摘要:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The output of the preprocessing stage is fed to a clock recovery stage, which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms of an interferometer, with two DFB lasers as terminuses. The output of the interferometer is an optical clock signal at the clock rate of the original input.
摘要:
A method and apparatus reduce the out-of-band frequency components of an RF amplified signal, preferably a CDMA signal, which has a carrier frequency which is not known in advance. The apparatus and method feature locating the frequency of the incoming signal by examining an RF output signal having both in-band frequency components and out-of-band frequency components. Typically the output signal is generated using a high-power, Class A/B amplifier. Once the frequency of the carrier has been determined, the out-of-band components are used to generate control signals which, in, for example, a feedback or feedforward circuitry, reduce the energy of the out-of-band signals and thereby provide a more linear amplifier transfer function.
摘要:
A linear motor and a camera module having the linear motor are provided. The linear motor includes: a piezoelectric substrate generating a vibration mode in a longitudinal direction on the basis of an applied voltage; first and second shafts coupled to both sides of the piezoelectric substrate with the piezoelectric substrate interposed therebetween; and a moving member coupled to at least one of the first and second shafts to be movable in the longitudinal direction of the first and second shafts and connected to a camera lens on one side. Accordingly, it is possible to remove a dead zone with a simple structure, to prevent an unnecessary increase in thickness, not to cause a stoppage at the time of moving a camera lens, to cause a small amount of tilt to enable a linear control, and to contribute to a decrease in thickness and a compactness of a mobile terminal.
摘要:
A system and method are used to allow high speed communication between a circuit and an external device. The system and method include a PLL with multiple phased outputs configured to be controlled digitally, a deskew PLL configured to align a clock of controller circuitry to interface circuitry, and a phase interpolated voltage controlled delay line configured to phase shift incoming signals. Analog design techniques of phase interpolation accurately position clocks and strobe signals that are required for high speed interfaces. The high speed interface is for transmitting and receiving signals from the external device, for example, a DDR DRAM.
摘要:
An objective lens driving apparatus used with an optical pickup includes a base, a holder provided on the base, a blade on which an objective lens is mounted, an elastic support body elastically supporting the blade and which is capable of moving with respect to the holder, a pair of magnetic members installed on the base to face each other, and a coil assembly including a focus coil, a tracking coil, and a tilt coil, the coil assembly being installed at the blade so as to be disposed between the magnetic members. Thus, coils needed to change the position of an objective lens are incorporated into a single coil assembly and are arranged between a pair of magnets, and an installation space is small so that the apparatus can be made compact.
摘要:
The present invention provides a low-voltage organic thin film transistor having a gate dielectric layer of ultra-thin metal oxide self-grown on a metal gate electrode by O2 plasma process. The metal gate electrode is deposited on a plastic or glass substrate. By directly oxidizing the gate electrode by using O2 plasma process, the gate dielectric layer of metal oxide is formed with a thickness of several nanometers on the gate electrode. The organic semiconductor layer is deposited on the gate dielectric layer, and source/drain electrodes are formed on the organic semiconductor layer. Before the organic semiconductor layer is formed, an organic molecular monolayer may be formed on the gate dielectric layer by using molecular self-assembly technique. The gate dielectric layer may be formed at room temperature to about 100° C.
摘要:
Provided are an encoder and/or decoder for an OCDMA (optical code division multiple access) and a method thereof. The encoder and/or decoder includes: a demultiplexer outputting multi-wavelength optical signals through paths varying with a wavelength using a plurality of first fused couplers having different coupling coefficients; and a multiplexer selecting the signals of predetermined wavelengths out of output signals from the demultiplexer using a plurality of second fused couplers symmetric to the plurality of first fused couplers and generating a PN code corresponding to the selected wavelengths.
摘要:
Provided are an apparatus and a method for reducing a signal noise of an OCDMA receiver and an OCDMA receiver and method. The includes: a clock recovery unit extracting sine wave clock from an output signal of an OCDMA decoder including an MAI (multiple access interference) noise; a time gating unit separating an auto-correlation peak signal and the MAI noise from the output signal of the OCDMA decoder using the sine wave clock; and an optical interferometer removing an SI (signal interference) noise remaining in the auto-correlation peak signal.
摘要:
Electrolysis cell comprises, in one embodiment, a proton exchange membrane (PEM), an anode positioned along one face of the PEM, and a cathode positioned along the other face of the PEM. A multi-layer metal screen for defining a first fluid cavity is placed in contact with the outer face of the anode, and an electrically-conductive, compressible, spring-like, porous pad for defining a second fluid cavity is placed in contact with the outer face of the cathode. The porous pad comprises a mat of carbon fibers bound together with one or more, preferably thermoplastic, resins, the mat having a density of about 0.2-1.5 g/cm3. Cell frames are placed in peripheral contact with the metal screen and the compression pad for peripherally containing fluids present therewithin. Electrically-conductive separators are placed in contact with the metal screen and the compression pad for axially containing fluids present therewithin. A plurality of the cells may be arranged in series in a bipolar configuration without requiring a separate compression pad between cells (for gas pressure differentials up to about 400 psi or greater). The invention is also directed to a fuel cell wherein the pad replaces the carbon fiber paper or carbon fiber cloth in contact with the cathode or anode.
摘要:
A liquid crystal display device is disclosed in the present invention. The liquid crystal display device includes a color filter substrate having a black matrix, and color filter layers at a designated region determined by the black matrix, an array substrate having a gate bus line and a data bus line crossing perpendicularly and defining a unit pixel region, a thin film transistor arranged at an intersection of the gate bus line and the data bus line, a pixel electrode contacting a drain electrode of the thin film transistor and vertically overlapping portions of the gate bus line, the data bus line, an adjacent gate bus line, and an adjacent data bus line, and an organic insulating layer on the pixel electrode and the thin film transistor, wherein a surface of the array substrate is rubbed in a 315 degree direction, and a liquid crystal layer between the array substrate and the color filter substrate.