• Title/Summary/Keyword: C-to-SystemC synthesizer

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Design and Implementation of a C-to-SystemC Synthesizer (C-to-SystemC 합성기의 설계 및 구현)

  • You, Myoung-Keun;Song, Gi-Yong
    • Journal of the Institute of Convergence Signal Processing
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    • v.10 no.2
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    • pp.141-145
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    • 2009
  • A C-to-SystemC synthesizer which processes the input behavior according to high-level synthesis, and then transforms the synthesis result into SystemC module code is implemented in this paper. In the synthesis process, the input behavioral description in C source code is scheduled using list scheduling algorithm and register allocation is performed using left-edge algorithm on the result of scheduling. In the SystemC process, the output from high-level synthesis process is transformed into SystemC module code by combining it with SystemC features such as channels and ports. The operation of the implemented C-to-SystemC synthesizer is validated through simulating the synthesis of elliptic wave filter in SystemC code. C-to-SystemC synthesizer can be used as a part of tool-chain which helps to implement SystemC design methodology covering from modeling to synthesis.

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Design and Implementation on Frequency Synthesizer Qualification Model Level for SAR payload (위성 레이다용 QM급 주파수합성기 설계 및 제작)

  • Kim, Dongsik;Kim, Hyunchul;Heo, John;Kim, Wansik
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.20 no.3
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    • pp.9-14
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    • 2020
  • In this paper, Qualification Model of frequency synthesizer is designed for X-band SAR system and performed electrical and environment test. Designed frequency synthesizer generate 13.65 GHz with very low phase noise performance. The integrated phase noise from 10Hz to 1MHz is -37.91 dBc. IRF performances are analyzed according to phase noise and jitter. Also, thermal and structure analysis are achieved for stable operation in space environment. Designed frequency synthesizer is consist of 2 modules of 6U size and generate L-band, C-band, Ku-band. The result of this study would enhance the design ability of RF module and help the frequency synthesizer design for SAR payload system.

Ultra Low Noise Hybrid Frequency Synthesizer for High Performance Radar System (고성능 레이다용 저잡음 하이브리드 주파수합성기 설계 및 제작)

  • Kim, Dong-Sik;Kim, Jong-Pil;Lee, Ju-Young;Kang, Yeon Duk;Kim, Sun-Ju
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.1
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    • pp.73-79
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    • 2020
  • Modern radar system requires high spectral purity and low phase noise characteristics for very low RCS target detection and high resolution SAR (Synthetic Aperture Radar) image. This paper presents a new X-band high stable frequency synthesizer for high performance radar system, which combines DAS (Direct Analog Synthesizer) and DDS (Direct Digital Synthesizer) techniques, in order to cope with very low phase noise and high frequency agility requirements. This synthesizer offers more than 10% operating bandwidth in X-band frequency and fast agile time lower than 1 usec. Also, the phase noise at 10kHz offset is lower than -136dBc/Hz, which shows an improvement of more than 10dB compared to the current state of art frequency synthesizer. This architecture can be applied to L-band and C-band application as well. This frequency synthesizer is able to used in modern AESA (Active Electronically Scanned Array) radar system and high resolution SAR application.

Design of C-Band Frequency Up-Converter in Communication System for Unmanned Aerial Vehicle (무인 항공기의 통신 시스템에 사용되는 C-대역 주파수 상향 변환기 설계)

  • Lee, Duck-Hyung;Oh, Hyun-Seok;Jeong, Hae-Chang;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.9
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    • pp.843-852
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    • 2009
  • In this paper, we present design, fabrication, and measured results for a frequency upconverter for a wireless communication system of UAV(Unmanned Aerial Vehicle). The specifications of such wireless communication system requires the special features of maximum range of communication as well as deployment in UAV and repairing. The frequency upconverter operating at $5.25{\sim}5.45\;GHz$ in C-band was designed and fabricated considering such special features. The AGC function was included because the required output power should be constant for optimal system operation. The fabricated upconverter showed a constant output power of $+2{\pm}0.5\;dBm$ for the $-15{\sim}-10\;dBm$ input. Spuriouses were below -60 dBc and the adjacent leakage power was below -40 dBc. In addition, LO sources in the upconverter was implemented using the frequency synthesizer with step 1 MHz. This is for the application to the situation where multiple UAVs employed and the possible change of the permitted frequency band. The synthesizer showed a phase noise of -100 dBc/Hz at the 100 kHz frequency offset.

FPGA circuit implementation of despreading delay lack loop for GPS receiver and preformance analysis (GPS 수신기용 역확산 지연 동기 루프의 FPGA 회로 구현과 성능 분석)

  • 강성길;류흥균
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.3
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    • pp.506-514
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    • 1997
  • In this paper, we implement digital circuit of despreading delay lock loop for GPS receiver. The designed system consists of Epoch signal generator, two 13bit correlators which correlates the received C/A code and the locally generated C/A code in the receiver, the C/A code generator which generates C/A code of selected satellite, and the direct digital clock synthesizer which generates the clock of the C/A code generator to control the phase and clock rate, the clock controller, and the clock divider. The designed circuit has the function of the acquisition and tracking by the autocorrelation characteristics of Gold code. The controller generates each other control signals according to the correlation value. The designed circuit is simulated to verify the logic functional performance. By using the simulator STR-2770 that generates the virtual GPS signal, the deigned FPGA chip is verified the circuit performance.

