基于MO-OTA-C的n阶通用电流模式滤波器

以OTA-C为基本模块,在其输入端加入一个电流信号,使输出电流受其控制,然后利用多端输出(MO)的OTA-C实现n阶通用电流模式滤波器的设计。该滤波器能实现低通、高通、带通、带阻和全通功能,n阶滤波器仅需要n个OTA和n个电容,便于集成。以三阶Butterworth滤波器为例,进行低通、带通和高通仿真。理论分析与Spice仿真表明,所设计的滤波器结构正确可行。     

电流模式CMOS OTA滤波器实现

本文提出了利用ＣＭＯＳ ＯＴＡ综合连志时间电流模式滤波器的方法。应用信号流图模拟，系统地生成了二阶ＣＭＯＳ ＯＴＡ电流滤波器。分析了ＯＴＡ的非理想因素对滤波器高频性能的影响，并给出了简单的高频补偿方案。     

n阶传输函数的CC实现

本文提出了两个基于积分器的通用CC网络结构。该结构是在典型FLF结构的基础上增加输入分布和输出求和CC网络生成的。适当设置输入分布和输出求和CC网络元件参数,能实现任意高阶传输函数。文中给出了系统的设计公式。     

电流模式n阶OTA—C滤波器的设计

提出了设计电流模式ｎ阶ＯＴＡ－Ｃ滤波器的新方法：使用单端输入，双端输出的电流放大器及单端输入，三端输出的电流积分器对ｎ阶电流传递函数的信号流图进行综合。     

n阶电流转移函数的OTA实现

提出了设计n阶电流模式滤波器的一般方法，基于信号流图并采用OTA实现，得到了n阶电流型OTA滤波器电路。     

通用有源电流模式滤波器

提出了两种通用有源电流模式滤波器：１．用两个电流传送器（ＣＣＩＩ）实现的电流模式三介滤波器新电路,选择不同的输入信号组合即能获得低通、高通、带通、陷波和全通五种二阶滤波函数;２．由ＣＣＩＩ和多输出地运算放大器（ＯＴＡ）实现的单输入多输出滤波器新电路、所提电路结构简单、中心频率ω０和品质因数Ｑ独立可调、无源元件人武部接地,滤波器特性参数对的元件灵敏度低,理论分析和计算机仿真表明所提电路方案正确。     

基于OA-OTA的多功能电压模式滤波器

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。     

电流模式CMOS OTA滤波器实现

本文提出了利用CMOS OTA综合连续时间电流模式滤波器的方法。应用信号流图模拟,系统地生成了二阶CMOS OTA电流滤波器。分析了OTA的非理想因素对滤波器高频性能的影响,并给出了简单的高频补偿方案。最后,给出了一个四阶巴特沃思低通滤波器的设计实例并经PSPICE仿真证实。     

用CMOS集成跨导器实现通用电流传递函数

本文用COMS集成跨导器实现了通用电流传递函数，以三阶巴特活思高通滤波器传递函数的实现电路为例，进行了MOS管级的PSPICE模拟，结果表明所提出的方法的可行性。     

单MDDCC多功能电流模式二阶滤波器的实现

提出一种单MDDCC三输入、单输出多功能电流模式二阶滤波器结构电路。该电路仅由单个DDCC有源器件及5个RC无源元件构成,能产生二阶高通、低通及带通滤波器。电路具有结构简单,灵敏度低,滤波器固有频率ω0和品质因数Q相互独立可调,便于集成。最后对所提出的滤波器进行了HSpice仿真,理论分析和计算机仿真表明电路方案正确有效。     

