baber/WOPTO huggingface dataset:
Patent KR-870000533-B1 (KR)
Title: Carbon fiber's making method
Inventor: IZUMI CHINKO
IPC: D01F9/32
Filed: 1985-04-24
Granted: 1987-03-14
Abstract: This invention relates to carbon fiber which has modified strength and modulus of elasticity. Polyacrylonitrile fiber is heated at 200- 400≰C in multistep. This heating process is performed in oxidative condition. After the heating process, the fiber is carbonated. The density of heated fiber is 1.26-1.38g/cm3. The polyacrylonitrile fiber is prepd. by coating acrylonitrile copolymer with amino silicone.
Patent KR-870002046-B1 (KR)
Title: Imaging apparatus using ultrasonic waves
Inventor: PARK SONG-BAE
IPC: A61B8/00
Filed: 1985-05-31
Granted: 1987-12-03
Abstract: The invention relates to a video signal processor that may be used for a ultrasonic diagnostic tester, non-destructive detector or underwater sonar of the sector-type employing steering and dynamic focusing.  In the unit, an array transducer is connected to a steering delay circuit and then to the focusing circuit of the steering delay circuit to first perform steering to make delay for focusing.  Thus, although steering circuits increase in number, focusing circuits are greatly reduced to result in a less total number of circuits for dynamic focusing, thus allowing more focusing points for better resolution.
Patent KR-920007289-B1 (KR)
Inventor: DREXLER JEROME
IPC: G11B7/24094
Filed: 1985-06-29
Granted: 1992-08-29
Abstract: 내용 없음.
Patent KR-900006198-B1 (KR)
Title: Braun tube
Inventor: YAMAJAKI EICHI
IPC: H01J29/60
Filed: 1986-07-25
Granted: 1990-08-25
Abstract: A cathode-ray tube comprising a bulb (1), an anode target (2) region formed on the inner surface of said bulb (1), an electron gun (5) for emitting an electron beam (6) and a reflecting electrode (8) for generating a reflecting equipotential surface (8) for reflecting the beam towards the anode target region, means being provided for varying the reflecting action of the equipotential surface so as to cause said electron beam to be scanned from said surface over said anode target region.
Patent KR-890002449-B1 (KR)
Title: Method of inoculation of mushroom
Inventor: HO CHUN-MAN
IPC: A01G1/04
Filed: 1986-09-12
Granted: 1989-07-10
Abstract: A method for cultivating Bacidiomycetes is presented.  Thus, a small pole contg. seed culture of Bacidiomycetes (3) was grafted to a main log (1) and both ends of the inoculation holes (2) were sealed with paraffin (4) to reduce rooting time.
Patent KR-900002720-B1 (KR)
Title: Ring signal dispersion control method
Inventor: KANG SUNG-BONG
IPC: H04M3/02
Filed: 1986-10-31
Granted: 1990-04-23
Abstract: The method comprises a first step for converting dial signal to port number to which dial signal is transmitted, a second step for searching the record of port number from the lowest start address, a third step for recording the port number on the start address, a fourth step for selecting the start address for driving off the relay connected to the subscriber, and for driving on the relay connected to the port number recorded on the address, and a fifth step for increasing the start address at every second which acts as a start address for iteration of the third step.
Patent KR-900007360-B1 (KR)
Title: Band type strapping machine
Inventor: MORI MOTOAKI
IPC: B65B13/32
Filed: 1986-11-29
Granted: 1990-10-08
Abstract: The band type strapping machine comprises a band feeding roller and a band returning roller. A first driving roller is placed above the band feeding roller so as to be able to come in contact with the feeding roller. A second driving roller is placed below the band returning roller so as to be able to come in contact with the returning roller. A belt is engaged with the band feeding roller and the band returning roller so that the both rollers are driven in the same direction. A motor is provided for driving the belt.
Patent KR-900004613-B1 (KR)
Title: Whisbone suspensione for automotive vehicle
Inventor: SHIBAHATA YASUJI
IPC: B60G3/26
Filed: 1986-12-24
Granted: 1990-06-30
Abstract: The suspension comprises an axle bearing housing (22, 18), a first arm (10) resiliently pivoted (10a,13) to the chassis (1) while its outer end is ball-jointed to that housing at a point inward of the normal median plane through the wheel centre, and second (23) and third (24) arms resiliently pivoted (23a,24a) to the chassis and with their outer ends ball-jointed (23b,24b) to the the housing. The axes of the arms (23,24) intersect at a point outward of the median plane while a line connecting this intersection to the ball-joint (106) centre intersects the plane at or near the wheel centre. A lateral link arm (19) resiliently pivoted (19a) to the chassis has its outer end ball-jointed (19b) to the axle housing.
