baber/WOPTO huggingface dataset:
Patent KR-19980080645-A (KR)
Title: 광학 기록 매체 및 광디스크 장치
IPC: G11B7/1372
Filed: 1998-03-25
Abstract: 본 발명에 따른 광학 기록 매체는 레이저 광이 입사하는 쪽의 표면 위에 형성된 정보 신호부 및 지지층에 형성된 광투과층을 포함한다.  광투과층의 두께 t는 최소한 정보 신호부에서 t= 3 내지 177㎛의 범위에 속한다.  광투과층의 오차를 Δt라 하면, 재생 또는 기록 및 재생을 위한 광학 시스템의 N.A. 및 파장 λ는 Δt ≤ ±5.26(λ/N.A. 4 )(㎛)를 만족한다.  트랙 피치를 P로 하고, 스큐(skew)를 Θ로 하면, P ≤0.64 ㎛이고 Θ ≤ ±84.115°(λ/N.A. 3 /t)를 만족한다.  광학 기록 매체는 λ ≤0.68 ㎛ 및 N.A./λ≥1.20 을 만족하는 기록 및 재생 시스템에 의해 기록되고 재생된다.  광학 기록 매체는 8 GB의 기록 용량을 허용한다.
Patent KR-19990075939-A (KR)
Title: 세탁기
IPC: D06F39/12
Filed: 1998-03-26
Abstract: 본 발명은, 세탁기에 관한 것으로서, 수직축선에 대해 원통상으로 형성되어 세탁물 및 세탁수를 수용하며 저부에 다수의 세탁수유출공이 형성되어 있는 세탁조와; 상기 세탁수유출공을 통해 상기 세탁조내의 세탁수를 인출하는 세탁수인출수단과; 상기 세탁수인출수단에 의해 인출된 세탁수를 상기 세탁조로 복귀시키는 적어도 하나의 세탁수순환유로와; 상기 세탁수유출공의 상측에 마련되어 상기 세탁물을 상기 세탁조의 저면으로부터 이격유지시키는 이격유지부재를 포함하는 것을 특징으로 한다.  이에 의하여, 세탁물의 엉킴을 방지할 수 있을 뿐만 아니라 세탁물의 손상을 줄일 수 있는 세탁기가 제공된다.
Patent KR-19980080723-A (KR)
Title: 액체시료 성분의 분리방법 및 그 방법에 사용하는 장치
IPC: G01N30/16
Filed: 1998-03-26
Abstract: 본 발명은 시료도입부를 세정액으로 세정하지 않더라도 캐리오버를 피할 수 있음과 동시에, 다수의 액체시료를 동일한 분리기구를 사용하여 다수회 분리해도 칼럼의 압력이 상승하거나 분리가 나쁘게 되는 현상을 피할 수 있는 액체시료 성분의 분리방법 및 그 방법에 사용하는 분리장치를 제공하는 것을 목적으로 한다. 
     본 발명은 액체시료를 흡착제를 보유한 분리기구의 용출방향과는 역방향으로부터 분리기구로 도입하여 용리액과 함께 용출선단으로부터 분리용출시킴으로써, 미량의 불용물과 시료도입로에 부착한 시료를 용출조작에 의해서 제거할 수 있으므로, 캐리오버와 칼럼이 막힘으로써 칼럼의 압력이 상승하거나 분리가 나쁘게 되는 현상을 피할 수 있도록 한 것을 특징으로 한다.