用CMOS跨导单元实现电流模式全极点低通滤波器

提出了用CMOS跨导单元和电容实现电流模式全极点低通滤波器的技术。这一技术基于无源LC梯型电路的模拟，具有电路结构简单、灵敏度低，适合于全集成之特点。     

Analog Circuit Synthesis Using Linear and Nonlinear Current Amplifiers

Various design techniques are presented for obtaining current-mode filters suitable for operation at high frequencies. For this purpose CMOS and or bipolar current amplifiers are used as active building blocks. The derived circuits simulate LC passive prototype filters. Second order resonators can also be obtained by following the same techniques. The presented circuits are modular in structure, thus, their electronic and layout design is very easy. Low-voltage, low-power design is also feasible. Simulation examples for all-pole filters and filters with transmission zeros are given. George Souliotis received the B.Sc. degree in physics from the University of Ioannina, Ioannina, Greece, in 1993 and the M.Sc. and Ph.D. degrees in electronics from the University of Patras, Patras, Greece, in 1998 and 2003, respectively. From 2000 to 2002, he was with Giga Hellas, an Intel company, designing high-speed electronic circuits for transceivers for optical networks. He is co-inventor of a patent that was developed through that work. He is currently a Post-Doctoral Researcher with the Electronics Laboratory, Department of Physics, University of Patras, Patras, Greece. His research interests include analog and mixed signal integrated circuits for high-speed communication applications, current mode circuits, continuous time active filters and CMOS-BiCMOS VLSI design. Nikos Fragoulis was born in Megara Attikis, Greece, in 1972. He received the B.S. degree in physics and the M.Sc. degree in electronics and Ph.D. in electronics from the Electronics Laboratory, Department of Physics, University of Patras, Patras, Greece, in 1995, 1998 and 2005 respectively. He is currently a post-doctoral researcher with the Electronics Laboratory, Department of Physics, University of Patras, Patras Greece. His research interests include, continuous time filtering, and analog integrated circuits for broadband telecommunication applications. Ioannis Haritantis received the Ph.D. in Electronics, in 1976, from the Physics Department, University of Patras, Patras, Greece, in collaboration with the Electrical Engineering Department, Imperial College, London, UK. For many years he has conducted scientific research on the development and design of circuits, discrete component and/or integrated, which are suitable for analog signal processing. His other fields of interest include, network theory, design and testing of integrated circuits, integrated active devices for telecommunications and medical instrumentation, smart sensors, and e-learning. During the past few years his focus is on the design of low-power, low-voltage, tunable, integrated active filters of high dynamic range that could operate at high frequencies. Professor Haritantis in now the director of the Electronics Laboratory, Division of Electronics and Computers, Department of Physics, University of Patras, Patras, Greece. He is also in the editorial board of the journal “Analog Integrated Circuits and Signal Processing”, Kluwer Academic Publishers.     

Realization of Voltage and Current Mode KHN Biquads Using CCCIIs

In this work, new Kerwin-Huelsman-Newcomb (KHN) biquads employing current-controlled current conveyors (CCCIIs) in voltage-mode (VM) as well as in current-mode (CM) are presented. The parameters of the proposed circuits can be electronically controlled thanks to the tunability properties of the CCCIIs. The VM circuit is derived from a previously reported one by modifying its summing circuit and replacing the current conveyor(CCIIs) and resistors at their x-input terminals with CCCIIs. On the other hand, the CM circuit is derived from the adjoint graph of the signal-flow graph corresponding to the classical KHN circuit. This circuit is a multi-input single-output CM universal filter, which offers all the main advantages of the CM circuits as well as those of the classical KHN circuit. In addition to the three basic filter responses, they also allow the realization of the notch and the all pass responses.     

Realization of Series and Parallel R-L and C-D Impedances Using Single Differential Voltage Current Conveyor

In this paper, realization of series and parallel R-L immitances using differential voltage current conveyor (DVCC) is presented. The proposed circuits enable actively simulation series and parallel R-L and (-R)-(-L) immitances. Applying RC:CR transformation to the proposed configurations, series and parallel C-D and (-C)-(-D) simulators can also be realized with the same topology. They employ single DVCC and at most three resistors and one capacitor. No component matching constraints are imposed for the realisations. The performance of the proposed immittance simulators is demonstrated on both a second-order voltage and second-order current-mode filters. PSPICE simulations are given to verify the theoretical analysis. An erratum to this article is available at .     

一种将OTA-C电路转换为CFA-RC电路的方法--替换法

本文介绍了一种直接将基于跨导－Ｃ的电路（ＯＴＡ－Ｃ电路）转换成基于电流反馈放大器ＣＦＡ的电路（ＣＦＡ－ＲＣ电路）的方法－替换法,给出了ＣＦＡ－ＲＣ电路的设计表格。设计实例和实验结果证明了这种转换方法的正确性。     

Realization of Multidimensional Digital Transfer Functions with Separable Numerator or Denominator Polynomials

In this paper a straightforward z-domain procedure for realizing multidimensional transfer functions with either numerator or denominator polynomial separable is presented. This procedure yields structures with minimum number of multipliers. It is shown that the number of delay elements can be reduced by selecting the optimum values for certain parameters. To facilitate this theorems that are applicable for some special cases are presented.     

Tunable Ladder-Type Realization of Current-Mode Elliptic Filters

It is shown that a new series FDNR-R equivalent circuit using current controlled current conveyors (CCCIIs) allows effective realization of jω-axis zeros which are known to complicate the active implementation of ladder-type elliptic filters. The resulting ladder-type elliptic filter employs all grounded capacitors while keeping the number of active elements small. Also, the filter parameters are electronically tunable, which is important from integration point of view.     

电流模电路的通用单元电路

提出了电流模电路中的一个通用积木块－伴随运放。用它能把基于电压运放的电压模电路转换成电流模电路。分析了理想伴随运放的特点和应用,提出一种ＣＭＯＳ伴随运放电路,介绍了用它设计的电流模滤波器。