DESIGN OF TERNARY CURRENT-MODE CMOS CIRCUITS BASED ON SWITCH-SIGNAL THEORY

By applying switch-signal theory, the interaction between MOS transmission switch-ing transistor and current signal in current-mode CMOS circuits is analyzed, and the theory oftransmission current-switches which is suitable to current-mode CMOS circuits is proposed. Thecircuits, such as ternary full-adder etc., designed by using this theory have simpler circuit struc-tures and correct logic functions. It is confirmed that this theory is efficient in guiding the logicdesign of current-mode CMOS circuits at switch level.

A review on the design of ternary logic circuits

A multi-valued logic system is a promising alternative to traditional binary logic because it can reduce the complexity,power consumption, and area of circuit implementation. This article briefly summarizes the development of ternary logic and its advantages in digital logic circuits. The schemes, characteristics, and application of ternary logic circuits based on CMOS, CNTFET, memristor, and other devices and processes are reviewed in this paper, providing some reference for the further research and development of ternary logic circuits.

CircuitVerse:A Simulator for Teaching and Learning of Digital Logic Circuit

Digital Logic is a fundamental course of majors in electronic information.The simulation experiment is an essential measure to help students understand the principles of digital logic.It can improve the efficiency of physical experiments and decrease instrument damage caused by operating errors.CircuitVerse is an open-source and Web-based tool of circuit design and simulation for teaching purposes.And now,teachers and students in many colleges and universities use it to assist teaching and learning.Firstly,through a particular example,the features of CircuitVerse and its usage are explained.Secondly,we briefly introduce the application of CircuitVerse in our teaching as well as the following development plans.We believe that our introduction can help teachers understand the software and how to make full use of this tool.

DESIGN OF SYMMETRIC TERNARY CURRENT-MODE CMOS CIRCUITS

By applying switch-signal theory, the theory of transmission current-switches based on symmetric ternary logic is proposed, this theory is suitable to design symmetric ternary current-mode CMOS circuits. The symmetric ternary current-mode CMOS circuits designed by using this theory not only have simpler circuit structures and correct logic functions, but also can process bidirectional signals.

SWITCHED-CURRENT FILTER DESIGN USING CASCADED SECTIONS

A new analogue sampled-data active device, named as a switched-current operationalamplifier (SIOA), is presented. The use of active circuit elements may simplify drawing the circuitdiagram significantly greatly and may permit easier analysis and synthesis of SI networks. Anumber of all pole and elliptic (second-or third-order) switched-current (SI) filters are derivedfrom the switched capacitor prototypes. These can be used as simple self-contained filters or asfilter sections in the cascaded realizations of a higher order transfer functions. To illustrate theapproach, a fifth-order low-pass filter is designed.

Design theory of digital circuits at switch level

By analysing problems in the traditional design theory of digital circuits it is proposed that both switching variable and signal variable should be adopted for describing the switching state of internal elements and signal in digital circuits respectively.Based on the above viewpoint the switch-signal theory is established.According to the working principle in CMOS circuits,the related design technique at switch level is developed.By using the practical design examples it is shown that the circuits designed at switch level have simpler structures than their counterparts designed at the traditional gate level since the switch transistors are used as construction units in designs.

寻求共鸣:数字化转型中教学设计的底层逻辑

数字化转型推动第一代教学设计转向第二代教学设计时,也造成教学设计过程简单化、教学设计结构程序化、教学设计偏离学习者个性化学习需求等异化现象。哈特穆特·罗萨的共鸣理论提倡重构人与世界的共鸣关系,化解人类对世界的掌控欲望导致的异化关系问题,为教学设计回归能动性、文化性和情境性等生命隐喻提供了底层支撑。寻求共鸣的教学设计是指遵循“为了共鸣设计教学”的理念,围绕学习者与教学内容的触动产生而重组文本,并以此来设计诸多教学要素,形成预设教学方案的过程。文章对寻求共鸣的教学设计理念、原则、要素和运行结构进行了探讨,并提出寻求共鸣的教学设计操作要领是基于“人机协同”的学习者先前经验获取、基于学习者过往经验的综合任务设计、形成激发共鸣的认知策略、建构以技术为支撑的开放性环境、在教学活动设计中注入共鸣的力量,以及促进共鸣的反馈体系建构。

