a calibration controller. The signal processor transforms amplitude information of a first and second input signals into time domain to provide first and second output signals respectively. The edge detector detects a polarity of a voltage offset from a timing relationship of the first and second output signals. The calibration controller compensates the voltage offset according to a change of the detected polarity.
Abstract:
A method and a tool for manufacturing heat radiators are used to assemble a plurality of radiating fins to a heat transferring base. The method includes the steps of putting the radiating fins on the heat transferring base, putting blades between the radiating fins from at least one side of the heat transferring base, and pressing the blades to deform the heat transferring base to make the heat transferring base tightly fitted with the radiating fins. The tool includes a group of cutters and a pressing part. The cutter has blades having edges and pressing portions opposite to the edges. When the radiating fins are connected to the heat transferring base, the cutter may move between the radiating fins in a direction parallel to the heat transferring base. The pressing part is used for pressing the pressing portion to make the edges deform the heat transferring base, which forces the heat transferring base to be tightly fitted with the radiating fins.
Abstract:
In a heat sink and the manufacturing method thereof, the heat sink includes heat dissipation fins and heat pipes, and the heat dissipation fins have through holes for the heat pipes to pass through. The heat dissipating fins also have a notch formed at the peripheral of the through hole and communicating with the through hole, and openings formed at two sides of the notch, respectively. According to the manufacturing method, after the heat pipe is assembled with the heat dissipating fin, press strips pass through the openings and are pressed inwardly to reduce the notch to make the notch and the heat pipe plastically deformed. Finally the press strips are removed.
Abstract:
A heat dissipating module includes thermal conductive pipes and a thermal fin module. The thermal fin module made by pressing and stacking is mounted on the thermal conductive pipes. Next, a jig is set on a top surface of the thermal fin module, and a force compresses the thermal fin module, so as to reduce a distance between two fins of the thermal fin module. Then, a fixing plate is set above the thermal fin module on the thermal conductive pipes, and the jig is removed. Finally, the fixing plate is fixed on the thermal fin module, and the thermal fin module is securely fixed with the thermal conductive pipes. Therefore, the assembled heat dissipating module could not be loosed and deformed during delivery and the engaging contact between the fins and the thermal conductive pipes are enhanced, so to increase the heat dissipating effect of the heat dissipating module.
Abstract:
A heat dissipating device includes thermal conductive pipes and a plurality of thermal fin modules. Each thermal fin module made by pressing and stacking is mounted on the thermal conductive pipes. A retainer is located between each two thermal fin modules to compress the thermal fin module, so that a distance between two fins of the thermal fin module is reduced. Finally, a fixing plate is set above the last thermal fin module on the thermal conductive pipes to fix the thermal fin modules securely engaged with the thermal conductive pipes. Therefore, the assembled heat dissipating module could not be loosed and deformed during delivery and the engaging contact between the fins and the thermal conductive pipes are enhanced, so to increase the heat dissipating effect of the heat dissipating module.