Patent KR-910001458-B1 (KR)
Inventor: YOSHIDA YUJIO
IPC: E05F15/14
Filed: 1986-12-27
Granted: 1991-03-07
Abstract: 내용 없음.
Patent KR-940010214-B1 (KR)
Inventor: KONO YOSHIMI
IPC: C08F218/18
Filed: 1987-06-24
Granted: 1994-10-22
Abstract: 내용 없음.
Patent KR-900003849-B1 (KR)
Title: Circuit substrate and thermal printing head using the same caller identifying method
Inventor: NARIZUGA YASUNORY
IPC: B41J2/335
Filed: 1987-07-08
Granted: 1990-06-02
Abstract: Circuit substrate includes at least part of an electrode to be soldered formed of an alloy of (in mol%) Cu-35-25 and Ni 65-75, so that diffusion of solder into the electrode can be avoided while a protective inorganic layer, pref. SiO2, and the solder have good adhesion to the electrode.
Patent KR-910009210-B1 (KR)
Inventor: MATSUI YASUSHI
IPC: C01G49/02
Filed: 1987-07-13
Granted: 1991-11-05
Abstract: 내용 없음.
Patent KR-900000115-B1 (KR)
Title: Interfacing method using fifo system
Inventor: PARK KI-HO
IPC: G06F13/00
Filed: 1987-07-29
Granted: 1990-01-20
Abstract: The circuit includes an external equipment (20) for inputting data to CPU and for transmitting the CPU data, a parallel I/O unit (30) for writing the data of CPU and the data of the external exquipment (20) to PIPO and for transmitting the PIPO data, a data transmission controller (50) for holding the I/O unit signal at certain time and for transmitting the hold data to ACK port, and an interrupt signal generator (60) for transmitting interrupt signal to the CPU (10) by the PIPO EMPTY signal.
Patent KR-900004522-B1 (KR)
Title: High macropore catalyst for the selective hydro-genation of diolefinic hydrocarbons
Inventor: GATUSO MARK J
IPC: C10G45/04
Filed: 1987-09-21
Granted: 1990-06-29
Abstract: A catalyst for selective hydrogenation of di-olefinic, pref. C8-20, hydrocarbons to monoolefinic hydrocarbons consists essentially of an Al2O3 support material, 0.05-1.5 wt.% S and 1.0-25.0 wt.% Ni. The Al2O3 support material is characterized by a pore vol. of 1.4-3 cc/g, a surface area of at least 150 cm2/g and a pore dia. of 600 angstroms ( over 60% of its pore vol.). The catalyst is useful for treating the butene feed streams to motor fuel alkylation units.
Patent KR-900007210-B1 (KR)
Title: Training ammunition disintegrating upon impact
Inventor: LEE JIN-BOM
IPC: F42B8/14
Filed: 1987-10-15
Granted: 1990-10-05
Abstract: The target practice frangible projectile (10) includes bullet body (11) with thin layer of the wall, hollow bullethead (12) connected with the front part of the bullet body, bullet charge (14) for controlling weight of target practice frangible projectile easily breaking and scattering broken pieces, supporting tube (15) holding the charge of bullet body.
Patent KR-910003715-B1 (KR)
Title: Polyurethane film with permeability and process for preparation thereof
Inventor: LEE HO-KYUNG
IPC: C08J5/18
Filed: 1987-12-19
Granted: 1991-06-08
Abstract: Pores of grey plain fabric, whose density is 190T or 210T and woven from polyamide  or  polyester  filaments,  are  filled  with polymer fillers 1-109/yd amount. The filler is mainly polyurethane or acrylic resin which is  compatible  with  polyurethane  organic solvent. The filled grey fabric is  water-repellent  treated  with repellent agent of which the concentration is below 3%.  Then  the polyurethane organic solvent which  is  composed  of  polyurethane solids, polar organic solvent,  anionic  or  nonionic  surfactant, silica gel and polyisocyanate are coated above the fabric.  It  is wet-solidified in 1-20% DMF solution, thus forming micropores onto the fabric. Polyurethane film is stripped from the fabric.
