Abstract:
PURPOSE: A method for producing a communication frame of a body area network, and a communication method of a body area network using the same are provided to enable plural body area terminals to coexist in a narrow space without communication interference. CONSTITUTION: A method for producing a communication frame of a body area network comprises the steps of: detecting the number of terminals which exist in a predetermined area(310); allocating individual frames to use each terminal existing in the predetermined region according to the number of the detected terminals(320); and allocating a transmission co-existence frame to all terminals existing the predetermined region according to the number of the detected terminals(330), wherein the co-existence frame includes the allocation information on the individual frame used by each terminal.
Abstract:
PURPOSE: A communication apparatus using a near field is provided to enable a communication apparatus to efficiently perform power supply and to increase data transmission ratio by sharing an interface. CONSTITUTION: A near field signal providing unit(110) supplies one of signals, which applies digital modulation to a base band signal, to a near filed signal. An interface unit(120) transmits and receives the near field signal. A control unit(130) controls the interface unit and the near field signal providing unit.
Abstract:
PURPOSE: A communication system using a portion of a human body is provided to create a stable radio channel using a low frequency band. CONSTITUTION: Transmitting party and receiving party communication devices(10,20) transmits and receives data signals through a wireless transmitting mode. The transmitting party and receiving party couplers transfer data signals between the transmitting party and receiving party communication devices and a human body(30). Transmitting party and receiving party impedance matching devices enables impedance matching between the transmitting party and receiving party communication devices and the transmitting party and receiving party couplers. The transmitting party communication device applies the transmitting data signal of an electrical signal form through the transmitting party coupler to the human body.
Abstract:
The low dissipation mixed mode power amplifier is provided to extend the life time of battery by maximizing the efficiency of the maximum usage frequency region. The mixed mode power amplifier(1000) comprises the low output amplifier circuit(1100), the high power amplification circuit(1200), and the amplifier control part(950) and bias circuit(900). The low output amplifier circuit comprises the input impedance conformable part(100), the primary amplification section(200), and the first mid-stage impendence matching line(300) and low output amplifier(700). The high power amplification circuit(1200) comprises the second amplifier(400), and the second mid-stage impendence matching line(500) and high power amplifier(600).
Abstract:
본 발명은 RFID와 같은 무선통신 시스템에서 태그(Tag) 또는 트랜스폰더(Transponder)가 매우 적은 전력으로 효율적으로 입력진폭신호의 정보를 복원하도록 하는 복조회로에 관한 것이다. 본 발명의 복조회로는 전압체배기의 출력을 커패시티브 커플링을 통해 저 전류패스에 연결하여 정보를 복원한다. 본 발명에 의하면, 변조 깊이가 낮은 입력진폭신호에서 정보를 저전력으로 복원하여 통신거리를 증가시킬 수 있다. RFID, 태그(Tag), 트랜스폰더(Transponder), 해독기(Reader), AM, 복조회로, 전압체배기,
Abstract:
A low-power RFID(Radio Frequency Identification) demodulation circuit for information recovery is provided to increase the communication distance from a reader by connecting the output of a voltage multiplier to a low-current path through capacitive coupling so that a tag in an RFID system can execute information recovery from a signal having a low modulation depth. An RFID demodulation circuit consists of 7 transistors(M1-M7), a capacitor(C), and two current sources(I1,I2). The first electrode of the capacitor(C) is connected to an input port of the demodulation circuit, and the second electrode is connected to the gate of the seventh transistor(M7). The first current source(I1) is connected between the first electrode of the capacitor(C) and the ground. The drain and source of the first transistor(M1) respectively are connected to a source voltage port(Vdd) and one end of the second current source(I2), and the gate is connected with the source through a diode. The second current source(I2) is connected between the source of the first transistor(M1) and the ground. The drain and source of the second transistor(M2) respectively are connected to the source voltage port(Vdd) and the drain of the third transistor(M3). The gate of the second transistor(M2) is connected to gates of the first, fourth, and sixth transistors(M1,M4,M6) in common. The source of the third transistor(M3) are connected to the ground, and the gate is connected to the drain through a diode. The drain of the fourth transistor(M4) is connected to the source voltage port(Vdd), and the source is connected to gates of the fifth and seventh transistors(M5,M7) and the second electrode of the capacitor(C). The source and gate of the fifth transistor(M5) are connected to the ground and gate of the third transistor(M3) respectively. The drain and source of the sixth transistor(M6) are connected to the source voltage port(Vdd) and the drain of the seventh transistor(M7) respectively. The source of the seventh transistor(M7) is connected to the ground.
Abstract:
본 발명은 PLL(Phase locked-loop)이나 DLL(Delay locked-loop)에 사용되는 위상 주파수 검출기에 관한 것으로, 소정 시간 지연된 기준클럭과 리셋신호에 따라 동작되는 제 1 스테이지, 상기 기준클럭과 상기 제 1 스테이지의 출력에 따라 동작되는 제 2 스테이지 및 상기 제 2 스테이지의 출력을 반전시켜 출력하는 인버터로 구성된 업 신호 출력부, 소정 시간 지연된 외부클럭과 상기 리셋신호에 따라 동작되는 제 1 스테이지, 상기 외부클럭과 상기 제 1 스테이지의 출력에 따라 동작되는 제 2 스테이지 및 상기 제 2 스테이지의 출력을 반전시켜 출력하는 인버터로 구성된 다운 신호 출력부, 상기 업 신호 출력부의 제 2 스테이지 출력과 상기 다운 신호 출력부의 제 2 스테이지 출력을 논리 조합하여 상기 리셋신호를 생성하는 논리 게이트를 포함한다. 유효한 제어신호를 얻을 수 있는 입력신호의 위상 범위가 넓으므로 위상고정이 빨라지고, 다이나믹 로직의 적은 전력소모와 빠른 신호전달 특성으로 인해 저전력 및 저잡음 특성을 가진다. 위상 주파수 검출기, 위상고정, 동작 주파수, 지연수단