• Title/Summary/Keyword: 디지털-아날로그 변환기

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The Design and Implementation of TV Tuner for the Digital Terrestrial Broadcasting (지상파 디지털 방송용 TV 튜너 설계 및 구현)

  • 정영준;김재영;최재익;박재홍
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.2
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    • pp.302-312
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    • 2000
  • Digital TV tuner for 8-VSB modulation was developed with satisfying the requirements of ATSC. Double frequency conversion and active tracking filter was used in order to suppress IF beat and image band, which results in reducing the interference between adjacent channels and multi-channels. The implemented digital TV tuner has excellent performance such as the wide dynamic range, good flatness in passing band, and low phase noise. The developed tuner is available to handle the digital and analogue television signal at the same time.

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Modeling of Pipeline A/D converter with Verilog-A (Verilog-A를 이용한 파이프라인 A/D변환기의 모델링)

  • Park, Sang-Wook;Lee, Jae-Yong;Yoon, Kwang-Sub
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.10C
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    • pp.1019-1024
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    • 2007
  • In this paper, the 10bit 20MHz pipelined analog-to-digital converter that is able to apply to WLAN system was modeled for ADC design. Each blocks in converter such as sample and hold amplifier(SHA), comparator, multiplyng DAC(MDAC), and digital correction logic(DCL) was modeled. The pipelined ADC with these modeled blocks takes 1/50 less time than the one of simulation using HSPICE.

Incremental Delta-Sigma Analog to Digital Converter for Sensor (센서용 Incremental 델타-시그마 아날로그 디지털 변환기 설계)

  • Jeong, Jinyoung;Choi, Danbi;Roh, Jeongjin
    • Journal of the Institute of Electronics and Information Engineers
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    • v.49 no.10
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    • pp.148-158
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    • 2012
  • This paper presents the design of the incremental delta-sigma ADC. The proposed circuit consists of pre-amplifier, S & H circuit, MUX, delta-sigma modulator, and decimation filter. Third-order discrete-time delta-sigma modulator with 1-bit quantization were fabricated by a $0.18{\mu}m$ CMOS technology. The designed circuit show that the modulator achieves 87.8 dB signal-to-noise and distortion ratio (SNDR) over a 5 kHz signal bandwidth and differential nonlinearity (DNL) of ${\pm}0.25$ LSB, integral nonlinearity (INL) of ${\pm}0.2$ LSB. Power consumption of delta-sigma modulator is $941.6{\mu}W$. It was decided that N cycles are 200 clock for 16-bits output.

Fuzzy Pulse-Width-Modulated Feedback Control: Global Intelligent Digital Redesign Approach (퍼지 펄스폭 변조 궤환 제어: 전역적 지능형 디지털 재설계 접근법)

  • Lee Ho Jae;Joo Young Hoon;Park Jin Bae
    • Journal of the Korean Institute of Intelligent Systems
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    • v.15 no.1
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    • pp.92-97
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    • 2005
  • This paper discusses an intelligent digital redesign technique for designing a fuzzy pulse-width-modulated (PWM) control. First when we are given a well-designed fuzzy analog control, the equivalent digital control is intelligently redesigned. Using the similar technique we intelligently redesign the fuzzy PWM control from the intelligently redesigned fuzzy digital control. A stabilizability of the intelligently redesigned PWM control is rigorously analyzed.

A Design of Digital Instrumentation Amplifier converting standard sensor output signals into 5V voltage-output (표준 센서 출력신호를 5V 전압-출력을 변환하는 디지털 계측 증폭기 설계)

  • Cha, Hyeong-Woo
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.48 no.11
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    • pp.41-47
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    • 2011
  • A novel digital instrumentation amplifier(DIA) converting universal signal inputs into 5V voltage-output for industry standard sensor signal processing was designed. The circuit consists of a commercial instrumentation amplifier, seven analog switches, two voltage references of 1.0V and -10.0V, and four resistors. The converting principle is the circuit reconstruction by switches for resistor values and reference voltages according to input signals. The simulation result shows that the DIA has a good output voltage characteristics of 0~5V for the input voltage of 0V~5V, 1V~5V, -10V~+10V, and 4mA~20mA. The nonlinearity error was less than 0.1% for the four type signal inputs.

Temperature Stable Time-to-Digital Converter (온도변화에 안정한 시간-디지털 변환 회로)

  • Choi, Jin-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.4
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    • pp.799-804
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    • 2012
  • To converter time information to digital information Time-to-Digital Converter(TDC) is designed by using analog delay elements. To obtain the temperature stable characteristics the circuit is designed and the operation of the designed circuit is confirmed by HSPICE. The characteristics variation of the designed delay element with temperature is from -0.18% to 0.126% compared to room temperature characteristics when the temperature is varied from $-20^{\circ}C$ tp $70^{\circ}C$. Time difference is from -0.18% to 0.12% compared to room temperature characteristic when the temperature is varied from $-20^{\circ}C$ tp $70^{\circ}C$. The time difference is simulated when the digital output is 15. However the time difference is from -1.09% to 1.28% in the TDC using temperature non-stable analog delay elements.