Patent KR-19990079964-A (KR)
Title: 반도체의 적층형 패키지의 제조방법
IPC: H01L23/48
Filed: 1998-04-10
Abstract: 본 발명에 의한 반도체의 적층형 패키지의 제조방법은 다이에 형성한 다수개의 다이포켓에 패키지를 삽입한 후, 다이의 상부에 패키지 정렬마스크를 씌우는 단계와, 상기 패키지 정렬마스크의 상부에 설치한 솔더패이스트노즐을 통해 패키지 정렬마스크 사이로 노출된 패키지의 리드 상면에 솔더 패이스트를 도포하는 단계와, 상기 솔더패이스트가 도포된 패키지의 상부에 진공흡착기로 흡착된 적층패키지를 실장한 후 리플로우를 시키는 단계와, 상기 리플로우된 적층형 패키지를 다이포켓으로부터 분리하는 단계의 순으로 진행되어, 솔더량을 조절할 수 있기 때문에 패키지의 아웃리드간에 접촉을 방지할 수 있으며, 적층된 패키지의 높이가 낮아 패키지의 경박단소의 요구에 부응할 수 있도록 하였다.
Patent KR-19990080776-A (KR)
Title: 주사전자현미경 관찰용 시료 제작방법
IPC: G01N31/22
Filed: 1998-04-21
Abstract: 본 발명은 전도층을 형성할 때 금속과 절연층이나 확산층과의 접촉저항을 감소시키고 절연층의 확산을 방지하기 위해 형성되는 장벽금속층, 특히 TiN/Ti층의 형성 상태를 주사전자현미경에 의해 관찰하기 위한 시료를 제작하는 방법에 관한 것으로, 특정극성에 시료를 부착시키고 전해액에 담궈 전기분해시킴으로서 관찰하고자 하는 물질의 골격만을 남기도록 하는 방법과 RIE 건식식각으로 관찰하고자 하는 물질만을 식각하는 방법으로 관찰하고자 하는 물질과 다른 물질간의 대조차를 극대화 시켜 주사전자현미경으로 촬영시 선명한 영상을 얻을 수 있도록 한다는 이점이 있다.
Patent KR-20000000516-A (KR)
Title: Can cooling method and cooling can having cooling function of itself
Inventor: KIM KYUNG HEE
IPC: F25D3/10
Filed: 1998-05-16
Abstract: PURPOSE: A can cooling method and a cooling can including a cooling function are provided to keep contents at a colder temperature than a refrigerator. CONSTITUTION: A can cooling method and the cooling can including a cooling function comprises the steps of:cooling a can after storing in the refrigerator or storing a liquor-state-coolant in a range of 4°C plus or minus 6°C in the can; and executing the second step of cooling as gasifying a gas-state-coolant in the can after cooling as the first step up to the refrigerating temperature.
Patent KR-20000001426-A (KR)
Title: Adsorption takeout apparatus for glass
Inventor: GWAK HWI SEOP
IPC: C03B11/00
Filed: 1998-06-11
Abstract: PURPOSE: An apparatus for taking out glass is provided to spray cooling air to glass for reducing the consumption of compressed air. CONSTITUTION: The apparatus comprises an adsorption member(11) to be absorbed on the surface of glass, a venturi member(15) connected to be communicated to the adsorption member(11), a cooling spray nozzle(17) for spraying discharged air through the venturi member(15). The adsorption member(11) consists of a circular adsorption pad(12) and a supporting bracket(13) in which a vent hole is formed respectively along a central axial line, the supporting bracket(13) is connected to be communicated to the 1st connecting pipe(21). The 2nd connecting pipe(23) is connected to the 1st connecting member(31) to be at right angle to the 1st connecting pipe(21) at its one end and its another end is connected to be communicated to the venturi member(15). One end of the venturi member(15) is connected to one side end of the 3rd connecting pipe(25) and its another side end is connected to the 2nd connecting member(33) like the letter"L" in shape, which is connected to the 4th connecting pipe(27).