Patent KR-910001446-B1 (KR)
Title: Checking machine of bibration
Inventor: BYUN DONG-YONG
IPC: G01H11/00
Filed: 1988-01-04
Granted: 1991-03-07
Abstract: A portable vibration measuring device is used for classifying vibration occurring from rotating  mechanical  system,  especially rotational body's  actuators,  gears  and  rolling  bearings  into various  frequency  bands  and   quantatatively   measuring   each vibration   level.   The   vibration   measurer    comprises     a piezo-electricity type  accelleration  pick-up  (1),  an  analogue section (3) where an amplifier (5),  an  integrator  (6),  lowpass filter, high-pass filter (29)  a  demodulation  circuit  (8),  and calculation circuits (9,10) are assembled, and a  digital  section (4) where a control circuit (12), a  memory  IC  (11),  AC  output circuit (14), DC  output  circuit  (15)  and  a  voltage-frequency transducer (16) are assembled.
Patent KR-910010179-B1 (KR)
Inventor: WINCKLER PETER S
IPC: F16J15/32
Filed: 1988-04-06
Granted: 1991-12-20
Abstract: 내용 없음.
Patent KR-960006006-B1 (KR)
Inventor: NAGASAWA TAKAO
IPC: C10L1/06
Filed: 1988-05-19
Granted: 1996-05-06
Abstract: 내용 없음.
Patent KR-940004228-B1 (KR)
Inventor: MORIYAMA MASAO
IPC: B29B7/16
Filed: 1988-05-26
Granted: 1994-05-19
Abstract: 내용 없음.
Patent KR-960013696-B1 (KR)
Inventor: TAKEUCHI KENICHI
IPC: H04N7/14
Filed: 1988-06-18
Granted: 1996-10-10
Abstract: 내용 없음.
Patent KR-910006171-B1 (KR)
Inventor: NOKUZI SYOOIZI
IPC: H02M3/335
Filed: 1988-10-18
Granted: 1991-08-16
Abstract: 내용 없음.
Patent KR-960007844-B1 (KR)
Title: Manufacturing process of the thick film chip condensor
Inventor: JUNG HYUN-DOO
IPC: H01G4/33
Filed: 1988-11-29
Granted: 1996-06-12
Abstract: composing an internal electrode (13) by screen printing metallic liquid paste on the aluminum substrate (1) and curing it at the high temperature (850 =F 20 deg.C); forming a dielectric thin film (14) by screen printing and drying the crystallizable glass dielectric compositions paste which has a constant dielectric constant and low dissipation factor and stabilizing it at the high temperature (850 =F 20 deg.C); forming and trimming the internal electrode (15) by screen printing and curing metallic liquid pastes around the first substrate separating hole (11); forming a protection layer (16) by marking a number for reading the capacitance and curing it at the high temperature (600=F 15 deg.C) after screen printing and drying a liquid protection layer paste; plating the top of the electrode (18) with Ni (19), Pb and Sn (20) after printing and curing the electrode (18).
Patent KR-950013163-B1 (KR)
Title: Remote controller
Inventor: YANG BYONG-HWAN
IPC: H04Q9/00
Filed: 1988-12-22
Granted: 1995-10-25
Abstract: if a remote controller received data input is generated, determining whether the input is reservation data or general control data; if the input is the reservation data, decoding the reservation data and determining whether an input of parity word is completed; comparing the parity word by the decoding of the reservation data with previously inputted parity word, and if same, outputting a normal data input indication voice control signal; and if different, outputting an abnormal data input indication voice control signal.
Patent KR-930001492-B1 (KR)
Inventor: SHIMADA HIROMICHI
IPC: G11B27/032
Filed: 1989-02-10
Granted: 1993-03-02
Abstract: 내용 없음.
Patent KR-960014354-B1 (KR)
Inventor: EVANS DAVID ALBERT
IPC: C07D405/00
Filed: 1989-03-23
Granted: 1996-10-15
Abstract: 내용 없음.
Patent KR-920002942-B1 (KR)
Inventor: OOHASHI KUNIO
IPC: G11B21/08
Filed: 1989-06-24
Granted: 1992-04-10
Abstract: 내용 없음.
