一种基于MO-OTA-C的多功能电流模式滤波器

文中提出了一种由多端输出的运算跨道放大器(M0-OTA)及电容(C)构成的具有单端输入三端输出的多功能电流模式滤波器电路及MO-OTA的CMOS实现电路。该滤波器电路仅由1个三端输出的OTA、3个双端输出的OTA及2个接地电容(C)组成,能实现二阶低通、带通、高通、带阻及全通滤波器,其中二阶低通、带通、高通滤波器能同时实现。整个电路仅由MO-OTA及接地电容构成,而MO-OTA由CMOS器件构成,所以文中电路便于集成且与VLSI工艺兼容。文中还给出了电路的计算机PSPICE仿真结果。     

采用MCCII实现的三输入单输出二阶通用滤波器

本文提出了一种新的基于MCCII(Modified Second-generation Current Conveyors)电流模式的三输入单输出的二阶通用滤波电路。该电路能通过三输入端不同的输入信号组合，即可在输出端实现二阶低通、高通、带通、带阻、全通滤波功能。此电路仅使用了二个MCCII器件、三个接地电阻和二个接地电容，具有源器件数目最少、输出阻抗高、无源和有源灵敏度低、滤波器特性参数均可独立调节等特点，且电路所有电阻、电容均接地，适于集成。PSPICE仿真结果进一步证明了理论分析的正确性。     

一种用CFA实现的通用高阶滤波器

以信号流图为基础,用CFA设计了一种通用高阶滤波电路。这种电路结构由CFA和电阻、电容组成,具有通用性,只需调整接地阻抗的值,就能实现高阶低通、带通、高通及带阻几种不同的滤波功能。列举了四阶带通和五阶高通两种滤波器,并对两种滤波器进行了仿真,PSpice仿真结果与理论分析一致。     

新颖的基于CCⅡ—的二阶电流模式滤波器

提出了由单个第二代反相电流传输器及两个接地电容器、一个接地电阻和一个浮端电阻构成的二阶电流模式滤波器电路。该电路能同时实现低通、带通滤波功能，与同类电路比较，该电路结构更简单，接地元件较多，便于集成。     

基于CFA的二阶带通滤波器

本文提出了用两个电流反馈放大器（CFA）和几个电阻电容设计一个二阶带通滤波器。这种滤波器的特征角频率ω0和品质因数Q由接地电容调节，而且对有源和无源元件的灵敏度都低，并用PSPICE的仿真结果证明了理论分析。     

新的基于CCⅡ混合模式滤波器

本文提出一种新的基于CCⅡ混合模式滤波器电路,该电路仅由3个CCⅡ器件及几个接地RC元件构成,能实现二阶低通、带通、高通、带阻及全通混合模式滤波器,其中低通、带通及高通能同时实现,与同类电路比较,少用了一个 CCⅡ器件;各滤波器的所有RC元件均接地,更便于集成。文中给出了电路的实验结果。     

一种高输入阻抗单CCII电压模式滤波器

提出了一种实现高输入阻抗电压模式滤波器的新电路。该电路使用一个CCII(第二代电流传输器)和最少量的RC元件实现一阶低通、一阶高通及二阶带通滤波器。一阶滤波器仅含3个接地RC元件,二阶滤波器含4个RC元件,其中电容均接地。给出了电路的有源及无源灵敏度及计算机PSPICE仿真结果     

电流模式n阶CCCⅡ-C的多输入单输出滤波器设计

该文提出了一种结构简单的基于MCCCⅡ的n阶多输入单输出电流模式滤波器电路.该滤波器电路包含n个有源器件、n个接地电容元件,无需接任何电阻元件,可以产生n阶低通、带通、高通、带阻及全通电流模式滤波.由于仅依靠改变外部输入电流信号的接入数目和方式来实现不同功能的滤波器,而电路内部结构及器件数目不变,所以该电路便于单片集成.文中对滤波器进行了PSPICE模拟.     

电流模式n阶CCCII-C的多输入单输出滤波器设计

该文提出了一种结构简单的基于MCCCII的n阶多输入单输出电流模式滤波器电路。该滤波器电路包含n个有源器件、n个接地电容元件,无需接任何电阻元件,可以产生n阶低通、带通、高通、带阻及全通电流模式滤波。由于仅依靠改变外部输入电流信号的接入数目和方式来实现不同功能的滤波器,而电路内部结构及器件数目不变,所以该电路便于单片集成。文中对滤波器进行了PSPICE模拟。     

电流模式n阶CCCII-C的多输入单输出滤波器设计

该文提出了一种结构简单的基于MCCCII的n阶多输入单输出电流模式滤波器电路。该滤波器电路包含n个有源器件、n个接地电容元件,无需接任何电阻元件,可以产生n阶低通、带通、高通、带阻及全通电流模式滤波。由于仅依靠改变外部输入电流信号的接入数目和方式来实现不同功能的滤波器,而电路内部结构及器件数目不变,所以该电路便于单片集成。文中对滤波器进行了PSPICE模拟。     

Current-mode continuous-time filters using complementary current mirror pairs

A design of current-mode continuous-time filters for low voltage and high frequency applications using complementary bipolar current mirror pairs is presented. The proposed current-mode filters consist of simple bipolar current mirrors and capacitors and are quite suitable for monolithic integration. Since the filters are based on the integrator type of realization, the proposed method can be used for a wide range of applications. The frequency of the filters can easily be changed by the DC controlling current. A fifth-order Butterworth and a third-order leapfrog filter with tunable cutoff frequencies from 20 MHz to 100 MHz are designed as examples and simulated by SPICE using standard bipolar parameters.     