Patent KR-20000002637-A (KR)
Title: Hemi-spherical grain(hsg) forming of lower electrode of capacitor having higher growing temperature than seeding temperature
Inventor: PARK JOON SIK
IPC: H01L27/108
Filed: 1998-06-22
Abstract: PURPOSE: A hemi spherical grain(HSG) seeding method of lower electrode of a capacitor is provided to improve the cell capacitance and to shorten the heat processing hour. CONSTITUTION: A hemi spherical grain seeding method using a semiconductor comprises the steps of: standing by the temperature of a chamber of the semiconductor to be the first temperature condition; loading a wafer to the chamber and stabilizing the inside of the chamber at the first temperature condition; HSG seeding the loaded wafer at the second temperature condition; and annealing to seed HSG of the wafer by changing the chamber to the third temperature condition higher than the temperature condition.
Patent KR-20000004521-A (KR)
Title: Comparing circuit for parallel test
Inventor: KIM YEONG SEOK
IPC: G11C29/00
Filed: 1998-06-30
Abstract: PURPOSE: The circuit is to minimize a layout size and a current consumption when a parallel test is performed. CONSTITUTION: The comparing circuit for parallel test comprises first and third exclusive NOR circuits for comparing and outputting 2 data to be inputted, a second exclusive NOR circuit, controlled by a signal from the first exclusive NOR circuit, for comparing and outputting 2 data to be inputted, and a fourth exclusive NOR circuit, controlled by signals from the second and third exclusive NOR circuits, for comparing and outputting 2 data to be inputted.
Patent KR-20000010360-A (KR)
Title: Color picture tube for preventing howling phenomenon
Inventor: KANG TAEK HO
IPC: H01J29/07
Filed: 1998-07-31
Abstract: PURPOSE: A color picture tube for preventing howling phenomenon is provided to minimize horizontal vibration of a slit(31) and reproduce clear image. CONSTITUTION: The present invention discloses the color picture tube for preventing howling phenomenon comprising: an electron gun(10) for scanning an electron beam; a panel(20) having a fluorescent film(21) being lightened in being scanned the electron beam; a shadow mask(30) mounted on inner side of the panel, and accurately radiating the electron beam to the fluorescent film; and a frame(40) supporting the shadow mask so as not to be in resonance by the vibration of an inner speaker. The frame is supported by plural leaf spring(45) mounted between a surface perpendicular to the slit of the shadow mask and the inner face of the panel.
Patent KR-20000013503-A (KR)
Title: Voltage generation apparatus and method for driving liquid crystal display panel
Inventor: LEE SEONG WOO
IPC: G09G3/36
Filed: 1998-08-10
Abstract: PURPOSE: A voltage generation apparatus and method for driving liquid crystal display panel are provided to reduce current consumption. CONSTITUTION: The apparatus comprises a divider for dividing a frequency of an inputted reference clock signal into a plurality of frequencies, a selector for selecting one of the clock signals in response to a select signal and outputting the selected signal, a controller for encoding a plurality of control signals generated according to size of a liquid crystal display panel and outputting the encoded signal as the select signal, and a frequency multiplier for inverting a phase of the selected clock signal, multiplying a first reference voltage in response to the inverted clock signal and generating the multiplied voltage as driving voltage to drive the liquid crystal display panel.
Patent KR-20000014887-A (KR)
Title: System for automatically collecting a gas rate
Inventor: YU YONG CHUN
IPC: G08C19/00
Filed: 1998-08-25
Abstract: PURPOSE: A system for automatically collecting a gas rate is provided, which can automatically collect a gas use rate without a collector. CONSTITUTION: The system for automatically collecting a gas rate comprises: a gas using amount detecting sensor (20) for detecting a gas using amount information in a gas meter (1); a controller (100) for counting a gas using amount based on the output signal of the gas using amount detecting sensor (20), computing the gas using amount as a using rate based on a rate information of a rate database, and processing the gas using rate; a gas rate card (300) for paying the gas using rate; a gas rate card processing device (200) for adjusting the rate information to the gas rate card (300); and a gas closer (10) for closing a gas tube in a front and rear of the gas meter (1) based on the gas closing signal of the a gas rate automatic processing and controlling unit (100). Thereby, it is possible to decrease the loss of the human strength.