A 2.4-GHz Low-Power Direct-Conversion Transmitter Based on Current-Mode Operation (전류 모드 동작에 기반한 2.4GHz 저전력 직접 변환 송신기)

  • Choi, Joon-Woo;Lee, Hyung-Su;Choi, Chi-Hoon;Park, Sung-Kyung;Nam, Il-Ku
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.48 no.12
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    • pp.91-96
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    • 2011
  • In this paper, a low-power direct-conversion transmitter based on current-mode operation, which satisfies the IEEE 802.15.4 standard, is proposed and implemented in a $0.13{\mu}m$ CMOS technology. The proposed transmitter consists of DACs, LPFs, variable gain I/Q up-conversion mixer, a divide-by-two circuit with LO buffer, and a drive amplifier. By combining DAC, LPF, and variable gain I/Q up-conversion mixer with a simple current mirror configuration, the transmitter's power consumption is reduced and its linearity is improved. The drive amplifier is a cascode amplifier with gain controls and the 2.4GHz I/Q differential LO signals are generated by a divide-by-two current-mode-logic (CML) circuit with an external 4.8GHz input signal. The implemented transmitter has 30dB of gain control range, 0dBm of maximum transmit output power, 33dBc of local oscillator leakage, and 40dBc of the transmit third harmonic component. The transmitter dissipates 10.2mW from a 1.2V supply and the die area of the transmitter is $1.76mm{\times}1.26mm$.

Digital Control for BUCK-BOOST Type Solar Array Regulator (벅-부스트 형 태양전력 조절기의 디지털 제어)

  • Yang, JeongHwan;Yun, SeokTeak;Park, SeongWoo
    • Journal of Satellite, Information and Communications
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    • v.7 no.3
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    • pp.135-139
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    • 2012
  • A digital controller can simply realize a complex operation algorithm and power control process which can not be applied by an analog circuit for a solar array regulator(SAR). The digital resistive control(DRC) makes an equivalent input impedance of the SAR be resistive characteristic. The resistance of the solar array varies largely in a voltage source region and slightly in a current source region. Therefore when the solar array regulator is controlled by the DRC, the Advanced Incremental Conductance MPPT Algorithm with a Variable Step Size(AIC-MPPT-VSS) is suitable. The AIC-MPPT-VSS, however, using small signal resistance and large signal resistance of the solar array can not limit the absolute value of the solar array power. In this paper, the solar array power limiter is suggested and the BUCK-BOOST type SAR which is fully controlled by the digital controller is verified by simulation.

Development of a Flash ADC with an Analog Memory (아날로그메모리를 이용한 플레쉬 ADC)

  • Chai, Yong-Yoong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.6 no.4
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    • pp.545-552
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    • 2011
  • In this article, reference voltages in a general flash ADC are not obtained from a series of resistors but floating gates. When a behavior model simulation was performed in a pipelined ADC including the suggested flash ADC as a result of an ADC's overall function, it showed results that SNR is approximately 77 dB and resolution is 12 bit. And more than almost 90% showed INL within ${\pm}0.5$ LSB, and like INL, more than 90% showed DNL within ${\pm}0.5$ LSB.

Characterization of Electrical Crosstalk in 1.25 Gbps Optoelectrical Triplex Transceiver Module for Ethernet Passive Optical Networks (이더넷 광 네트워크 구현을 위한 1.25 Gbps 광전 트라이플렉스 트랜시버 모듈의 전기적 혼신의 분석)

  • Kim Sung-Il;Lee Hai-Young
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.42 no.3 s.333
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    • pp.25-34
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    • 2005
  • In this paper, we analyzed and measured the electrical crosstalk characteristics of a triplex transceiver module for ethernet Passive optical networks(EPONS). And we improved the electrical crosstalk levels using Dummy ground lines with signal lines. The triplex transceiver module consists of a laser diode as a transmitter, a digital photodetector as a digital data receiver, and a analog photodetector as a community antenna television signal receiver. And there are integrated on silicon substrate. The digital receiver and analog receiver sensitivity have to meet -24 dBm at $BER=10^{-l2}$ and -7.7 dBm at 44 dB SNR. And the electrical crosstalk levels have to maintain less than -86 dB from DC to 3 GHz. From analysis and measurement results, the proposed silicon substrate structure that contains the Dummy ground line with $100\;{\mu}m$ space from signal lines and separates 4 mm among devices respectively, is satisfied the electrical crosstalk level compared to simple structure. This proposed structure can be easily implemented with design convenience and greatly reduced the silicon substrate size about $50\%$.