• Title/Summary/Keyword: logic gate delay

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Implementation of the Digital Current Control System for an Induction Motor Using FPGA (FPGA를 이용한 유도 전동기의 디지털 전류 제어 시스템 구현)

  • Yang, Oh
    • Journal of the Korean Institute of Telematics and Electronics C
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    • v.35C no.11
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    • pp.21-30
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    • 1998
  • In this paper, a digital current control system using a FPGA(Field Programmable Gate Array) was implemented, and the system was applied to an induction motor widely used as an industrial driving machine. The FPGA designed by VHDL(VHSIC Hardware Description Language) consists of a PWM(Pulse Width Modulation) generation block, a PWM protection block, a speed measuring block, a watch dog timer block, an interrupt control block, a decoder logic block, a wait control block and digital input and output blocks respectively. Dedicated clock inputs on the FPGA were used for high-speed execution, and an up-down counter and a latch block were designed in parallel, in order that the triangle wave could be operated at 40 MHz clock. When triangle wave is compared with many registers respectively, gate delay occurs from excessive fan-outs. To reduce the delay, two triangle wave registers were implemented in parallel. Amplitude and frequency of the triangle wave, and dead time of PWM could be changed by software. This FPGA was synthesized by pASIC 2SpDE and Synplify-Lite synthesis tool of Quick Logic company. The final simulation for worst cases was successfully performed under a Verilog HDL simulation environment. And the FPGA programmed for an 84 pin PLCC package was applied to digital current control system for 3-phase induction motor. The digital current control system of the 3 phase induction motor was configured using the DSP(TMS320C31-40 MHz), FPGA, A/D converter and Hall CT etc., and experimental results showed the effectiveness of the digital current control system.

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An Implemention of Low Power 16bit ELM Adder by Glitch Reduction (글리치 감소를 통한 저전력 16비트 ELM 덧셈기 구현)

  • 류범선;이기영;조태원
    • Journal of the Korean Institute of Telematics and Electronics C
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    • v.36C no.5
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    • pp.38-47
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    • 1999
  • We have designed a 16bit adder which reduces the power consumption at each level of architecture, logic and transistor. The conventional ELM adder has a major disadvantage which makes glitch in the G cell when the particular input bit patterns are applied, because of the block carry generation signal computed by the input bit pattern. Thus, we propose a low power adder architecture which can automatically transfer each block carry generation signal to the G cell of the last level to avoid glitches for particular input bit patterns at the architecture level. We also use a combination of logic styles which is suitable for low power consumption with static CMOS and low power XOR gate at the logic level. Futhermore, The variable-sized cells are used for reduction of power consumption according to the logic depth of the bit propagation at the transistor level. As a result of HSPICE simulation with $0.6\mu\textrm{m}$ single-poly triple-metal LG CMOS standard process parameter, the proposed adder is superior to the conventional ELM architecture with fixed-sized cell and fully static CMOS by 23.6% in power consumption, 22.6% in power-delay-product, respectively.

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Macromodel for Short Circuit Power and Propagation Delay Estimation of CMOS Circuits

  • Jung, Seung-Ho;Baek, Jong-Humn;Kim, Seok-Yoon
    • Proceedings of the IEEK Conference
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    • 2000.07b
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    • pp.1005-1008
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    • 2000
  • This paper presents a simple method to estimate short-circuit power dissipation and propagation delay for static CMOS logic circuits. Short-circuit current expression is derived by accurately interpolating peak points of actual current curves which is influenced by the gate-to-drain coupling capacitance. The macro model and its expressions estimating the delay of CMOS circuits, which is based on the current modeling expression, are also proposed after investigating the voltage waveforms at transistor output modes. It is shown through simulations that the proposed technique yields better accuracy than previous methods when signal transition time and/or load capacitance decreases, which is a characteristic of the present technological evolution.