Patent KR-19990029753-A (KR)
Title: 반도체장치 및 그 제조방법
IPC: H01L21/285
Filed: 1998-09-12
Abstract: 본 발명의 목적은, 다른 층의 전극 및 배선층 사이 또는 그 배선층 사이의 신뢰성있는 전기적 접속을 실현해주는 반도체장치의 제조방법을 제공하는데 있다. 
     본 발명의 제1관점에 따라, 반도체장치의 제조방법은, 기판(50)의 주표면상에 소자분리영역(51)을 형성하는 단계와, 게이트전극(53)을 형성하는 단계와, 소스 및 드레인전극(56)을 형성하는 단계와, 반도체기판(50)의 주표면상에 질화물 절연막(57)을 형성하는 단계와, 1개 이상의 접속홀(H)을 가진 층간절연체(58)를 형성하는 단계와, 접속홀(H)의 하부에서 질화물 절연막(57)의 일부를 절연성 질화물보다 결합 에너지가 높은 도전성 질화물막(61)으로 교환하는 단계 및 도전성 질화물막(61)을 통해 소스/드레인전극(56)에 접속된 배선층(62)을 형성하는 단계를 포함한다.
Patent KR-20000019759-A (KR)
Title: Method for requesting retransmission in internet fax
Inventor: LEE YOUNG SU
IPC: H04L12/28
Filed: 1998-09-15
Abstract: PURPOSE: A method for requesting a re-transmission in an internet fax is provided to reduce a capacity of transmission data and a communication cost by using a page number of Tag Image File Format(TIFF) file. CONSTITUTION: A method for requesting a re-transmission in an internet fax comprises the steps of: receiving a fax data having a predetermined form; determining whether the received fax data exceeds a memory capacity of a receiving unit, or not; printing the current received fax data if the received fax data exceeds the memory capacity of the receiving unit, obtaining information related to not received fax data, and transferring the information to a transmitting unit by a predetermined method. The predetermined form has a structure of TIFF. The predetermined method is to transmit a page number value of an Image File Directory(IFD) through an E-mail.
Patent KR-20000020367-A (KR)
Title: Multi-stage control method of air bag for vehicle and device thereof
Inventor: BAE YUN GEUN
IPC: B60R21/16
Filed: 1998-09-21
Abstract: PURPOSE: A multi-stage control device of an air bag for a vehicle is provided to be equipped plural inflator having different radiating pressures in one air bag, and to operate the air bag in a multi-stage by selectively operating plural inflator by comparing the shock speed of vehicle in an accident. CONSTITUTION: A sensor for detecting a shock detects a speed of shock generated at an accident of a vehicle, and a first and a second inflator radiates different pressures into one air bag. A control unit(20) selectively operates plural inflator by comparing the speed of shock detected from the detection sensor of shock.
Patent KR-19990030105-A (KR)
Title: 알칼리 축전지용 비소결식 니켈극 및 그를 포함하는 알칼리 축전지
IPC: H01M10/30
Filed: 1998-09-24
Abstract: 본 발명은 활성 물질 분말이 복합체 입자로 이루어지고, 이 복합체 입자가 수산화니켈을 함유하는 기본 입자와, 이 기본 입자를 피복하는 비스무스 함유 화합물로 이루어지는 피복층으로 구성되거나, 또는 수산화니켈을 함유하는 기본 입자와 이 기본 입자를 피복하는 비스무스 함유 화합물로 이루어지는 피복 내층과, 이 피복 내층을 피복하는 금속 코발트, 일산화코발트, 수산화코발트, 옥시수산화코발트, 또는 금속 코발트, 일산화코발트, 수산화코발트 혹은 옥시수산화코발트에 수산화나트륨 수용액을 첨가하고, 산소 존재하에서 가열 처리함으로써 제조된 나트륨 함유 코발트 화합물로 이루어지는 피복 외층으로 구성되는 알칼리 축전지용 니켈극 및 그를 포함하는 알칼리 축전지를 제공한다. 