Inverse Ultraspherical Filters

The inverse ultraspherical filter is derived and its properties analyzed. It is shown that the inverse ultraspherical filter has smaller transition band than the inverse Chebyshev filter under certain circumstances while still maintaining the maximally flat passband characteristic. Filter pole and zero calculations are described and typical magnitude and delay responses generated. Nomographs of inverse ultraspherical filters are also provided for determining filter order and for possible magnitude response optimization.Celestino A. Corral was born in Havana, Cuba. He earned his Bachelors, Masters and Ph.D. degrees in electrical engineering from the University of Miami, Florida, in 1985, 1987, and 1993, respectively. He completed his Ph.D. program under a Patricia Roberts Harris fellowship. From 1988 to 1990 Dr. Corral was a Member of the Technical Staff at Sandia National Laboratories, Albuquerque, New Mexico, where he was involved in the analysis, modeling, and design of custom circuits for piezoelectric sensor components. In 1994, he joined Scientific-Atlanta in Atlanta, Georgia, as an Associate Staff RF Engineer and worked on communication systems and specialized microwave software. In 1997 he was Senior Design Engineer at Origin Data Systems in Boca Raton, Florida, where he had multiple roles in system, hardware, and software development for a novel asset management/RFID system. Currently, Dr. Corral is a Distinguished Member of the Technical Staff in Motorola Labs, Plantation, Florida, and is involved in ultra-wideband, wideband, and propagation research. His interests include circuit and filter theory, communication systems, numerical analysis, signal processing, and constrained optimization. He has published over twenty-five journal and conference papers, has six patents filed, and two trade secrets.Dr. Corral was principal recipient of the Myril B. Reed Best Paper Award for the 40th Midwest Symposium on Circuits and Systems in 1997. Dr. Corral is also the principal recipient of the Ambrose Fleming Premium for IEE Proceedings on Circuits, Devices, and Systems, 2000. Dr. Corral is a Senior Member of IEEE and a member of Omicron Delta Kappa, Tau Beta Pi, and Eta Kappa Nu honor societies.     

波导带通滤波器的精确设计和快速优化

介绍了采用三维微波电磁场仿真软件快速提取直接耦合波导带通滤波器耦合窗口参数的方法,并提出了优化最终模型的快速扫描技术.全波仿真及实验结果表明,该方法能满足波导带通滤波器快速精确设计的要求.     

Design of two-dimensional directional filters

A directional filter has a passband extending fully along a straight line passing through the origin. In its original form the transformation technique, a powerful tool for designing two-dimensional FIR filters, is not useful to design such a filter. In this communication we suggest a few analytical and optimisation-based methods to design directional filters using the transformation technique. The superiority of the proposed methods over existing techniques is demonstrated.     

一种基于CIC滤波器的有效锐化方法研究

介绍了对积分梳状滤波器（CIC滤波器）的有效锐化。所提出的锐化滤波器的结构由两个主要部分组成：一个梳状滤波器的级联部分和一个锐化滤波器部分。所提出的方案使得滤波器中锐化部分的工作速率比输入速率大为降低，其频谱响应特性比传统的也有所改进。通过MATLAB仿真，可看出改进锐化后的滤波器性能更优。     

Miniaturized dielectric waveguide filters

Design techniques for a new class of integrated monolithic high-permittivity ceramic waveguide filters are presented. These filters enable a size reduction of 50% compared to air-filled transverse electromagnetic filters with the same unloaded Q-factor. Designs for Chebyshev and asymmetric generalised Chebyshev filter and a diplexer are presented with experimental results for an 1800 MHz Chebyshev filter and a 1700 MHz generalised Chebyshev filter showing excellent agreement with theory.     

DDC中的抽取滤波器设计及FPGA实现

本文介绍了在数字下变频（DDC）中的抽取滤波器系统设计方法和具体实现方案。采用CIC滤波器、HB滤波器、FIR滤波器三级级联的方式来降低采样率。通过实际验证，证明了设计的可行性。     

一种数字下变频抽取滤波器的设计

对一个针对数字下变频应用的抽取滤波器从设计指标到版图实现的设计过程进行了详细介绍.该抽取滤波器实现了20倍的降采样,由CIC滤波器、CIC补偿滤波器和半带滤波器三级依次串联而成.通过利用抽取滤波器的等价变换和多项分解性质,各滤波器级的硬件电路开销和运行功耗都得到了降低.     

大功率谐波吸收式滤波器设计

介绍了大功率谐波吸收式滤波器的实现电路，这些电路满足了信号分流的技术要求。文中给出了详细的工作原理和测试数据。     

Single-stage line-coupled ac/dc converter with high power factor and ripple-free input current

Single-stage line-coupled ac/dc converter with high power factor and ripple-free input current is proposed. The proposed power factor correction circuit can achieve high power factor and ripple-free input current using a coupled inductor. Experimental results for a 400?W converter at a constant switching frequency of 100?kHz are obtained to show the performance of the proposed converter.