共查询到20条相似文献,搜索用时 250 毫秒
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运算放大器和电压比较器测试技术的实践应用 总被引:1,自引:0,他引:1
针对半导体集成电路运算放大器失效模式指出了其测试方法,通过分解半导体集成电路运算 (电压)放大器、电压比较器测试电原理图,说明了该类器件的一些主要性能参数测试原理,介绍了在生产实践中测试技术应用方法和注意事项,提出了生产单位怎样建立完整的运算放大器IC测试系统的构想. 相似文献
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针对微电容超声换能器(CMUT)微弱电流信号检测的要求,设计了一种用于CMUT的前端专用集成电路——运算放大器(OPA)电路。运算放大器电路采用两级放大结构,第一级采用全差分折叠-共源共栅结构,输出级采用AB类控制的轨到轨输出级,在运算放大器电路反相输入端和输出端通过一个反馈电阻实现CMUT电流信号到电压信号的转换。采用GlobalFoundries 0.18μm的标准CMOS工艺进行了仿真设计和流片,芯片尺寸为226μm×75μm。仿真结果表明,运算放大器的开环增益为62 dB,单位增益带宽为30 MHz,在3 MHz处的输入参考噪声电压为2.9μV/Hz1/2,电路采用±3.3 V供电,静态功耗为11 mW。测试结果表明仿真与实测结果相符,该运算放大器电路能够实现CMUT微弱电流信号检测功能。 相似文献
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将正负Wilson电流镜组合在一起,读取由运算放大器构成的电压跟随器的电源引线电流,得到高精度的压控电流源。通过仿真手段研究互补Wilson电流镜组合的电流跟随特性;用通用集成运算放大器和分立BJT(bipolar junction transistors)构成实验测试电路,给出精度、输出阻抗以及频率响应特性的实验测试结果。电路的带宽大大优于运算放大器的单位增益带宽积,体现了电流模电路的优势。当采用CB(complementary bipolar)工艺实现单片集成时,电路的性能更好。还给出了电路的几种改进方案,实验证明,方案是可行的。 相似文献
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集成运算放大器具有成本低、功能多等优点,可广泛用于自动控制系统、测量仪表等其他电子设备中。近年来集成运放的指标在不断提高,性能也在不断提升,伴随着运算放大器的发展,对用来考核运算放大器指标的测试技术也提出了相应的要求,对测试系统(Automatic Testing Equipment,以下简称ATE)的性能要求也相应变高。阐述了单、双电源集成运算放大器在JC-5600ATE上的测试方法,并分析了两者的测试差异。 相似文献
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《现代电子技术》2020,(6):13-17
针对低压低功耗高增益高带宽应用背景的运算放大器,提出一种新型亚阈值有源共源共栅补偿(SACC)运算放大器。通过使用亚阈值跨导提升辅助放大器,以非常低的功耗成本改善整体电路的带宽,同时有效地减小补偿电容的数值,且输出级采用动态前馈结构,显著提升电路摆率。当驱动10 pF容性负载时,放大器的补偿电容仅需60 fF即可实现稳定,从而大大减小了放大器的版图面积。提出的放大器在28 nm CMOS工艺下设计并验证,并且当驱动10 pF的容性负载时,仿真结果表明,在0.9 V电源电压下,可实现69.5 dB的直流增益和13.3 MHz的增益带宽积,且功耗仅为4.5μW。此外,提出的放大器与现有的方案相比较具有更好的品质因数(FOM)。 相似文献
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介绍了超声波测距系统原理,针对超声波测距系统中常用的40 kHz超声波信号,提出了超声波接收电路设计原则,采用了集成运放OP27构成的同相放大器、仪表放大器、CX20106A红外接收芯片3种方案来检测超声波信号,设计了3种方法对应的接收电路,分析了各自的特点。 相似文献
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Vaclav Dolezal 《Circuits, Systems, and Signal Processing》1982,1(2):233-249
Although an operational amplifier is a nonlinear device, the existing methods of analysis of circuits with operational amplifiers view it as a linear element which possibly has an infinite gain. As a result, it is not clear to what extent the results thus obtained hold. In this paper we construct a general model of a (nonlinear) circuit containing operational amplifiers. Viewing such a network as an interconnection of a multiport withn operational amplifiers, we give conditions for solvability (i.e., for the existence of an input-output operator), and establish estimates for the error incurred by replacing such a system by an idealized system whose operational amplifiers have infinite gain. In this way we determine ranges for variables within which the traditional linear analysis gives results that fulfill given accuracy requirements. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1979,67(7):1080-1080
A novel structure for the simulation of an ideal frequency-dependent negative-resistance (FDNR) element based on the single-pole rolloff characteristics of the operational amplifier is reported. The structure uses only operational amplifiers and a resistor. 相似文献