     따라서, 본 발명에 의해 상온하에서 충전했을 경우는 물론, 고온하에서 충전했을 경우에도 활성 물질 이용율이 높고, 또한 충방전 사이클 특성이 좋은 알칼리 축전지용 비소결식 니켈극 및 그를 포함하는 알칼리 축전지가 제공된다.
Patent KR-20000025070-A (KR)
Title: Modeling system of application developing tool based on object-oriented framework
Inventor: YANG YOUNG JONG
IPC: G06F9/44
Filed: 1998-10-08
Abstract: PURPOSE: A modeling system of an application developing tool provides a previous analysis and design information necessary to realize a framework based RAD tool by defining a structure of the RAD tool, a function of each module and a data flow after modeling the function of the RAD tool. CONSTITUTION: In a modeling system of an application developing tool, a data storage region(130) is composed of a target system OOA/D storage region(131), a framework storage region(132), a class storage region(133) and an application software storage region(134). A framework based modeler(100) receives data from the framework and class storage regions, and outputs edited data to the target system OOA/D storage region. An application generator(110) receives data from the target system OOA/D, the framework, and the class storage region to output an initial application source code. An application realizing circumstance(140) receives the initial application source code to output a final application source code to the application software storage region. A data storage region manager(120) manages the data stored in the framework storage region and the class storage region.
Patent KR-20000025433-A (KR)
Title: Driving apparatus for rotating wafer holder
Inventor: AHN HYUNG JUN
IPC: H01L21/02
Filed: 1998-10-12
Abstract: PURPOSE: A driving apparatus for rotating a wafer holder is provided to supply a reliable driving force for a long time by overcoming a pressure difference between atmosphere and high vacuum. CONSTITUTION: A driving apparatus for rotating a wafer holder relates to a driving apparatus for driving a wafer holder disposed to a chamber at a state of high vacuum by using a driving force generated from atmosphere. To transfer the driving force to the wafer holder, a ferro fluidic spindle(8) is connected to a rotation axis(4a) of a wafer holder(4) for penetrating a vacuum chamber. A pulley(8a) of the ferro fluidic spindle is connected to a pulley of a driving motor by using a belt(10).
Patent KR-20000026362-A (KR)
Title: Method for manufacturing capacitor using supplementary layer
Inventor: CHO HAK JU
IPC: H01L27/10
Filed: 1998-10-20
Abstract: PURPOSE: A method for manufacturing a capacitor using a supplementary layer is provided to prevent a non-standard crystallization of a PZT(Pb(Zr,Ti)O3) layer by using a supplementary layer. CONSTITUTION: A method for manufacturing a capacitor using a supplementary layer comprises the steps of: forming an interlayer dielectrics(42) on a substrate(40); forming a contact hole(44) on the interlayer dielectrics; filling a conductive plug to the contact hole; forming a first conductive layer(48) on the interlayer dielectrics comprising the conductive plug; forming a first dielectric layer(50) on the first conductive layer; forming a second dielectric layer as a supplementary layer(52) on the first dielectric layer; and forming a second conductive layer(54) on the second dielectric layer.
Patent KR-20000032893-A (KR)
Title: Method for controlling universal time in video telephone
Inventor: KIM JOON SEON
IPC: H04N7/14
Filed: 1998-11-18
Abstract: PURPOSE: A method for controlling universal time in a video telephone is provided to display the current time of a country (and/or area) by recognizing the corresponding country from its input number when the telephone number of the country and/or area of a person on the other side with which video communication is to be carried out is dialed in the video telephone. CONSTITUTION: Current time information of countries and/or areas all over the world are constructed as a database. The country and/or area of a person on the other side and the current time thereof are displayed on a monitor(LCD) screen by recognizing the country and/or area of the person on the other side from an input number to be dialed and calculating the current time of the corresponding country and/or area.