Patent KR-920004537-B1 (KR)
Title: Automatic high speed paper apparatus and method/supply
Inventor: LEE SUNG-BOK
IPC: G03G15/00
Filed: 1989-06-28
Granted: 1992-06-08
Abstract: The apparatus includes  a  paper  supplying  roller  (7)  for receiving a driving  power  from  a  driving  motor  (9)  and  for maintaining papers on a paper path  (14).  A  plurality  of  error preventing rollers (2) are installed above  and  below  the  paper path (14) to keep the papers from departing from the correct path. A plurality of paper carrying rollers  (3,3")  receive  a  driving power from the driving motor to make  the  moving  papers  further advance. A paper distributing plate (5) guides the moving  papers, and a paper distribution driving  shaft  (10')  drives  the  paper distributing components, while first and second power transmitting shafts (19,19') supply  a  driving  power  to  the  paper  driving components. The apparatus can be conveniently applied to miniature copy machines to save time and manhour.
Patent KR-920010000-B1 (KR)
Inventor: KENJI ODA
IPC: G11B7/0045
Filed: 1989-08-22
Granted: 2020-03-23
Abstract: 내용 없음.
Patent KR-940004342-B1 (KR)
Inventor: HORI TOSHIO
IPC: F02D41/14
Filed: 1989-09-01
Granted: 1994-05-23
Abstract: 내용 없음.
Patent KR-920005443-B1 (KR)
Inventor: MATSUNAMI TAGAO
IPC: G01J1/04
Filed: 1989-10-20
Granted: 1992-07-04
Abstract: 내용 없음.
Patent KR-920007715-B1 (KR)
Title: Paper sheet transfer guide apparatus with byside copying function for copying machine
Inventor: KIM DONG-KWUI
IPC: G03G15/00
Filed: 1989-10-20
Granted: 1992-09-15
Abstract: The device has a page shifting means to copy the  content  of paper printed on both pages in a copy paper with both  pages.  The device comprises  fixing  means  with  fixing  roller  (35)   and compressing roller (34) to fix toner image  on  copy  paper  (31); paper discharging roller (36)  for  discharging  the  paper  (31); solenoid (1) operated by signals from jam sensor (4)  and  mounted on a turning point  between  paper  disc  harging  path  (38)  and returning path (26); guide plate (2) pivoted on a  hinge  (3)  for turning guide  direction  of  the  paper  (31)  by  the  solenoid; solenoid (11) for refeeding the paper  (31)  page-shifted  by  the plate (2); refeed roller (15) for feeding the paper (31)  along  a path (16).
Patent KR-920004248-B1 (KR)
Title: Magnetic media
Inventor: CHUN SEUNG-HO
IPC: G11B5/84
Filed: 1989-11-10
Granted: 1992-05-30
Abstract: The magnetic recording medium is mfd. by forming the magnetic layer by coating the  magnetic  coating  solution  comprising  the strong magnetic fine powder and the binder onto  the  non-magnetic base substrate. The magnetic coating solution comprises the binder contg. the  functional  gp.  of  carboxylic  acid  or  its  salts, sulfonic acid or its salts, phosphoric acid or its salts type; and 2 or more wt. pts. of a volatile component; and 0.5-20 wt. pts. of carbonblack having 10 mμ- 10μ of diameter  w.r.t.  the  magnetic powder. The obtd. magnetic recording  medium  has  a  lower  light transparent ratio, good antistatic property, and higher SN ratio.
Patent KR-910010053-B1 (KR)
Title: Method for cooling the double chamber tuyer
Inventor: KIM BOK-KON
IPC: C21B7/10
Filed: 1989-11-14
Granted: 1991-12-12
Abstract: The double chamber tuyer comprises a body and a tip  tube,  a water pipe and a drain pipe of body and tip, a water  pipe  and  a drain pipe valve of body and tip, the flexible pipes  between  the tube and the pipes, a connecting valve and a  connecting  flexible pipe between the water pipe of the body and the drain pipe of  the tip. The water flows from the water pipe and tube and to the drain pipe of the tip with 9-10 kg/cm2 and the water pressure is lowered into 4.5- 7.0 kg/cm2 and flows though the connecting part and  from the water pipe and the tube and to the drain pipe  of  body.  This cooling system protects the tuyer of furnace from a heavy damage.
Patent KR-960003250-B1 (KR)
Inventor: HARADA MASAKI
IPC: F02M35/12
Filed: 1989-12-27
Granted: 1996-03-07
Abstract: 내용 없음.
