Abstract:
A circuit of a scanner to perform a color space conversion on an RGB signal. The circuit has several sampling-amplified-offset devices to sample, amplify and compensate potential of an R charge signal, a G charge signal and a B charge signal to obtain an R analog signal, a G analog signal and a B analog signal. The circuit further has a gain adder to multiply the corresponding weighted gain with the R analog signal, the G analog signal and the B analog signal. The multiplication results are then summed up to obtain an addition analog signal. A multiplexer is also included to select between the R analog signal, the G analog signal, the B analog signal and the addition analog signal for output.
Abstract:
A system for automatically calculating parameters of an MOSFET is disclosed. The parameter calculating system runs in a computer. The parameter calculating system is used for receiving values input by the users, and for calculating parameters of the MOSFET according to the input values. The parameter calculating system includes a type selecting module (110), a value receiving module (120), a number determining module (130), a parameter calculating module (140), and a circuit netlist generating module (150). A related method is also disclosed.
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 power supply device includes a power supply unit and a feedback control unit. The power supply unit is configured for generating an electric potential to be provided to a load. The feedback control unit detects the electric potential and adjusts relevant parameters of the electrical potential to achieve predetermined values. The feedback control unit includes a first feedback circuit and a second feedback circuit electrically connected in series.
Abstract:
A printed circuit board (PCB) includes a power layer and a signal layer. A signal line is arranged on the signal layer. A power via extends through the power layer and the signal layer, and is electrically connected to the power layer and the signal layer. A number of through holes is defined in the PCB, through the power layer and the signal layer, and arranged between the signal line and the power via. The through holes are insulated from the power via. The inside wall of the power via is made of conductive material.
Abstract:
A computing device reads a printed circuit board (PCB) layout file from a storage device. The PCB layout file includes arrangement information of signal lines, power lines, and power through-holes arranged on a PCB. Furthermore, the computing device sets a reference distance between a selected power through-hole and a neighboring signal line, and searches for one or more line segments of one or more signal lines where the a distance between each of the one or more line segment and the selected power through-hole is less than the reference distance.
Abstract:
An injection-locked frequency divider is provided and which includes an injection transistor, an oscillator, a current source and a transformer. The injection transistor is used to receive an injection signal. The oscillator is used to divide the injection signal to generate a divided frequency signal. The current source is coupled to the oscillator to provide a current to the oscillator. The transformer is coupled between the injection transistor and the oscillator to increase the equivalent transconductance of the injection transistor, and thus increasing the locking range of the injection-locked frequency divider.
Abstract:
In a method for inspecting the layout of a printed circuit board (PCB), a component to be checked is determined from an electronic layout diagram of the PCB, and a power transmission line which may be serving that component is selected. The layout diagram is checked to determine whether the component is connected to the power transmission line, and further checked to determine whether more than one ground pins of the component is connected to the power transmission line. Vias that are shared by two or more ground pins of the component are determined if more than one ground pin is connected to the power transmission line. Shared vias are marked on the layout diagram.
Abstract:
A printed circuit board (PCB) can prevent electrostatic discharge. A number of vias are embedded in the PCB. A circular insulated member is disposed between each via and the number of vias. Each via includes a layer of metal coated on an inner wall of a corresponding insulated member and a through hole bounded by the corresponding insulated member. An acute angle between two tangents which pass through a point of intersection of two overlapped insulated members is greater than twenty degrees.
Abstract:
A printed circuit board includes a first circuit area, a second circuit area, a plurality of connectors, and a connecting terminal. The first circuit area is electrically connected to the second circuit area via the connectors. The connecting terminal is placed on one side of the first circuit area for electrically connecting with a load. An imaginary center line of the connecting terminal is perpendicular to the one side of the printed circuit board. The less a horizontal distance between the center line of connecting terminal and one of the connectors, the larger a vertical distance between the side of the printed circuit board and the one of the connector.