集成运放在烟雾报警器电路中的应用

集成电路采用半导体集成工艺,把二极管、三极管、电阻、电容及导线集中制作在一块半导体基片上,组成管体一路,再用塑料或陶瓷封装,制成集成电路。与分立元件电路相比,集成电路具有性能好、体积小、外部接线少、功耗低、可靠性高、灵活性高、价格低等优点。随着电子技术的不断发展,集成运放作为一种具有很高开环电压放大倍数的直接耦合放大器,广泛用于模拟运算、信号处理、测量技术、自动控制等领域。     

集成运放在音频电路中的应用

长期以来,分立件构成的音频放大电路在Hi-Fi音响中占据着主导地位。但随着集成运放性能的改善,以及数字音源的出现,这一状况有了很大的改变。     

集成运放的互阻抗放大技术应用

本文对集成运放在电子技术应用中互阻抗放大技术进行了分析讨论，给出了相应的典型应用实例，具有重要的推广应用价值。     

集成运放的互阻抗放大技术应用

本文对集成运放在电子技术应用中互阻抗放大技术进行了分析讨论，给出了相应的典型应用实例，具有重要的推广应用价值。     

集成运放在应用中的性能提高与改善

介绍几种改善集成运放性能的方法。利用常用运放有效改善集成运放的主要指标。     

集成运放放大电路的噪声分析

根据叠加原理与噪声等效电路理论,推导出集成运放同相放大电路和反相放大电路的噪声系数计算公式,并分析了反馈网络对集成运放放大电路的噪声贡献,给出忽略反馈电阻热噪声的条件。     

简述集成运放的热电偶测温电路

本文介绍了热电偶基本知识,重点简述了K型热电偶测温原理以及利用集成运算放大器构成测温电路的测温实验过程。     

高性能集成运放的教学与应用

论述了高性能集成运放教学的必要性、必要的知识铺垫和主要知识点。列举了三种不同高性能运放的应用实例。     

集成运放的前置放大应用

对集成运放的前置放大应用中出现的若干技术问题进行了分析，给出了相应的典型应用实例。     

基于Protues的集成运放非线性应用仿真

集成运算放大器是电子系统中最重要的模拟器件。它的应用主要分为线性应用和非线性应用。在非线性应用中,运算放大器构成的单门限电压比较器、迟滞比较器是构成矩形波、三角波和锯齿波等信号产生电路的核心模块。在此主要讨论利用Protues平台对集成运放的非线性应用设计及仿真。     

集成运算放大器的特性及应用

集成运算放大器是放大电路中非常重要的元器件,可靠性高,使用方便,随着技术指标的不断提高,它可当作理想器件来处理.不会造成不可允许的误差。在学习时应熟练掌握它的线性与非线性特性以及其在信号的运算、处理和电路的比较分析等方面的相关应用。     

Design and operational issues of VSAT application in ISDN-typenetworks

Advances in satellite technology in the area of very small aperture terminals (VSATs) offer economical data and voice services for corporate networks and rural applications. The authors describe VSAT application and technology with emphasis on analyzing the issues of quality after the sale. The quality and maintenance requirements of the VSAT networks in operation are defined. The reliability, maintainability, and availability calculations for VSAT networks with different topologies are evaluated. Results show that both star and point-to-point VSAT networks are capable of meeting higher availability standards     

MOS-C single amplifier biquads using the operational transresistance amplifier

A configuration for the realization of voltage-mode second-order filters employing a single operational transresistance amplifier (OTRA) as the active element is presented. This topology can synthesize lowpass, highpass, bandpass, notch and allpass filtering functions. The presented filters are suitable for MOS-C implementation, yielding the filter parameters to be electronically tunable. Theoretical analysis is verified with PSPICE simulation.     

Effects of finite operational amplifier gain-bandwidth product on a switched-capacitor amplifier

The effects of the finite operational amplifier gain-bandwidth product GB on the performance of an inverting switched-capacitor amplifier are presented. Limitations of the GB and the clock frequency fc=1/T as well as GB.T are determined.     

Computer simulation of operational amplifier

A technique for the computer simulation of an op-amp is described. Results of the simulation of an inverting integrator configuration using this technique is also presented.     

ADI公司双极性四通道运算放大器 OP4177及其应用

介绍了ADI公司高性能双极性运算放大器OP4177．以及在低电压便携式应用中一种简单的支持OP4177实现双极性运算的正负电源供电方案。     

Design and applications of the operational floating amplifier (OFA): The most universal operational amplifier

The operational floating amplifier (OFA) is the most universal type of operational amplifier. Both input and output ports are floating ports, i.e., free from restrictive ground connections. The floating input port enables the OFA to accurately equate two voltages between the two input terminals, like a standard operational amplifier, but in addition to that the OFA is able to accurately equate two currents through the two terminals of the floating output port. Specific applications are given, such as current amplifiers, voltage-to-current converters, gyrators, hybrids, and filters. The concept of the OFA allows these analog transfer functions to be realized with the absolute minimum number of accurate internal and external elements necessary to accurately determine the transfer. The OFA does not need accurate internal matched elements, except for offset, to obtain accurate overall transfer functions. This is in contrast to other current-output devices, such as the current conveyer, which transfer depends on the accuracy of internal current mirrors. Several designs of class A and class AB OFAs based on different topologies are presented and compared. This paper gives an overview of the application, the specification, and the design.     

基于运放的窄带滤波器设计

针对单一无源滤波器或有源滤波器的衰减特性不够陡峭的问题,设计了基于运放的窄带滤波器。所设计的窄带滤波器采用了无源电路和有电源路相结合的方法,使Q值很容易达到设计要求。实验结果表明:混合结构的窄带滤波器过渡带窄,衰减特性陡峭,滤波效果优于单独使用的无源滤波器;在应用范围和造价上又优于单独使用的有源滤波器。当其用于强电力线干扰下的线路故障测试仪的信号检测时,获得较理想的效果。     

Evolution of high-speed operational amplifier architectures

Strengths and weaknesses of modern wide-bandwidth bipolar transistor operational amplifiers are investigated and compared with respect to bandwidth, slew rate, noise, distortion, and power. This paper traces the evolution of operational amplifier designs since vacuum tube days to give a perspective of the large number of circuit variations used over time. Of particular value is the ability to use many of these circuit design options as the basis of new amplifiers. In addition, an array of operational amplifier components fabricated on the AT&T CBIC V2 process is described. This design incorporates many of the architectural techniques that have evolved over the years to produce four separate operational amplifier on a single base wafer. The process design methodology requires identifying the common elements in each architecture and the minimum number of additional components required to implement four unique architectures on the array     

一款高性能共源共栅运算放大器设计

基于CSMC 0.5μm标准CMOS工艺,采用复用型折叠式共源共栅结构,设计一种折叠式共源共栅运算放大器。该电路在5V电源电压下驱动5pF负载电容,采用Cadence公司的模拟仿真工具Spectre对电路进行仿真。结果表明,电路开环增益达到了71.7dB,单位增益带宽为52.79MHz,开环相位裕度为60.45°。