Patent KR-930000729-B1 (KR)
Title: Digital data frame synchronizing circuit
Inventor: KIM JONG-HO
IPC: H04L7/00
Filed: 1989-12-30
Granted: 1993-01-30
Abstract: The frame synchronizing circuit adopting a parallel detecting method for improving the performance comprises; a first buffer (1) for storing the 4 bit data; a second buffer (2) and  a  means  (3) outputting signal for data pattern comparison  after  passing  the contents of second buffer to the first buffer, if the  4-bit  data stored at the first buffer is different to the third digital stage sub-frame pattern; a means (7) outputting the control  signal  for transfering the sub-frame pattern to the asynchronous state or the synchronizing  state;  a  means  (5)  for  generating   a   signal appointing the over head  bit  location  of  third  digital  stage frame.
Patent KR-950013500-B1 (KR)
Title: A tool ring a method of making it and a holding tool for use in the performance of the method
Inventor: NIELSEN OVE
IPC: B21K1/46
Filed: 1989-06-23
Granted: 1995-11-08
Abstract: PCT No. PCT/DK87/00134 Sec. 371 Date Jun. 22, 1990 Sec. 102(e) Date Jun. 22, 1990 PCT Filed Oct. 23, 1987 PCT Pub. No. WO89/03734 PCT Pub. Date May 5, 1989.A tool ring (1) for securing blanks in a machine of the type comprising a pair of rotating rings whose opposite, plane side faces are formed with a plurality of holding tools (8, 11) so adapted that an oblong blank (16) can be secured substantially radially between a pair of holding tools in respective ones of said rings. At least one ring has a groove (4) which is adapted to receive holding tools and spacer tools (9, 10, 10', 12) of which at least the holding tools have a convex face (23, 33) to engage the engagement face (19) of said groove. The holding tools (8, 9, 11) are mutually spaced by the spacer tools, and some of the spacer tools (10, 12) are positioned in the groove, while the position of the spacer tools is defined by the cooperation between edge faces (24, 25, 30, 31) on the tools.
Patent KR-930003001-B1 (KR)
Title: Low-noise cmos driver
Inventor: KIM BYONG-YUN
IPC: G11C7/10
Filed: 1990-07-19
Granted: 1993-04-16
Abstract: The CMOS driver circuit for data output  buffer  comprises  a pull-up PMOS transistor (PM)  having  a  first  current  electrode connected to a power voltage (Vcc),  a  second  current  electrode connected to an output node and a control electrode receiving  the input signals, a pull-down NMOS transistor  (NM)  having  a  first current electrode connected to a ground voltage, a second  current electrode connected to the output node  and  a  control  electrode receiving inverted input  signals,  nd  a  limiter  (D)  connected between the supply voltage (Vcc) and the first  current  electrode of the pull-up PMOS transistor (PM) to reduce the PMOS  transistor engaging level to a value determining the  output  node  (N3)  and reduce its peak current to a preset  level  if  the  output  state change is rising, thereby reducing the output interference.
Patent KR-920008851-B1 (KR)
Title: Process for making soybean powder
Inventor: PARK DU-YONG
IPC: A23L11/00
Filed: 1990-08-06
Granted: 1992-10-10
Abstract: A soybean powder is prepd. by (a) selecting soybean carefully in a magnetic selector,  (b)  peeling  the  selected  soybean  and crude- pulverizing to obtain the 60-80 mesh powder, (c) drying  the obtd. powder at 50-85 deg.C and (d) pulverizing the  dryed  powder again to obtain the 280-340 mesh soybean powder. The obtd. soybean powder is useful for the prodn. of food, cosmetic, drug etc..
Patent KR-0156567-B1 (KR)
Inventor: MORIOKA HIROSHI
IPC: E04H6/28
Filed: 1990-08-14
Granted: 1998-11-16
Abstract: 내용 없음.
Patent KR-930000049-B1 (KR)
Title: Method of treating chemical dependencies using sertraline for animal
Inventor: BICK PETER A
IPC: A61P25/30
Filed: 1990-08-29
Granted: 1993-01-06
Abstract: A method of treating a chemical dependency in a mammal, comprising administering to a mammal in need of such treatment an amount of the compound (1S-cis)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-1-naphthal enamine, also known by the generic name sertraline, or a pharmaceutically acceptable salt thereof, effective in reducing or alleviating such dependency.
Patent KR-960014010-B1 (KR)
Inventor: SADAO FUJIMORI
IPC: G01M17/007
Filed: 1990-08-30
Granted: 1996-10-11
Abstract: 내용 없음.
