摘要:
The voltage control generator for a semiconductor device is disclosed, in which the substrate bias voltage through the oscillation period of the step-up voltage generator circuit are quickly adjusted with respect to the level variation of a corresponding voltage. The circuit according to the present invention includes a control level generator generating at least one control signal for detecting a substrate bias voltage level from a substrate of a semiconductor device and adjusting the width of an oscillation period to a set level in accordance with the detected signal, a voltage control oscillator generating a signal in which the width of an oscillation period is varied to the set level in response to an output signal from the control level generator, and a charge pump supplying a stable bias voltage to the substrate of the semiconductor device by increasing or decreasing a pumping speed in response to an output signal from the voltage control oscillator. Since the voltage control oscillator is used as an oscillator for determining the pumping period of the charge pump, it is possible to effectively control the oscillation period in accordance with the detected voltage level variation for thereby decreasing the power consumption.
摘要:
Disclosed are a hollow fiber membrane module, a filtration apparatus based on the same, and a method for manufacturing the filtration apparatus. The hollow fiber membrane module includes two headers respectively provided with a permeate collecting unit therein, wherein each of the headers has grooves on its two sides, the grooves being extended in a length direction of the hollow fiber membrane. Since one slide rod can simultaneously be inserted into grooves of two adjacent hollow fiber membrane modules, the hollow fiber membrane modules can mutually serve as guides for insertion/ejection thereof. Also, since the grooves formed on the header can serve as insertion holes into which a clamp is inserted, the clamp can be used for coupling between the hollow fiber membrane module and another element and reinforcement of the coupling.
摘要:
Disclosed is an energy-saving and eco-friendly filtration system which is capable of minimizing the amount of the energy required for the filtration, thereby remarkably reducing the cost of water treatment. The filtration system of the present invention comprises: a feed water tank for storing a feed water to be treated; a hollow fiber membrane module for filtering the feed water supplied from the feed water tank; and a filtrate tank for storing a filtrate produced by the hollow fiber membrane module, wherein the hollow fiber membrane module comprises a plurality of hollow fiber membranes for filtering the feed water, and the sum of head pressure of the feed water in the feed water tank and water pressure of the filtrate in accordance with siphon principle is higher than the threshold membrane pressure of the hollow fiber membranes.
摘要:
Disclosed are a filtration apparatus having the advantages of conventional pressurized-type and submerged-type filtration apparatuses and a hollow fiber membrane module therefor. The filtration apparatus of the present invention comprises: a tank into which feed water is to be introduced, the tank comprising first and second inner step surfaces arranged opposite to each other; and a hollow fiber membrane module to be submerged in the feed water introduced in the tank, the hollow fiber membrane module comprising first and second headers and a hollow fiber membrane therebetween, wherein first and second ends of the first header are supported by the first and second inner step surfaces respectively.
摘要:
The present invention relates to an acrylic impact modifier having a multilayered structure, which offers both superior impact resistance and coloring characteristics to engineering plastics, such as polycarbonate (PC) and a polycarbonate/polybutylene terephthalate alloy resin, or to a polyvinyl chloride resin. The present invention provides an acrylic impact modifier having a multilayered structure comprising: a) a seed prepared by emulsion copolymerization of a vinylic monomer and a hydrophilic monomer; b) a rubbery core surrounding the seed and comprising a C2 to C8 alkyl acrylate polymer, and c) a shell surrounding the rubbery core and comprising a C1, to C4 alkyl methacrylate polymer, a method for preparing the same, and a thermoplastic resin comprising the same.
摘要:
A synchronous mirror delay circuit comprises a delay monitor circuit for delaying a reference clock signal from a clock buffer circuit. A forward delay array sequentially delays an output clock signal of the delay monitor circuit to generate delay clock signals, and the mirror control circuit detects a delay clock signal synchronized with the reference clock signal among the delay clock signals. A backward delay array delays a clock signal delayed by the mirror control circuit, and a clock driver receives an output clock signal of the backward delay array to generate the internal clock signal. A locking range control circuit controls a delay time of each clock signal transferred to the delay monitor circuit by the amount of a delay time of each signal transferred to the clock driver when none of delay clock signals of the forward delay array is synchronized with the reference clock signal.
摘要:
A method and device for maintaining data coherency in a semiconductor memory device, having two or more memory chips combined into one chip and operated according to a late select synchronous pipeline type input/output protocol. A method includes the steps of generating first and second bypass summation signals by utilizing a chip block select address signal inputted in a latest write operation and comparison signals obtained from comparison between a latest write address and a current read address; and generating first and second bypass control signals having logic values contrary to each other by utilizing the first and second bypass summation signals and an internal clock signal, wherein a bypass operation is performed in one of read paths associated with the memory chips and a normal read operation is performed through other read paths when all the comparison signals are same.
摘要:
An apparatus for controlling an enable of a sense amplifier in a semiconductor memory device includes a test part for repeatedly varying a test code value until the enable of the sense amplifier has a zero margin with respect to data to be read by the sense amplifier, and for determining the test code value at a time point when the enable has the zero margin. A fuse array cuts a fuse corresponding to the determined test code value.
摘要:
Disclosed is a level shifter that can receive and convert a first signal that can have various voltage logic levels to a second signal having internal voltage logic levels. The level shifter includes first and second ascending/descending circuits, where the first ascend/descending circuit receives the first signal and the second ascend/descending circuit receives an inverted first signal. Each ascend/descending circuit is operable to descend a high logic level of the received signal to a low output voltage level and ascend a low logic level of the received signal to a high output voltage level. The output voltages from the first and second ascending/descending circuits are input to a sense amplifier that amplifies the difference between the output voltages in order to generate the internal voltage logic levels of the second signal. The first and second ascending/descending circuits buffer their respective received signals using the high logic level of the input signal as a supply voltage. The same principles are also applicable to the level shifting from internal voltage logic levels to external voltage logic levels.
摘要:
A system and method for filtering is disclosed, which is capable of accomplishing a filtering operation at a high recovery rate of 96% or more, and realizing a compact and simplified system structure, the system comprising a water bath including an inlet and a discharging hole, wherein feed water to be treated is supplied to the inside of the water bath through the inlet, and concentrated water is discharged out through the discharging hole; and plural membrane cassettes including first and second membrane cassettes submerged into the feed water contained in the water bath, wherein the first membrane cassette is positioned nearest to the inlet, and the second membrane cassette is positioned nearest to the discharging hole, wherein the first membrane cassette treats the feed water with a first impurity concentration; the second membrane cassette treats the feed water with a second impurity concentration; and the first impurity concentration is smaller than the second impurity concentration.