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An efficient measurement technique is introduced for determining the input referred offset voltage induced by electromagnetic interference (EMI) in operational amplifiers. 相似文献
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介绍了一种基于双极工艺的高速宽带运算放大器的设计,从电路结构方面详细论述了电路的宽带设计、高速设计等设计思路,将该电路通过计算机模拟,给出了仿真和测试结果.经过投片验证,设计出的运算放大器满足预期指标,取得了比较满意的结果.该电路在视频放大器、有源滤波器、高速数据转换器等电子系统中有着广泛的应用前景. 相似文献
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基于OA-OTA的多功能电压模式滤波器 总被引:1,自引:0,他引:1
提出了一种由运算放大器(OA)和运算跨导放大器(OTA)构成的多功能电压模式滤波器。适当选定输入输出端,可以实现低通、高通、带通、带阻和全通滤波功能。由于电路仅含有源器件,因而适于全集成,且容易实现电路特性的电调节,中心频率及品质因数的有源灵敏度也很低,PSPICE仿真结果表明,提出的电路方案是可行的。 相似文献
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Because they offer some significant advantages over conventional operational
amplifiers, current feedback operational amplifiers (CFOAs) have been used instead of
voltage operational amplifiers (VOAs) in new implementations of the chaotic Chua’s circuit.
In this study, after giving a comparative investigation of CFOA-based realizations of
Chua’s circuit, we will present an alternative CFOA-based realization of Chua’s circuit
combining the CFOA-based circuit topologies proposed for nonlinear resistor and inductor
elements in the literature. This realization offers an alternative solution for readers studying
Chua’s circuit and high-frequency chaotic oscillations. The PSpice simulation experiments
performed in both the time and frequency domains confirm that the proposed circuit can
generate the original chaotic oscillations of Chua’s circuit and that it exhibits excellent
performance at high frequencies. 相似文献
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电流模式n阶传输函数的OA-OTA实现 总被引:1,自引:0,他引:1
马云辉 《固体电子学研究与进展》2002,22(3):294-296,360
提出了一种新的实现任意 n阶电流模式传输函数的网络结构。该电路仅含运算放大器 (OA)和运算跨导放大器 (OTA)有源器件 ,因而适于全集成。适当设置 OTA的跨导值能实现任意高阶传输函数 ,且传输函数的系数可独立调整。文中推导了滤波器的设计公式 ,并给出了截止频率为 1 0 0 k Hz的三阶巴特沃斯低通滤波器实例 ,PSPICE仿真结果表明所提电路及设计公式是正确的 相似文献
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Hirohisa Ohtsuki Shigeo Kawaoka Shigeru Miyagawa Masaru Ishida Yutaka Fukui 《International Journal of Electronics》2013,100(3):323-331
This paper proposes novel grounded and floating high order series and parallel immittance simulators using operational transconductance amplifiers (OTAs) and operational amplifiers (OAs) with a finite gain–bandwidth (GB) product. They are composed of active devices (OTAs and OAs) and resistances, and are suitable for monolithic implementation in either CMOS or bipolar technologies. They also realize both positive and negative high order immittances. The circuit characteristics can be electronically tuned by adjusting the transconductances of OTAs and the GB products of OAs. Any transfer functions are realizable using the proposed simulators. Two examples are shown, together with simulation results. 相似文献
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Whereas existing methods of lossy/lossless floating-inductance simulation would require two to four operational amplifiers or current conveyors and compulsorily require exact matching of some components, this contribution presents a novel circuit which employs only a single current conveyor along with only three passive components to realise a floating-inductor (parallel RL), without any component-matching requirement. 相似文献