Patent KR-930007101-B1 (KR)
Inventor: RA SA-KYUN
IPC: H01L29/78
Filed: 1990-09-13
Granted: 1993-07-29
Abstract: 내용 없음.
Patent KR-930000496-B1 (KR)
Title: Auto transmission
Inventor: PARK DONG-HUN
IPC: F16H3/58
Filed: 1990-09-14
Granted: 1993-01-21
Abstract: The gear  changer  having  three  additional  speed  changing ratios on 2-shafts/3-speeds transmission, improves fuel efficiency and accelerating ability, and reduces impact  in  speed  changing. The gear changer  having  a  planetary  gear  system  including  a forward sun gear, a one-way clutch, a  long  pinion  and  a  short pinion at  the  carrier,  an  annulus  gear,  a  small  sun  gear, comprises subsidiary carrier (34)  formed  on  hollow  shaft  (30) elongated from annulus gear (20); a plurality of pinions  (36)  on the carrier engaged  with  inner  subsidiary  annulus  gear  (38); wet-type  multi-disc  clutch  (C4)  for  intermitting  between   a plurality of pinions (36) and sun gear (40);  wet-type  multi-disc brake (B3) provided with the gear (40) in transmission  case  (6), for restricting subsidiary planetary gear system (32).
Patent KR-940005386-B1 (KR)
Inventor: CHAO TZY-HONG
IPC: H04N5/21
Filed: 1990-11-28
Granted: 1994-06-17
Abstract: 내용 없음.
Patent KR-930007724-B1 (KR)
Title: Device for preventing theft of vehicles
Inventor: OH YONG-SHIK
IPC: B60R25/0215
Filed: 1991-01-25
Granted: 1993-08-18
Abstract: A burglar-proof device hinders a burglar's view  by  erecting the hood if a burglar enters and starts a car.  The  burglar-proof device includes a  first  solenoid  (18),  which  is  electrically connected with an auxiliary switch (27) concealed in the car,  for cancelling an auxiliary lock (8) by the auxiliary  switch,  and  a second solenoid (19), which is connected with  a  lock  cable  (2) through an auxiliary cable (22) and is electrically connected with a ignition coil in a starting key box, for cancelling a main  lock (7) by the starting key operation. A hood opening system  includes a rack rotatably connected with an end of the hood (1),  a  pinion connected with a motor, and an elastic  body  to  stick  fast  the pinion to the rack.
Patent KR-0175144-B1 (KR)
Inventor: MITSUO KMURO
IPC: A61N2/08
Filed: 1991-03-12
Granted: 1999-03-20
Abstract: 자기효과 및 지압효과를 가지며 또한 양호한 통기성을 가진 건강베개(P)가 발포성 합성수지로 만들어진 중공의 베개몸체(1), 베개몸체(1)의 상면에 산점적으로 분포된 다수의 영구자석(9), 베개몸체(1)와 영구자석(9)을 덮는 커버(10)로 구성되어있으며, 상기 중공의 베개몸체(1)는 발포성 합성수지 그 자체로 만들어지고 각각의 영구자석(9)이 돌기(4)들 사이에 배치되는 태양으로 구 상면에 산점적으로 분포된 다수의 돌기(4) 및 발포성 합성수지 그 자체로 만들어지고 그 저면에 산점적으로 분포된 다수이 돌기(4)를 가지고 있고, 또한 상기 중공의 베개몸체(1)는 그 외측과 그 내부에 형성된 중공부(6)가 통하도록 산점적으로 형성된 통기공(7,8)을 구비하고 있다.
Patent KR-940001794-B1 (KR)
Title: Attenuation control circuit of wireless telephone
Inventor: LEE BO-MAN
IPC: H04B1/04
Filed: 1991-03-21
Granted: 1994-03-05
Abstract: The radio frequency of a wireless amplifier is controlled linearly to stabilize operation of a wireless amplifier. The circuit includes a coupler (6) for coupling a RF signal, an A/D converter (10) for converting the coupled RF signal into a digital signal, a microcomputer (12) for generating a digital control signal according to an output signal of the A/D converter (10), a D/A converter (14) for converting the digital control signal into an analog signal, an approximater (16) for approximating the analog control signal, a current controller (18) for generating a current control signal according to the output signal of the approximator (16), and a first and a second variable attenuators (19,20) for attenuating the RF signal linearly according to the current control signal generated by the current controller (18).