Abstract: An electrical connector includes an insulative housing having a mating face, a mounting face, a pair of side walls, a elongated central slot recessed downwardly from the mating face, a first end wall and a second end wall, the central slot being positioned between the side walls, the first end wall and the second end wall, the side walls include a plurality of passageways communicating with the central slot; a plurality of contacts being retained in the passageways respectively and protruding into the central slot; a metal board lock extending downwardly through the first end wall and being attached to the first end wall; a retainer attached to the first end wall to mating with a corresponding card; the board lock is sandwiched between the retainer and the first end wall.

Abstract: An electronic device includes a dynamic memory, a static memory, a detection unit, a copy unit and a set unit. The dynamic memory stores an interrupt monitoring program. The interrupt monitoring program monitors whether an interrupt request is generated, and generates an interrupt signal when the interrupt request is generated. The detection unit detects whether the electronic device needs to enter a sleep mode, and generates a detection signal if the electronic device needs to enter the sleep mode. The copy unit copies the interrupt monitoring program from the dynamic memory to the static memory in response to the detection signal, and runs the interrupt monitoring program in the static memory for monitoring whether an interrupt signal is generated. The set unit sets the dynamic memory into a self-refresh mode in response to the detection signal.

Abstract: An electronic device is provided. The electronic device is connected to an external power supply through an interface. The electronic device comprises a processing unit and an input unit. The input unit responds to a power off operation to generate a power off signal and sends the power off signal to the processing unit. The processing unit periodically checks whether the electronic device is disconnected from the external power supply after receiving the power off signal, and powers off the electronic device if the electronic device is disconnected from the external power supply.

Abstract: A probe head of vertical probe card and a manufacturing method of a composite board thereof are provided. The probe head includes guide plate, composite board, and probe pin. The composite board includes first board layer and second board layer which are laminated together by joining operation. The composite board further includes through hole which is made by drilling and passed all the way through the first board layer and the second board layer. The friction coefficient of the first board layer is less than that of the second board layer, and the thermal expansion coefficient of the second board layer is less than that of the first board layer. The probe pin is penetrated all the way through the through hole of the composite board. By this, friction between the probe pin and composite board is reduced so as to stabilize the position of the probe pin.

Abstract: A card edge connector for mating with an electronic card includes an elongated housing, a number of contacts and a retainer retained to the housing. The housing has a pair of side walls, a central slot between the side walls and a first tower upwardly extending at one end thereof. The first tower defines a first U-shaped cavity downwardly extending from a top end thereof and a mounting slot upwardly extending from a lower end thereof and located at outside of the first cavity. The first cavity communicates with the central slot along a length direction of the housing to receive the electronic card. The retainer has a non-flexible fastening portion retained in the mounting slot and a flexible locking barb obliquely protruding into the first cavity from a top end of the fastening portion to lock with the electronic card.

Abstract: A card edge connector includes a longitudinal insulative housing having a receiving slot formed therein and extending in a longitudinal direction for insertion of a module; a set of contacts retained in the insulative housing and protruding into the receiving slot for mating with the module; an ejector rotatably attached to one longitudinal end of the insulative housing for latching with or ejecting the module; and a spring member retained in the other longitudinal end of the insulative housing and having a pair of resilient locking arms for locking with the module.

Abstract: A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal. The quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal. The feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal. The subtracting unit is arranged to reduce signal input swing of the quantizer.

Abstract: An element-selecting method is utilized for selecting the converting elements of the DAC to perform the digital-to-analog conversion. The element-selecting method first determines whether the selected times of the converting elements are all equal or not. When the selected times of the converting elements are all equal, the element-selecting method determines a shifting-step according to the input signal and the number of the converting elements; otherwise, the element-selecting method determines the shifting-step to be a predetermined value. The element-selecting method then selects a converting element from the DAC by means of separating the converting element from a last selected converting element by the shifting-step. In this way, the error accumulated because of the mismatch of the converting elements is eliminated, and the toggle rate of the DAC is reduced. Hence, the glitch and the dynamic errors of the DAC are reduced, improving the performance of the DAC.

Abstract: A card edge connector includes a longitudinal insulative housing having a receiving slot formed therein and extending in a longitudinal direction for insertion of a module; a set of contacts retained in the insulative housing and protruding into the receiving slot for mating with the module; an ejector rotatably attached to one longitudinal end of the insulative housing for latching with or ejecting the module; and a spring member retained in the other longitudinal end of the insulative housing and having a pair of resilient locking arms for locking with the module.

Abstract: A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal. The quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal. The feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal. The subtracting unit is arranged to reduce signal input swing of the quantizer.