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A $3{\mu}m$ Standard Cell Library Implemented in Single Poly Double Metal CMOS Technology ($3{\mu}m$ 설계 칫수의 이중금속 CMOS 기술을 이용한 표준셀 라이브러리)

  • Park, Jon Hoon;Park, Chun Seon;Kim, Bong Yul;Lee, Moon Key
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.24 no.2
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    • pp.254-259
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    • 1987
  • This paper describes the CMOS standard cell library implemented in double metal single poly gate process with 3\ulcornerm design rule, and its results of testing. This standard cell library contains total 33 cells of random logic gates, flip-flop gates and input/output buffers. All of cell was made to have the equal height of 98\ulcornerm, and width in multiple constant grid of 9 \ulcornerm. For cell data base, the electric characteristics of each cell is investigated and delay is characterized in terms of fanout. As the testing results of Ring Oscillator among the cell library, the average delay time for Inverter is 1.05 (ns), and the delay time due to channel routing metal is 0.65(ps)per unit length.

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A Design of Parity Checker/Generator Using Logic Gate for Low-Power Consumption (저 전력용 논리회로를 이용한 패리티체커 설계)

  • Lee, Jong-Jin;Cho, Tae-Won;Bae, Hyo-Kwan
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.38 no.2
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    • pp.50-55
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    • 2001
  • In this paper, a 8bit parity checker/generator is designed using a new gate which is proposed to implement the exclusive or(XOR) and exclusive-nor(XNOR) functions for low power consumption on transistor level. Conventional XOR/XNOR gate such as CPL, DPL and CCPL designed to reduce the power consumption has an inverter to get the full swing output signals. But this inverter consumes the major part of power and causes the time delay on CMOS circuits. Thus a new technique was adopted not utilizing inverter in the circuits. The results of simulation by Hspice shows 33% of power reduction compared with CCPL gate when A 8 bit parity checker was made with the proposed new gate using $0.8{\mu}mCMOS$ technology.

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Design of the timing controller for automatic magnetizing system

  • Yi Jae Young;Arit Thammano;Yi Cheon Hee
    • Proceedings of the IEEK Conference
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    • 2004.08c
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    • pp.468-472
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    • 2004
  • In this paper a VLSI design for the automatic magnetizing system has been presented. This is the design of a peripheral controller, which magnetizes CRTs and computers monitors and controls the automatic inspection system. We implemented a programmable peripheral interface(PPI) circuit of the control and protocol module for the magnetizer controller by using a O.8um CMOS SOG(Sea of Gate) technology of ETRI. Most of the PPI functions has been confirmed. In the conventional method, the propagation/ramp delay model was used to predict the delay of cells, but used to model on only a single cell. Later, a modified "apos;Linear delay predict model"apos; was suggested in the LODECAP(LOgic Design Capture) by adding some factors to the prior model. But this has not a full model on the delay chain. In this paper a new "apos;delay predict equationapos;" for the design of the timing control block in PPI system has been suggested. We have described the detail method on a design of delay chain block according to the extracted equation and applied this method to the timing control block design.

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Design and Implementation of Multi-channel FFT Processor for MIMO Systems (MIMO 시스템을 위한 다채널 FFT 프로세서의 설계 및 구현)

  • Jung, Yongchul;Cho, Jaechan;Jung, Yunho
    • Journal of Advanced Navigation Technology
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    • v.21 no.6
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    • pp.659-665
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    • 2017
  • In this paper, a low complexity fast Fourier transform(FFT) processor is proposed for multiple input multiple output(MIMO) systems. The IEEE 802.11ac standard has been adopted along with the demand for a system capable of high channel capacity and Gbps transmission in order to utilize various multimedia services using a wireless LAN. The proposed scalable FFT processor can support the variable length of 64, 128, 256, and 512 for 8x8 antenna configuration as specified in IEEE 802.11ac standard with MIMO-OFDM scheme. By reducing the required number of non-trivial multipliers with mixed-radix(MR) and multipath delay commutator(MDC) architecture, the complexity of the proposed FFT processor was dramatically decreased. Implementation results show that the proposed FFT processor can reduced the logic gate count by 50%, compared with the radix-2 SDF FFT processor. Also, compared with the 8-channel MR-2/2/2/4/2/4/2 MDC processor and 8-channel MR-2/2/2/8/8 MDC processor, it is shown that the gate count is reduced by 18% and 17% respectively.

