Abstract: A built-in jitter measurement circuit for a VCO (voltage-controlled oscillator) and a PLL (phase-locked loop) is disclosed. The circuit includes a divider for dividing frequency of a signal, a time to digital converter (TDC) for converting the period of the divided signal into digital values, a variance calculator for calculating variance of the period of the divided signal, a mean calculator for calculating mean value of the period of the divided signal, a encoder and counter for encoding and calculating the period of the divided signal, and a state controller as a controller for all other components. The circuit disclosed utilizes output clock of an opened-loop circuit to be measured and a divider for increasing jitter of the original signal. By measuring the bandwidth of a closed-loop circuit, accordingly, jitter of output clock of an opened-loop or an closed-loop circuit is measured by correlating the measured bandwidth and the jitter values from extrapolation.

Abstract: A temperature-homogenizing device for uniformly dissipating heat generated from electronic components in an electronic device to a housing of the electronic device includes a first and a second higher thermally conductive layers and a first lower thermally conductive layer. The first lower thermally conductive layer is disposed between the first and the second higher thermally conductive layers, and made of a material or a medium having a lower thermal conductivity than each of the first and the second higher thermally conductive layers. By means of this temperature-homogenizing device, the heat is homogeneously distributed throughout the first and the second higher thermally conductive layers at a higher thermal conduction rate and transferred through the first lower thermally conductive layer at a lower thermal conduction rate so as to maintain homogeneous temperature distribution on the housing.

Abstract: A circuit board indicator comprises a plurality of lamps with cut and bent terminals, an outer plastic holder and an inner plastic holder. The outer plastic holder contains an accommodating chamber, which has a plurality of rounded holes on a lateral side thereof. The inner plastic holder has a plurality of positioning recesses and each of the positioning recesses has a guiding slot on topside thereof. The terminals of the lamps are guided by the guiding slot and inserted into corresponding positioning recesses. The inner plastic holder further has a plurality of clamping dents to clamp corresponding lamps. The inner plastic holder has barbs on two lateral sides thereof and corresponding to rectangular grooves on the outer plastic holder. The barbs are engaged into corresponding rectangular grooves when the inner plastic holder is assembled to the outer plastic holder.

Abstract: A teaching tool for a robot arm for wafer reaction ovens is provided to anchor the robot arm with respect to a tray located inside a reaction oven. The teaching tool provides an upper flange for maintaining a spacing between a handle of the robot arm and a door of the oven, a position width for keeping the teaching tool aligning with a center line of the tray, and a lower tunnel aligning with the center line for allowing a blade of the robot arm to contact closely and horizontally from a lower position and thus for maintaining a position height between the blade and a floor of the reaction oven. By providing the teaching tool, easy blind calibration with multiple contact points between the robot arm and the oven can be performed so that possible efficiency down and cost up from an ill-calibration can be reduced to a minimum.

Abstract: A circuit board indicator comprises a plurality of lamps with cut and bent terminals, an outer plastic holder and an inner plastic holder. The outer plastic holder contains an accommodating chamber, which has a plurality of rounded holes on a lateral side thereof. The inner plastic holder has a plurality of positioning recesses and each of the positioning recesses has a guiding slot on topside thereof. The terminals of the lamps are guided by the guiding slot and inserted into corresponding positioning recesses. The inner plastic holder further has a plurality of clamping dents to clamp corresponding lamps. The inner plastic holder has barbs on two lateral sides thereof and corresponding to rectangular grooves on the outer plastic holder. The barbs are engaged into corresponding rectangular grooves when the inner plastic holder is assembled to the outer plastic holder.

Abstract: A teaching tool for a robot arm for wafer reaction ovens is provided to anchor the robot arm with respect to a tray located inside a reaction oven. The teaching tool provides an upper flange for maintaining a spacing between a handle of the robot arm and a door of the oven, a position width for keeping the teaching tool aligning with a center line of the tray, and a lower tunnel aligning with the center line for allowing a blade of the robot arm to contact closely and horizontally from a lower position and thus for maintaining a position height between the blade and a floor of the reaction oven. By providing the teaching tool, easy blind calibration with multiple contact points between the robot arm and the oven can be performed so that possible efficiency down and cost up from an ill-calibration can be reduced to a minimum.

Abstract: A rectifying device receiving a first power signal from a power source and outputting multiple power signals includes a rectifying device body receiving and rectifying a first power signal for generating a third power signal and an outlet mounted on the rectifying device body and electrically connected with the power source for supplying a second power signal. The rectifying device further includes an inlet having a plurality of conducting pieces electrically connected with the power source. The rectifying device body includes a first housing, a second housing, a circuit board positioned between the first housing and the second housing, and a connector mounted on the circuit board and electrically connected between the outlet and the inlet for transmitting the first power signal therethrough.

Abstract: Disclosed are a device and method therefor for ENOB (effective number of bits) estimation for an ADC (analog-to-digital converter) based on dynamic deviation, wherein the correlation between dynamic deviation and ENOB is analyzed so as to provide a novel device and method therefor to estimate and calculate ENOB for an ADC. Dynamic deviation, provided in the present invention, can serve as a novel parameter for use in evaluation of the performance of an ADC. The present invention further provides a model related to the relation of distribution of dynamic deviation and input frequency, wherein ENOB can be therefore predicted for higher input frequency for an ADC without a high-quality signal generator by measuring dynamic deviation for lower input frequency.

Abstract: A LED back light assembly including a light guide and a circuit board with light emitting diodes mounted within a base frame and covered by an opaque diffuser plate, wherein the light guide has a frosted top face, a frosted bottom face, a corrugated bright front face facing the light emitting diodes, two end flanges respectively coupled to upright pins at two opposite ends of the base frame, and two transverse bevel faces at two opposite ends below said end flanges adapted for guiding back diffused light rays, the corrugated bright front face defining a plurality of longitudinally arranged furrows, which receive the light emitting diodes of the circuit board respectively.

Abstract: A lens assembly including a printed circuit board having a longitudinal series of light emitting diodes, a casing mounted on the printed circuit board and covered over the light emitting diodes and having a glass cover, and a lens having a bottom side mounted on the glass cover, a plane top surface, and a sand finished, peripheral surface which confines the light of the LEDs to the plane top surface of the lens.