Patent KR-20000038562-A (KR)
Title: Fabrication method of junction soi wafer
Inventor: JEONG HAE DO
IPC: H01L21/20
Filed: 1998-12-08
Abstract: PURPOSE: A junction SOI wafer is provided so as to grind uniformly a surface of a single crystalline silicon by a fixed thickness when preparing a wafer by the junction of a single crystalline silicon; so as to reduce a deflection of the thickness and evenness for the junction wafer; and so as to inhibit the occurrence of a defect between the combined mono-crystalline silicon(10 20). CONSTITUTION: A fabrication method of a junction SOI wafer consists of the following processes; a fabrication process of a single crystalline silicon being prepared the single crystalline silicon(10, 20), which form the oxide layers(11,12) individually on the substrates, have a larger diameter than the diameter of when completing; a junction process combing to face with each other the above oxide layers(11, 12) of the single crystalline silicon(10, 20) that were prepared at the above process; a heat treatment process of the above combined mono-crystalline silicon in a pressure; and a grinding process of the above single crystalline silicon which were combined and treated in heat.
Patent KR-20000038751-A (KR)
Title: Preparation method of paste sauce for spaghetti
Inventor: OH GEA BACK
IPC: A23L23/00
Filed: 1998-12-09
Abstract: PURPOSE: A preparation method of paste sauce of spaghetti is provided, which is good for circulation and cheap and which has simple process of preparation and has better taste than retort products, which has 30-60% water content, less than 5% saltness, pH 4.5-5. CONSTITUTION: A process of preparation method of paste sauce of spaghetti is composed of several steps. A first step is roasting grinded and vegetables added 5-15% wt oil. A second step is adding 2-20% wt seafood or meat, 10-50% wt source from tomato, 1-5% wt spices, 0.1-5% wt flavorings, 5-20% wt sweeteners and is heating the mixture for 5-30 minutes at 80-100°C. A third step is adding 3-10% wt vinegar to heated mixture.
Patent KR-20000039387-A (KR)
Title: Apparatus for separation of solid from liquid of sewage or waste water
Inventor: JONG HYONG KUN
IPC: B01D33/00
Filed: 1998-12-12
Abstract: PURPOSE: An apparatus for the separation of solid of sewage or waste water using a centrifugal separator is provided which separates solid from liquid with ease and collecting by inducing sewage or waste water to a rotating filter and dehydrating. CONSTITUTION: In the apparatus comprising a drum with a filter, a rotation unit of a drum, a sewage or waste water supply apparatus, a solid separating apparatus, and a solid discharging apparatus, the drum (1) is formed into the monolithic construction constituting the upper and lower part opening and having an overflow prevention part (11)(12) at its lower and upper part wherein sewage or waste water can not remain, the sewage or waste water supply apparatus (4) has a guiding device (7) which guides sewage or waste water to an inner circular surface at its front end part,
Patent KR-20000041176-A (KR)
Title: Method for recording/playback of magnetic recording medium for long time
Inventor: HONG SEONG HYEON
IPC: G11B15/02
Filed: 1998-12-18
Abstract: PURPOSE: A magnetic recording/playing method of long time is provided to prevent an omission of an important image signal and to improve the economical efficiency by increasing a density of image signal recorded in a tape. CONSTITUTION: A magnetic recording medium is traveled at a low speed under 1/5 of a reference traveling speed. An inputted outer image signal is processed with a field unit. The signal-processed image signal is outputted with a head for recording for a long time having a narrower width than a head for three times mode and recorded in the magnetic recording medium. In requesting the recording of 24hours such as a CCTV for monitoring, an omission of the important image signal by loosing a shifting time of tape is prevented. The economic efficiency is improved by increasing a density of the image signal recorded in the tape.