Design and Implementation of Direct Torque Control Based on an Intelligent Technique of Induction Motor on FPGA

  • Krim, Saber;Gdaim, Soufien;Mtibaa, Abdellatif;Mimouni, Mohamed Faouzi
    • Journal of Electrical Engineering and Technology
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    • v.10 no.4
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    • pp.1527-1539
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    • 2015
  • In this paper the hardware implementation of the direct torque control based on the fuzzy logic technique of induction motor on the Field-Programmable Gate Array (FPGA) is presented. Due to its complexity, the fuzzy logic technique implemented on a digital system like the DSP (Digital Signal Processor) and microcontroller is characterized by a calculating delay. This delay is due to the processing speed which depends on the system complexity. The limitation of these solutions is inevitable. To solve this problem, an alternative digital solution is used, based on the FPGA, which is characterized by a fast processing speed, to take the advantage of the performances of the fuzzy logic technique in spite of its complex computation. The Conventional Direct Torque Control (CDTC) of the induction machine faces problems, like the high stator flux, electromagnetic torque ripples, and stator current distortions. To overcome the CDTC problems many methods are used such as the space vector modulation which is sensitive to the parameters variations of the machine, the increase in the switches inverter number which increases the cost of the inverter, and the artificial intelligence. In this paper an intelligent technique based on the fuzzy logic is used because it is allows controlling the systems without knowing the mathematical model. Also, we use a new method based on the Xilinx system generator for the hardware implementation of Direct Torque Fuzzy Control (DTFC) on the FPGA. The simulation results of the DTFC are compared to those of the CDTC. The comparison results illustrate the reduction in the torque and stator flux ripples of the DTFC and show the Xilinx Virtex V FPGA performances in terms of execution time.

Design of Low Power and High Speed NCL Gates (저전력 고속 NCL 비동기 게이트 설계)

  • Kim, Kyung Ki
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.2
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    • pp.112-118
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    • 2015
  • Conventional synchronous circuits cannot keep the circuit performance, and cannot even guarantee correct operations under the influence of PVT variations and aging effects in the nanometer regime. Therefore, in this paper, a DI (delay insensitive) design based NCL (Null Convention Logic) design methodology with a very simple design structure has been used to design digital systems, which is one of well-known asynchronous design methods robust to various variations and does not require any timing analysis. Because circuit-level structures of conventional NCL gates have weakness of low speed, high area overhead or high wire complexity, this paper proposes a new lNCL gates designed at the transistor level for high-speed, low area overhead, and low wire complexity. The proposed NCL gate libraries have been compared to the conventional NCL gates in terms of circuit delay, area and power consumption using a asynchronous multiplier implemented in dongbu 0.11um CMOS technology.

Analysis of Positive Logic and Negate Logic in 1bit adder and 4 bit adder 74LS283 (1bit 전 가산기와 4bit 덧셈 연산기 74LS283에서 의정 논리와 부 논리에 대한 분석)

  • Chung, Tong-Ho;Chung, Tea-Sang;You, Jun-Bok
    • Proceedings of the KIEE Conference
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    • 2000.11d
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    • pp.781-783
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    • 2000
  • 1bit full adder have 3 input (including carry_in) and 2 outputs(Sum and Carry_out). Because of 1 bit full adder's propagation delay. We usually use 4-bit binary full adder with fast carry, 74LS283. The 74LS283 is positive logic circuit chip. But the logic function of binary adder is symmetrical, so it can be possible to use it not only positive logic but also the negative logic. This thesis use symmetrical property. such as $C_{i+1}(\bar{a_i}\bar{b_i}\bar{c_i})=C_{i+1}{\bar}(a_i,\;b_i,\;c_i)$ and $S_i(\bar{a_i}\bar{b_i}\bar{c_i})=\bar{S_i}(a_i,\;b_i,\;c_i)$. And prove this property with logic operation. Using these property, the 74LS283 adder is possile as the negation logic circuit. It's very useful to use the chip in negative logic. because many system chip is negative logic circuit. for example when we have negative logic chip with 74LS283. we don't need any not gate for 74LS283 input, and just use output of adder(74LS283) as the negation of original output.

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