基于数字电路芯片的电子密码锁设计

产品更新迭代,现在人们使用的防盗手段,已经从传统的机械锁转变到电子密码锁。该设计提出一种基于数字电路芯片的电子密码锁设计方法,以数字芯片为核心设计逻辑电路,克服机械式密码锁密码量少、安全性差的缺点。该系统具有密码设置、按键提示音、记录输入密码错误次数、3次密码错误后触发报警和输入正确密码有指示灯等功能,具有成本低廉、功能实用的特点。

基于ICL7135的试验测试用4-1/2位数字电压表1/2位消隐功能的实现

可靠性和环境试验的性能测试中,常常需要用到以数字电压表为核心的数字化仪表。当设计一个基于ICL7135芯片的4-1/2位数字电压表电路时,需要对数字显示部分进行首位消隐的功能设计,传统的数字电压表电路中利用单片机的程序控制实现消隐,当设计电路中不采用单片机时,需考虑新的设计实现首位消隐。本文利用电压表电路中CD4511译码芯片的消隐端,结合A/D芯片的输出信号,设计一个复合逻辑门电路,实现对电路的首位正确消隐。经实验验证,复合逻辑门电路的设计思路是可行的,能保证数字电压表电路首1/2位消隐功能的实现。

High performance integrated photonic circuit based on inverse design method

The basic indexes of all-optical integrated photonic circuits include high-density integration,ultrafast response and ultralow energy consumption.Traditional methods mainly adopt conventional micro/nano-structures.The overall size of the circuit is large,usually reaches hundreds of microns.Besides,it is difficult to balance the ultrafast response and ultra-low energy consumption problem,and the crosstalk between two traditional devices is difficult to overcome.Here,we propose and experimentally demonstrate an approach based on inverse design method to realize a high-density,ultrafast and ultra-low energy consumption integrated photonic circuit with two all-optical switches controlling the input states of an all-optical XOR logic gate.The feature size of the whole circuit is only 2.5μm×7μm,and that of a single device is 2μm×2μm.The distance between two adjacent devices is as small as 1.5μm,within wavelength magnitude scale.Theoretical response time of the circuit is 150 fs,and the threshold energy is within 10 fJ/bit.We have also considered the crosstalk problem.The circuit also realizes a function of identifying two-digit logic signal results.Our work provides a new idea for the design of ultrafast,ultra-low energy consumption all-optical devices and the implementation of high-density photonic integrated circuits.

DESIGN OF nMOS QUATERNARY FLIP-FLOPS AND THEIR APPLICATIONS

By using the theory of clipping voltage-switches, two kinds of master/slave nMOS quaternary flip-flops are designed. These flip-flops have the capability of two-input presetting and double-rail complementary outputs. It is shown that these flip-flops are effectively suitable to design nMOS quaternary sequential circuits by designing two examples of hexadecimal up-counter and decimal up-counter.

DESIGN OF TERNARY COUNTER BASED ON ADIABATIC DOMINO CIRCUIT

By researching the ternary counter and low power circuit design method, a novel design of low power ternary Domino counter on switch-level is proposed. Firstly, the switch-level structure expression of ternary loop operation circuit with enable pin is derived according to the switch-signal theory, and the one bit ternary counter is obtained combining the ternary adiabatic Domino literal operation circuit and buffer. Then the switch-level structure expression of enable signal circuit is derived, and the four bits ternary counter is obtained by cascade connection. Finally, the circuit is simulated by Spice tool and the output waveforms transform in proper order indicating that the logic function is correct. The energy consumption of the four bits ternary adiabatic Domino counter is 63% less than the conventional Domino counterpart.

A NEW MULTIFUNCTION SWITCHED-CURRENT FILTER

A new switched-current(SI)biquadratic filter is presented which can simultaneouslyprovide the low-pass,high-pass and band-pass filters in a single building block.A symbol torepresent the universal SI integrator is also introduced.It can simplify the analysis and synthesisof SI networks.

