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。     

新颖的电压模式一阶低通—高通滤波器

本文提出了用第二代电流传送器（ＣＣＩＩ－）实现的电压模式一阶低通－高通滤波电路、计算机仿真结果表明了此电路的可行性和正确性。     

新颖的MOCCII的电流模式滤波器

文章根据四种典型的信号流图提出了相应的四种新颖的基于 ＭＯＣＣＩＩ（ 多端输出的ＣＣＩＩ） 的电流模式滤波器电路及 ＭＯＣＣＩＩ 的ＣＭＯＳ实现电路。这四种滤波器电路均能同时实现二阶低通、带通滤波器。文中各电路仅含两个ＭＯＣＣＩＩ器件,比较诸文献的多功能电流模式ＣＣＩＩ 滤波器,所用的ＣＣＩＩ 器件数要少。由于ＭＯＣＣＩＩ由ＣＭＯＳ器件实现,电路中所有ＲＣ 元件均接地,所以文中各电路便于集成且与ＶＬＳＩ工艺兼容     

基于改进剂CCII的电流模式多功能二阶滤波器

本文给出了一种结构简单性能优良的改进型电气传送器，并提出了由该电流传送器实现的电流模式多功能双二阶滤波器，该滤波器由三个ＣＣＩＩ±和五个无源元件构成，可以实现二阶低通，高通，带通变阻和全通滤波功能，且可以多端输出，电路中电阻电容器全部接地，适于全集成，中心频率和品质因九的无源灵敏度很低，面向实际电路完成ＭＯＳ管级的ＰＳＰＩＣＥ仿真，结果表明所提出了电路方案是可行的。     

电流模式全极点跳耦结构滤波器

本文给出了电流模式ＣＣＩＩ基本电路模块，讨论了用基本模块实现跳耦ＣＣＩＩ滤波器的电路结构和设计方法，该电路具有低灵敏度特性，适于实现全集成连续时间滤波器。     

基于多输出端差动差分电流传送器跳耦结构滤波器

提出了一种新颖的多输出端差动差分电流传送器（ＭＤＤＣＣ）及其ＣＭＯＳ实现电路,用计算机模拟比较了ＭＤＤＣＣ和第二代电流传送器（ＣＣⅡ）的特性;以ＭＤＤＣＣ构成了全差分式连续时间电流模式跳耦结构低通滤波器,分析并模拟了所提出的滤波器的特性,仿真结果表明所提出的电路方案正确有效;ＭＤＤＣＣ电路兼有差动放大器（ＤＤＡ）和ＣＣⅡ两者的优点,适于实现全集成连续时间滤波器。     

基于MOCCs的电流模式滤波器

本文提出了一种多输出电流传送器（ＭＯＣＣＳ）的改进ＣＭＯＳ实现，并以此对无源ＲＬＣ梯形网络进行模拟，获得一种新的电流模式滤波器结构，它们比用ＣＣⅡＳ实现的同类型滤波器节省一半有源器件。此外，还分析了ＭＯＣＣＳ的高频非理想特性及补偿方法，最后给出了截频为１ＭＨｚ、０．５ｄＢ波纹的五阶全极点低通滤波器和截频为２．４ＭＨｚ、０．１７３ｄＢ波纹的三阶椭圆滤波器实例，并经１．２μｍＣＭＯＳ工艺参数仿真证实     

一种新颖的CMOS差动电压电流传送器及其应用

针对第二代电流传送器（ＣＣⅡ）的不足之处，提出了一种新颖的差动电压输入电流传送器（ＤＶＣＣ）。首先给出了ＤＶＣＣ的ＣＭＯＳ集成工艺实现方法，并分析了其工作原理。然后给出其具体应用实全儿ＰＳＰＩＣＥ的模拟结果，验证了实现和应用ＤＶＣＣ的可行性。     

基于E型频变负阻的五阶椭圆高通滤波器设计

用电流传送器实现的E型频变负阻、接地电感和浮地电感作为单元电路,提出了实现高阶椭圆高通滤波器的设计方法.用该方法设计的有源滤波电路具有无源梯形网络原型的低灵敏度特性,给出了五阶椭圆高通滤波器的设计例子和PSPICE仿真结果.     

一种新颖的电压模式通用二阶CCII滤波器设计

提出了一种基于电流传送器的电压模式通用二阶滤波器电路。该电路由三个电流传送器（CCII＋／-）、两个电容、三个电阻构成，它能实现二阶低通、带通、高通、陷波、全通滤波函数。分析了该电路的电压传输函数及电路参数，并用PSPICE对该电路进行了仿真，仿真结果表明，该电路设计正确，电路结构简单，所用元器件少。     

Table-based linear transformation filters using OTA-C techniques

Linear transformation (LT) active filters using operational transconductance amplifiers (OTAs) and capacitors are presented. Based on the LT, two simple and systematic design tables are given to realise OTA-C filters efficiently. Using the proposed design tables, the synthesised all-pole and elliptic filters employ minimum numbers of OTAs and only grounded capacitors. As an example, a new third-order elliptic lowpass filter is realised. Experimental results are obtained to verify the theoretical analysis     

Systematic Generation of Current-Mode Linear Transformation Filters Based on Multiple Output CCIIs

A transformation called current-mode linear transformation (CMLT) and its filter applications using multiple output second-generation current conveyors (MOCCIIs) are presented. The systematic method is developed to realize CMLT MOCCII-based filters efficiently. Based on the proposed design tables, we can synthesize high-order current-mode all-pole and elliptic filters with MOCCIIs, grounded resistors and capacitors. Moreover, the high-frequency elliptic filter can also be efficiently realized by adding capacitors to the relative all-pole filter, although floating capacitors are needed. Third-order Chebychev and elliptic lowpass filters are described in this paper. Experimental results that confirm the theoretical analysis are obtained. Furthermore, the proposed circuits can be extended to higher-order filters.     