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Sound Synthesis of Gayageum using TMS320C6713 DSK (TMS320C6713 DSK 를 이용한 가야금 사운드 합성)

  • Cho, Sang-Jin;Oh, Hoon;Chong, Ui-Pil
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.435-438
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    • 2005
  • In this paper, we implemented a system that is called sound engine in musical synthesizer and synthesized a sound of Gayageum using TMS320C6713 DSK. Sound engine consists of two parts: synthesis algorithm and processor. We improved physical modeling using digital waveguide as a synthesis algorithm and we used TMS320C6713 as a processor. The excitation signals that make timbre are stored in memory. When we input parameters, sound engine synthesizes sound of Gayageum. The experimental result shows that synthesized sounds are very similar to real sounds.

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Radiocarbon Analysis of water Using Direct $CO_2$ Absorption Method (이산화탄소 직접흡수법을 이용한 자연수의 방사성탄소동위원소분석)

  • 고용권;배대석;김천수;김성용
    • Journal of Soil and Groundwater Environment
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    • v.6 no.2
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    • pp.15-22
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    • 2001
  • Radiocarbon ($^{14}C$) and tritium in water have been applied to hydrogeology as a tool for dating of groundwater. The long half-life of $^{14}C$(5,730 years) makes it useful for evaluation of residence time of groundwater, However, the $^{14}C$ has not been applied to groundwater studies in Korea, owing to the absence of preparation line for $^{14}C$ analysis. By this time $^{14}C$ of groundwater has been analyzed mainly using benzene synthesizer, which is so complicate and time-consuming that has been is limitedly applied to hydrogeology. Recently, the direct $CO_2$ absorption method for $^{14}C$ analysis was developed and introduced to KAERI for the evaluation of domestic groundwater system. The results of $^{14}C$ in groundwater would be usefully applied to hydrogeological studies such as the well understanding of groundwater flow system in depth. The reliability of our $^{14}C$ data was confirmed by inter-comparison with the qualified international isotope laboratory.

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Implementation of an Instruction Buffer to process Variable-Length Instructions (가변 길이 명령어 처리를 위한 명령어 버퍼 구현)

  • 박주현;김영민
    • Journal of the Korean Institute of Telematics and Electronics C
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    • v.35C no.12
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    • pp.66-76
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    • 1998
  • In this paper, we implement a buffer capable of handling short loops references to statistically lower the miss rate of variable-length instructions stored in the instruction buffer. MAU(Mark Appending Unit) takes the instructions as they are fetched from external memory, performs some initial decode operations and stores the results of the decode in the buffer for reducing multiple decodes when instructions are executed repeatedly such as in a loop. It includes a decision block of whether hit or not for effectively processing branch instructions Each module of the proposed architecture of processing variable-length instruction is described in VHDL structurally and behaviorally and whether it is working well or not is checked on V-System simulator of Model Technology Inc. We synthesized and simulated the architecture using an ASIC Synthesizer tool with 0.6$\mu\textrm{m}$ 5-Volt CMOS COMPASS library. Operation speed is up to 140MHz. The architecture includes about 17,000 gates.

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A Study on Implementation of 6 Channel DSB Modulator using DDS (DDS(Direct Digital Synthesis)를 이용한 6채널DSB(Double-SideBand) 변조기 구현에 관한 연구)

  • 하재승
    • Journal of the Korea Computer Industry Society
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    • v.2 no.8
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    • pp.1063-1068
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    • 2001
  • In this paper, we designed a high resolution six channel DSB modulator of Acousto-Optic effect generator make use of DDS technology. Also, configured seamless connection for other instruments to use IEEE-488 bus interface. We programmed the device driver for DDS and DAC control by 80C51 assembler language. And, high resolution 6 channel DSB modulator has improved the important characteristics of that the frequency tuning range, the resolution, the switching time. This DSB modulator system can use high precision frequency synthesizer for instruments.

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Gradient Waveform Synthesizer in Magnetic Resonance Imaging System using Digital Signal Processors (DSP를 이용한 자기공명영상시스템의 경사자계 파형 발생기)

  • Go, Gwang-Hyeok;Gwon, Ui-Seok;Kim, Chi-Yeong;Kim, Hyu-Jeong;Kim, Sang-Muk;An, Chang-Beom
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.49 no.1
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    • pp.48-53
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    • 2000
  • In this paper, we develop a TMS320C31 (60MHz) digital signal processor (DSP) board to synthesize gradient waveforms for Spiral Scan Imaging (SSI), which is one of the ultra fast magnetic resonance imaging (MRI) methods widely used. In SSI, accurate gradient waveforms are very essential to high quality magnetic resonance images. For this purpose, sampling rate for synthesizing the gradient waveforms is set twice as high as the data sampling rate. With the developed DSP boards accurate gradient waveforms are obtained. Ultra fast spiral scan imaging with the developed with the developed DSP board is currently under development.

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