Abstract: A position detection apparatus for detecting position information of a micro-electromechanical system apparatus includes an oscillating circuit, a carrier frequency detector, and a demodulator. The oscillating circuit generates an oscillating signal according to an equivalent capacitance provided by the micro-electromechanical system apparatus. The carrier frequency detector detects the oscillating signal to obtain a carrier frequency information of the oscillating signal. The demodulator demodulates the oscillating signal according to the carrier frequency information and thus obtains position information of the micro-electromechanical system apparatus.

Abstract: A method for returning a base station signal and a base station for implementing the method. The base station includes a first return unit located in a radio frequency system and a second return unit located in a baseband processing system. The first return unit is configured to perform analog modulation on an uplink analog signal of a first bandwidth to obtain an uplink analog signal of a second bandwidth, and send the uplink analog signal of the second bandwidth to the second return unit, where the second bandwidth is larger than the first bandwidth. The second return unit is configured to receive the uplink analog signal of the second bandwidth, demodulate the uplink analog signal of the second bandwidth to obtain the uplink analog signal of the first bandwidth.

Abstract: A projection apparatus including a micro-electro-mechanical system (MEMS) mirror module and a control unit is provided. The MEMS mirror module drives an image beam to scan along a first direction and a second direction on an imaging region. The control unit is electrically connected to the MEMS mirror module and outputs a driving signal with a corresponding pulse width according to a projection position of the image beam in the second direction of the imaging region. A projection method is also provided.

Abstract: A scanning projection system includes a scanning mirror module, a controlling circuit, and a laser module. A swinging motion of the scanning mirror module is controlled according to a driving signal, and a combined laser beam reflected by the scanning mirror module is swept across a projection surface to produce plural projection points on a projection surface. The controlling circuit includes a weight mapping unit for converting an image signal into a compensated image signal according to a position-and-weight mapping relationship. The laser module generates the combined laser beam according to the compensated image signal. After plural weights of the corresponding projection points are acquired according to positions of the corresponding projection points and the position-and-weight mapping relationship, the weight mapping unit multiplies the image signal by the corresponding weights according to the positions of the projection points. Consequently, the compensated image signal is generated.

Abstract: A method for image correction and image projection apparatus using the same are provided, where the image projection apparatus scans a projection light beam on a projection plane to form an image. The image correction method includes the following steps. A plurality of projection points of the projection light beam on the projection plane are sampled to define a projection coordinate system. An image projection area is defined on the projection coordinate system. The projection light beam is moved to scan on the projection plane and projected to the projection points sequentially. Whether the projection point is located in the image projection area is determined. When the projection point is located in the image projection area, a corrected image information is provided to the projection point.

Abstract: A graphene illuminator includes two electrodes, an accelerating electric field power supply, and several magnet sets, and further includes a graphene material used for providing free-electrons. The two electrodes are respectively disposed on both sides or at both ends of the graphene material, and meanwhile are both disposed on a plane where the graphene material is disposed; a positive electrode and a negative electrode of the accelerating electric field power supply are respectively connected to the two electrodes, to apply, in a first direction, an accelerating electric field to the graphene material; and the magnet sets are disposed on upper and lower sides of the plane where the graphene material is disposed, to generate a magnetic field perpendicular to the plane where the graphene material is disposed, and South poles and North poles of the magnet sets are arranged alternately to generate an alternating magnetic field in a second direction.

Abstract: An output over-voltage protection circuit for power factor correction, which includes a chip external compensation network, a chip external resistor divider network, a static over-voltage detection circuit, a dynamic over-voltage detection circuit and a compare circuit; The chip external compensation network is connected between the chip external resistor divider network and the dynamic over-voltage detection circuit, the chip external compensation network converts the dynamic over-voltage signal conversion to the dynamic current signal and conveys it to the dynamic over-voltage detection circuit, the dynamic over-voltage detection circuit detects the dynamic current signal and ultimately produces the dynamic over-voltage signal (DYOVP); The dynamic over-voltage signal (DYOVP) is inputted into the compare circuit, which converts the dynamic over-voltage signal (DYOVP) into a voltage compared with a reference voltage and outputs a over-voltage control signal (OVP), so as to achieve a dynamic over-voltage prote

Abstract: A radio frequency signal transceiver includes: a transmission circuit configured to perform power amplification on an input first analog signal, wirelessly transmit the first analog signal after power amplification, and output the first analog signal after power amplification to a pre-distortion circuit; the pre-distortion circuit configured to convert the first analog signal after power amplification into a second analog signal and output the second analog signal, where the second analog signal is used to feedback distortion of the first analog signal to compensate the first analog signal in advance according to the distortion; and a receiving circuit configured to wirelessly receive a third analog signal, and process and output the third analog signal. The radio frequency signal transceiver can improve efficiency in receiving and transmitting a radio frequency signal, reduce a cost of a base station system, and reduce a difficulty in implementing the base station system.

Abstract: A planar waveguide includes a top PCB, a bottom PCB, multiple shielding metal blocks, and a metal plate. The top PCB has a groove. The groove and the bottom PCB form an air waveguide. Microstrips are disposed on the lower surface of the top PCB. The microstrips are positioned at both ends of the groove and disposed along an extension line of the groove. The multiple shielding metal blocks are disposed along the extension direction of the microstrips and the groove and positioned on both sides of the microstrips and the groove. A first conversion piece for implementing signal transmission between the microstrips and the air waveguide is further disposed between the microstrips and the bottom PCB under the groove.

Abstract: A power amplifier, which includes n+1 amplifying units coupled in parallel, where n is an integer greater than or equal to 0, third input ends VR(i) of the n+1 amplifying units are coupled to a power input VL, output ends D(i) of the n+1 amplifying units are coupled to a power input VH, and an output power of the power amplifier is in an increasing function relationship with a capacitance value obtained through accumulation of energy returning capacitors xC of the n+1 amplifying units. The power amplifier changes circuit impedance in a manner of controlling the parallel capacitance value by a switching digital signal, thereby controlling a magnitude of a returned power value and forming different output powers.

Abstract: A power amplifier, which includes n+1 amplifying units coupled in parallel, where n is an integer greater than or equal to 0, third input ends VR(i) of the n+1 amplifying units are coupled to a power input VL, output ends D(i) of the n+1 amplifying units are coupled to a power input VH, and an output power of the power amplifier is in an increasing function relationship with a capacitance value obtained through accumulation of energy returning capacitors xC of the n+1 amplifying units. The power amplifier changes circuit impedance in a manner of controlling the parallel capacitance value by a switching digital signal, thereby controlling a magnitude of a returned power value and forming different output powers.