Wideband High-Selectivity Diplexers Utilizing Digital Elliptic Filters

Design techniques and element value tables are presented for the construction of compact high-selectivity diplexers using digital elliptic component filters. A brief review of an applicable diplexer theory is given and the derivation and use of the element value tables are discussed. The tables provide values for component filters with an even number of branches n for n=4 through n=12 with a prototype ripple value corresponding to maximum diplexer input VSWR of approximately 1.26 to 1. For n=8, 10, and 12 branch filters, additional tables with permuted transmission zero orders are given. Test results for an n=6 branch experimental diplexer of 2.25 to 1 bandwidth are presented. The design and construction of this diplexer is described in detail and serves to illustrate the use of the element value tables and design procedures presented. Many practical construction and alignment suggestions are given which are useful in obtaining designs with good response characteristics. The experimental diplexer has crossover frequencies at 1.5 and 3.4 GHz and provides greater than a 50 dB isolation at frequencies 0.2 GHz from crossover. The diplexer has an input VSWR 相似文献   

Computer subroutine for the third-order elliptic filter response

It is a tradition to design an elliptic (Cauer) filter using tables for the filter coefficients. Such tables may be generated using elliptic integrals, but they are limited. This note deals with a new computer subroutine which calculates the filter coefficients needed in elliptic filter design.     

Synthesis of Distributed Elliptic-Function Filters from Lumped-Constant Prototypes

A synthesis procedure for distributed elliptic-function filters utilizing published tables of lumped-constant elliptic-function filters has been devised. It is dependent upon the application of a new generalized transformation for distributed networks. The filters often require the realization of distributed Brune sections, and several novel practical realizations are given both for general and degenerate Brune (i.e., Foster) sections. Examples are given of elliptic function stop band and pass band filters having both wide and narrow bandwidths, and experimental results show good agreement with theory.     

Singlets, cascaded singlets, and the nonresonating node model for advanced modular design of elliptic filters

The singlet, which contains one resonator and generates one transmission zero, is introduced as the most basic building block for modular design of elliptic filters. Higher-order elliptic filters are designed by cascading singlets to generate the required transmission zeros. A novel model, the nonresonating node model (NRNM), which contains both resonating and nonresonating nodes is then introduced. The model allows a high level of modularity in the design of elliptic filters. Example filters are designed and measured to validate the model and the design approach.     

NOVEL LINEAR TRANSFORMATION SWITCHED-CAPACITOR FILTER DESIGN

This paper presents a novel method that is applied to realize the Linear Transformation(LT)Switched-Capacitor Filter(SCF).It adopts the Voltage Control Voltage Source(VCVS)equalized transfor-mation to revise the original LC ladder filter and induce it into 16 basic sections and then extend the princi-ple of the LT in order to fit active and 3 port networks and give out switched-capacitor circuits corre-sponding to the 16 basic sections,which can realize all four kinds of filters——LP,HP,BP,BS filters.De-signed examples are given here.An Nth order filter only requires N amplifiers and the circuit is insensitive toparasitic capacitances.The experimental results of a 3rd order elliptic LP and a 6th order elliptic BP are giv-en and agree with the theory.     

Sinh-Domain linear transformation filters

A new systematic method for designing Sinh-Domain linear transformation (LT) filters is introduced in this article. For this purpose, a substitution scheme containing the Sinh-Domain LT equivalent of each passive prototype has been introduced. The proposed equivalents have been realised by employing appropriate Sinh-Domain building blocks with low-voltage operation capability. As an example, a third-order Sinh-Domain elliptic LT filter has been designed and its performance has been evaluated through simulation results. In addition, a detailed comparison with the corresponding Sinh-Domain and log-domain counterparts has been performed and the obtained results have been further discussed.     

Waveguide Bandstop Elliptic Function Filters

Using the "natural prototype" for elliptic function filters, a design procedure is presented for a class of waveguide bandstop filters, which exhibit equiripple passband and stopband responses. Due to the availability of explicit formulas for element values in the natural prototype elliptic function filter, the design procedure is entirely analytic and does not require numerical synthesis techniques. The resulting physical structure is the familiar uniform guide with iris-coupled series stubs. Unlike the bandstop filters designed from maximally flat or Chebyshev prototypes, the elliptic function design results in stubs that are not exactly three-quarter-wave coupled.     

Design tables for partial-response data transmission filters

Practical design tables are presented for partial-response class 1 data transmission filters. These tables give the pole and zero locations and the main sample point of several filters. This information can be used to analyse the performance of the filters, both in the time domain and frequency domain, thus assisting the user in the choice of a filter to meet the requirements. The filters given in the tables can be syntheised in either active or passive form.