Abstract:
PURPOSE: A receiving device for a home network modem and a receiving method therefor are provided to enhance channel equalization performance by equalizing a channel using all training signal series. CONSTITUTION: A frame synchronization recovering unit(200) recovers a frame synchronous signal from an input signal. A selecting unit(220) receives the input signal, stores the input signal and a selection signal to designate a mode for judging whether impact is generated in a transmission line. If the selection signal is an impact sensing mode, the selecting unit(220) outputs the stored input signal by the frame synchronous signal. If the selection signal is a normal reception mode, the selecting unit(220) bypasses the input signal. An equalizing unit(230) adjusts an equalization tap number on the basis of the selection signal, and equalizes the output signal of the selecting unit(220).
Abstract:
PURPOSE: An apparatus for detecting a frame of burst mode packet data and its method are provided to predict a frame end of a burst mode QAM modem accurately using one EOF detector. CONSTITUTION: According to the apparatus for detecting a frame of burst mode packet data, a down-sampling unit(11) down-samples an output of an adaptive equalizer in a symbol unit interval. A complex correlation unit(12) performs correlation using the symbol down-sampled through the down sampling unit. A threshold value detection unit(13) checks whether an output transferred through the complex correlation unit exceeds a frame end(EOF) detector threshold value given through an external control circuit or a register. The first delay unit(14) delays an output signal transferred through the threshold detection unit. A signal power measurement unit(15) obtains an average power of the signal being output through the down sampling unit and checks whether it exceeds a threshold value of a signal power measurement device given through the external control circuit or the register. The second delay unit(16) delays an output signal of the signal power measurement unit. And an EOF detection unit(17) detects an EOF flag from the first delay unit and the second delay unit.
Abstract:
PURPOSE: An adaptor for an epitaxial apparatus is provided to prevent air pollution of a vacuum chamber, by repairing broken parts or exchanging raw materials induced to the vacuum chamber while maintaining the vacuum state of the vacuum chamber and eliminating the vacuum state in a local portion. CONSTITUTION: A switching unit induces and maintains vacuum, mounted in a flange of an inlet of a vacuum chamber. A bellows-type adaptor(13) extends and contracts to eliminate only local vacuum between the switching unit and a flange of a crucible. A flange is mounted in upper and lower portion of the bellow-type adaptor. One side of a guide bar(17) is fixed in an upper flange of the adaptor, and the other side of the guide bar penetrates a lower flange of the adaptor. A length control unit(16) is mounted in the guide bar penetrating the lower flange of the adaptor.
Abstract:
A method of fabricating a heterojunction bipolar transistor having high current gain includes the steps of sequentially depositing a first conductivity type high-concentration GaAs sub-collector layer, first conductivity type low-concentration collector layer, second conductivity type base layer and first conductivity type emitter layer on a semi-insulating GaAs substrate, mesa-etching the laminated structure to form an emitter, base and collector, forming emitter, base and collector electrodes according to ohmic contact, and forming metal lines. The emitter is configured of GayIn1-yP having large energy gap to maximize the emitter injection efficiency, and the base is configured of Ge having high minority carrier concentration, low recombination current and small energy gap, to increase current gain using the energy gap difference between the GayIn1-yP emitter and Ge base.
Abstract:
The method overcomes the limit of the formation of gate which is mainly dependent on the lithography by having the length of gate set by etching and directional thin film depostion. The method comprises the steps of: forming a p-type well (2) and an activation layer (3) on the semi-insulating substrate (1) and depositing a lower thin film (4) and an upper thin film (5) sequentially; forming the pattern of a photoresist layer (6) on the upper thin film and etching the upper thin film layer sequentially; depositing directional thin film (7), lifting off the photoresist layer, and forming micro-patterns on the upper thin film sequentially; etching lower thin film, depositing gate metal (8) on the semi-insulating substrate, and depositing a low resistive metal (9) to reduce the resistance of gate sequentially; and lifting off to form the pattern of gate and etching the gate metal sequentially.
Abstract:
본 발명은 갈륨 비소 전계효과 트랜지스터를 제조하는 방법에 관한 것으로, 반절연 갈륨 비소 기판상에 1차로 이온 주입하여 증가형 영역 및 공핍형 영역을 정의하고 2차로 이온 주입하여 소오스 및 드레이영역의 오믹접촉을 위한 N + 영역을 정의한 후 전기적으로 활성화시키는 방법에 있어서, 이중으로 절연막을 증착하고 800℃, 30분 동안 고온 열처리를 수행한 것이다.