“金课”建设下数字电路与逻辑设计实践教学改革

以往的数字电路与逻辑设计课程教学中注重知识的传授,实践教学多为课程配套的验证性实验。传统的基于书面考试的课程考核方式使学生的注意力集中在课程的理论知识点上,学生对数字电路与逻辑设计系统不能形成一个完整的认识。当遇到实际复杂工程问题时,既不能有效分析问题也不能解决问题,与“金课”的创新性、挑战度和高阶性的要求相差甚远。数字电路与逻辑设计实践教学改革以基于设计的工程学习为教学目标,以项目为驱动让学生学会设计构建一个完整的数字电路与逻辑设计系统。从教学内容、教学方法、教学模式、课程评价几个方面开展实质性的改革与试验,培养多维能力,激发学生兴趣,助推“金课”建设。

基于逻辑电路CD4066的数字水位控制器设计

太阳能热水器等家用设备供水控制需要使用水位控制器,但基于单片机或复杂计算机系统水位控制技术因为整体价格较高,在太阳能热水器等产品的应用上仍受到经济方面的限制。为此设计了一款基于逻辑电路CD4066的数字水位控制器,准确控制水箱水位,合理控制用水,达到节水目的。本装置利用水的电导性,连续全时段测量水位变化,把测量到的水位转换成相应的电信号,控制逻辑电路接收到该信号后,通过处理,实现水位显示、报警及自动控制等功能。与现有控制水位系统相比,本装置选用的芯片为常用芯片,系统造价低、控制效果好,有助于实现水资源的精细利用,具有广泛的应用场景。

Design Technique of I^2L Circuits Based on Multi-Valued Logic

This paper proposes the use of the current signal to express logic values and establishes the theory of grounded current switches suitable for I2L circuits.Based on the advantage that current signals are easy to be added, the design technique of I2L circuits by means of the multi-valued current signal is proposed.It is shown that simpler structure of I2L circuits can be obtained with this technique.

带数字驱动的DC-18 GHz单刀三掷开关设计

设计了一款带数字驱动的DC-18 GHz单刀三掷开关(Single-Pole Three-Throw,SP3T)芯片。该芯片集成了单刀三掷开关和数字驱动器。单刀三掷开关由2个单刀双掷开关级联组成。单刀双掷开关采用吸收式开关结构,可以实现更好的关态驻波比。驱动电路采用直接耦合场效应晶体管逻辑(Direct Coupled Field Effect Transistor Logic,DCFL)式逻辑电路,具有结构简单、功耗低的优点。版图经过合理布局后,芯片尺寸为1.5 mm×2 mm。测试结果表明:在DC-18 GHz频段内,芯片插入损耗小于3.5 dB,隔离度大于50 dB。芯片采用5 V/0 V逻辑控制,开关速度小于8 ns,1 dB压缩输入功率23 dBm。

“数字电路与逻辑设计”课程改革研究

针对工程教育认证中对电类专业本科毕业生提出的12方面要求,结合电气专业“数字电路与逻辑设计”课程授课经验,提出从教学大纲、实践教学、教学方法等几方面进行改革探索,另提出将课程思政、OBE教学理念等教学理念融入教学过程中,以此来提高课堂授课效果,培养学生创新意识和动手能力,促进学生团队合作意识,让学生毕业5年后达到既定的培养目标。

数字电子EDA的混合式教学实践

阐述融合EDA技术的数字电子技术课程混合式教学实践方法,EDA技术的教学设计、验证典型逻辑电路功能、混合式教学互动、EDA技术与实验教学的融合。

基于IO的SSI信号数据采集仪的设计

SSI信号接口是绝对角度编码器最常见的信号输出方式,然而工控机和单片机普遍没有SSI接口。为解决这一问题,该文提出了一种通用的通过IO信号模拟SSI编码器通信协议的方法,设计了一种用于读取SSI编码器位置信号的数据采集仪。数据采集仪不仅实现了输出信号角度的数值显示,还可以实现与上位机通信,将位置数据传送到上位机进行处理,通过在某型号产品专用设备二维自动转台上应用和验证,结果表明:该数据采集仪采集的位置数据准确,工作稳定可靠,具有很好的应用价值。