Patent KR-19990063430-A (KR)
Title: 고순도 스쿠알란, 그를 이용한 의약화장품원료 및 그의 제조방법
IPC: C07C9/22
Filed: 1998-12-24
Abstract: 동물성 유지 유래의 스쿠알란을 박막증류에 의해 정제하므로써 프리스탄의 양을 10중량ppm 이하로 저감시킨 고순도 스쿠알란이 얻어진다. 상기 고순도 스쿠알란은 화장품 및 의약품의 원료로서 유용하고, 특히 콘돔용 윤활성 약제 및 보조제 조성물의 성분으로서 매우 유효하다.
Patent KR-20000042664-A (KR)
Title: Multi chip package
Inventor: KIM JAE MYEON
IPC: H01L21/98
Filed: 1998-12-26
Abstract: PURPOSE: A multi chip package is provided to reduce a size of the package to that of a chip and to improve electrical characteristics and structural reliability. CONSTITUTION: A multi chip package includes a first chip(20) and a second chip(10). The first chip(20) is coated with an insulating layer(21) but pads(22) formed on the chip(20). The pads(20) are respectively connected to solder balls(30) through metal patterns(23) selectively formed on the insulating layer(21). The second chip(10) is also coated with an insulating layer(11), and pads(12) thereon are exposed through the insulating layer(11). In addition, respective metal bumps(13) are formed on the pads(12). The second chip(10) is turned over so that the metal bumps(13) are faced toward and then electrically connected to the metal patterns(23) of the first chip(20). The solder balls(30) of the first chip(20) are located outside of the mounted second chip(10) and higher than the second chip(10). The first chip(20) may further have an outermost insulating layer(24) which mostly covers the metal patterns(23) but partly expose the metal patterns(23) for connections with the metal bumps(13) and the solder balls(30).
Patent KR-20000044560-A (KR)
Title: Method for forming trench isolation film of semiconductor device
Inventor: WON DAE HEE
IPC: H01L21/76
Filed: 1998-12-30
Abstract: PURPOSE: A method for forming a trench isolation film of a semiconductor device is provided which can suppress stress induced on a substrate during a post thermal oxidation process after a shallow trench isolation process. CONSTITUTION: A method for forming a trench isolation film suppresses stress induced on a silicon substrate(101) during a thermal oxidation process. The method suppresses an oxidation gas to penetrate into the semiconductor substrate during the post thermal oxidation process, by forming a nitride layer(200) at an interface between a trench side wall oxide and the semiconductor substrate by performing a nitrogen ion implantation, after forming a trench(104) and the trench side wall oxide. Therefore, the method can prevent the defect of semiconductor lattice.
Patent KR-20000045114-A (KR)
Title: Circuit for restraining carriers when i baseband signal and q baseband signal are modulated in wireless local loop system
Inventor: LEE KYEONG HAN
IPC: H04B7/24
Filed: 1998-12-30
Abstract: PURPOSE: A circuit for restraining carriers is provided to prevent output loss of transmission power through carrier restraints, by using current feedback amplifiers capable of compensating direct current(DC) offsets to remove the DC carriers from an I baseband signal and a Q baseband signal, to modulate the two signals as intermediate frequency(IF) signals, in a transmitting terminal of a base station in a wireless local loop(WLL) system. CONSTITUTION: A circuit for restraining carriers in a wireless local loop(WLL) system comprises current feedback amplifiers(A10,A20), low pass filters(LPFs)(11,21), and an I&Q modulator(30). Variable resistances(VR1,VR2) are connected to null terminals of the current feedback amplifiers. Ground resistances(R1,R2) are connected to common terminals of the current feedback amplifiers. The current feedback amplifiers compensate direct current(DC) offset values for inputted I/Q baseband signals. The current feedback amplifiers restrain carriers loaded in the I/the Q baseband signals. The LPFs remove high frequency noises for the I/the Q baseband signals in which the carriers are perfectly removed. The I&Q modulator mixes local frequencies inputted from outside with each of the I/the Q baseband signals passing through the LPFs. The I&Q modulator modulates the I/the Q baseband signals to output the two signals as intermediate frequency(IF) signals.