用电流传输器CC实现RC滤波器

提出了采用电流传输器作有源器件实现RC滤波器，其电路结构简单，使用元件数目少，输入阻抗高，电路级联无需阻抗匹配。     

一种有源RC复数滤波器的设计方法

提出了一种采用有源RC滤波器实现复数滤波器时可快速确定无源器件参数值的设计方法.设计了一款中心频率为2MHz,带宽为2.4MHz的有源RC复数滤波器,并对自动频率调谐系统进行了分析.     

用电流传输器CC实现RC滤波器

提出了采用电流传输器作有源器件实现RC滤波器,其电路结构简单,使用元件数目少,输入阻抗高,电路级联无需阻抗匹配。     

有源RC滤波器网络的综合

无源LC梯形网络的综合已经形成了一套完美的理论和方法.而对有源RC网络的综合却研究的不多.文中基于节点导纳矩阵主元扩展理论,用给定的符号电压传递函数,给出了两个新的低通和带通二阶有源RC滤波器电路的综合方法.电路的仿真结果验证了有源网络综合理论在滤波器设计中的可行性.     

基于二阶滤波器的高阶带通滤波器设计和仿真

根据n阶带通滤波器传递函数的特点和低通与高通级联的思想,给出了高阶RC有源带宽可调的带通滤波器的一般设计方法和VCVS结构电路的设计步骤,并成功设计出一款高性能的四阶有源带通滤波器,其电路简单,通频带宽,精度高,成本低廉.经Multisim10仿真测试,其性能完全达到了预期效果和设计要求.     

N阶有源滤波器的散射参数综合法

讨论了用散射参数设计滤波器的优点，根据用散射参数表达的串联阻抗Z和并联导纳Y的二端口特性，给出了它们的有源RC电路模型，设计了一个用OPA和RC元件组成的N阶滤波器电路，不必改变电路参数，能同时实现高通和和低通滤波功能，本设计方法具有一定的理论和实践意义。     

基于第三代电流传输器的有源滤波器的导出

阐述了由电压模式有源RC滤波器导出基于电流传输器(CCIII)的电流模式连续时间滤波器的方法.即由运算放大器(OA)滤波器导出CC滤波器;导出的电流模式2阶滤波器结构简单,能实现2阶低通、高通、带通滤波,不仅所有无源和有源灵敏度都很低,而且当无源参数确定后,有源参数对极点频率W0不产生影响,W0保持恒定.HSPICE仿真表明,提出的电路是可行的.     

一种高阶电流模式滤波器的系统设计方法

提出了一种通用高阶电流模式滤波器系统综合设计理论和方法,该方法将高阶通用电流模式滤波器的传递函数分解为n个无损积分器级联的形式.文章给出了基于MOCCCII实现的高阶通用电流模式滤波器,电路结构简单,仅由n 1个有源器件和接地电容构成.通过改变输入电流的接入方式和接入数目就可以实现不同类型的滤波功能.面向实际电路完成Pspice仿真.     

基于第三代电流传输器的电流模式有源滤波器

提出了由电压模式有源RC滤波器导出基于第三代电流传输器的电流模式滤波器的方法.所得的电流模式二阶滤波器结构简单,能实现二阶低通,高通,带通滤波,不仅所有无源和有源灵敏度都很低,而且当无源参数确定后,有源参数对极点频率不产生影响,保持恒定.HSPICE仿真表明,所提出的电路是可行的.     

频率特性测量与作图技巧

以RC有源滤波器电路为例,利用示波器来讨论表征电路频率响应特性的波特图的作图方法,研究简明,直观的图形法来阐述RC有泺滤波器的电路特性以及电路的优化设计方法。     

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.     

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.     

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。     

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.     

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。     

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.     

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。     

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.     

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.