Abstract: An electrical connector includes an insulative housing having a mating face, a mounting face, a pair of side walls, a elongated central slot recessed downwardly from the mating face, a first end wall and a second end wall, the central slot being positioned between the side walls, the first end wall and the second end wall, the side walls include a plurality of passageways communicating with the central slot; a plurality of contacts being retained in the passageways respectively and protruding into the central slot; a metal board lock extending downwardly through the first end wall and being attached to the first end wall; a retainer attached to the first end wall to mating with a corresponding card; the board lock is sandwiched between the retainer and the first end wall.

Abstract: A method for reducing current consumption of digital-to-analog conversion includes: monitoring logical states of a set of differential digital inputs, wherein the set of differential digital inputs are utilized for controlling at least one tri-state current Digital-to-Analog Converter (DAC) cell of a tri-state current DAC, and the tri-state current DAC cell has a positive output current state, a zero output current state and a negative output current state; and when the logical states of the set of differential digital inputs instruct the tri-state current DAC cell should output no positive/negative current, controlling the tri-state current DAC cell to switch to the zero output current state, temporarily decreasing a direct current passing through a middle path of the tri-state current DAC cell. An associated tri-state current DAC is also provided, where the tri-state current DAC includes: the at least one tri-state current DAC cell; and a control device.

Abstract: A method for reducing current consumption of digital-to-analog conversion includes: monitoring logical states of a set of differential digital inputs, wherein the set of differential digital inputs are utilized for controlling at least one tri-state current Digital-to-Analog Converter (DAC) cell of a tri-state current DAC, and the tri-state current DAC cell has a positive output current state, a zero output current state and a negative output current state; and when the logical states of the set of differential digital inputs instruct the tri-state current DAC cell should output no positive/negative current, controlling the tri-state current DAC cell to switch to the zero output current state, temporarily decreasing a direct current passing through a middle path of the tri-state current DAC cell. An associated tri-state current DAC is also provided, where the tri-state current DAC includes: the at least one tri-state current DAC cell; and a control device.

Abstract: A card edge connector for mating with an electronic card includes an elongated housing, a number of contacts and a retainer retained to the housing. The housing has a pair of side walls, a central slot between the side walls and a first tower upwardly extending at one end thereof The first tower defines a first U-shaped cavity downwardly extending from a top end thereof and a mounting slot upwardly extending from a lower end thereof and located at outside of the first cavity. The first cavity communicates with the central slot along a length direction of the housing to receive the electronic card. The retainer has a non-flexible fastening portion retained in the mounting slot and a flexible locking barb obliquely protruding into the first cavity from a top end of the fastening portion to lock with the electronic card.

Abstract: A connector includes an insulative housing having a pair of side walls with a central slot formed therebetween, a set of terminals including first terminals and second terminals and an ejector. Each side wall has a set of passageways. Each first terminal has a first contacting portion protruding into the central slot, a first tail portion mounted on a PCB, and a first connecting portion. The first connecting portions and the first tail portions are arranged in two rows.

Abstract: A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal. The quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal. The feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal. The subtracting unit is arranged to reduce signal input swing of the quantizer.

Abstract: A data weighted average circuit is disclosed which includes a lookup unit and a storage unit. The invention uses a lookup table to speed up the circuit operation. Besides, the operation delay is not affected by various orders of the data weighted average circuit and various bit-widths of input data.

Abstract: A card edge connector (100) for receiving a module (200) includes an elongated insulative housing (1) having a receiving slot (19) for receiving the module and at least one arm portion (10) positioned at one end of the insulative housing. The arm portion (10) has a pair of side walls (11) and a recess (12) located therebetween. Each side wall has a stopper (14) extending in the recess. A sets of terminals (2) are mounted on said insulative housing and extend into the receiving slot thereof. A latch (3) is adapted to be rotatably received in the recess (12). The latch includes an ejecting portion (33) for ejecting the module out of the receiving slot, a locking portion (34) for locking the module into the receiving slot and a pair of projections (31) formed on opposite sides thereof for cooperating with the stoppers (14). The projection (31) has a side surface (312) coated with a lubricant film (315) thereon for interfering engagement with the stopper (14) when the latch is rotated inwardly.

Abstract: A convex mirror formed of a back board, a mirror, a ball head connecting rod, a ball socket, a socket cover and a mounting frame is disclosed. The back board has stub rods and retaining holes for receiving respective locating holes and hollow cylindrical posts of the ball socket to facilitate installation of rivets in affixing the ball socket and the back board together. The mirror has a rim inserted in between a rim and equiangularly spaced locating blocks of the back board to facilitate installation of self-tapping screws in affixing the rim of the back board and the rim of the mirror together.