High Input Impedance Voltage-Mode Universal Biquadratic Filter with Three Inputs Using DDCCs

A new high input impedance voltage-mode universal biquadratic filter with three input terminals and five output terminals is presented. The proposed circuit uses three plus-type differential difference current conveyors, two grounded resistors and two grounded capacitors. The proposed circuit can realize all the standard filter functions: lowpass, bandpass, highpass, notch and allpass, without component matching conditions. The proposed circuit offers the features of high input impedance, low active and passive sensitivities and the use of only grounded resistors and capacitors.     

High Input Impedance Voltage-Mode Universal Biquadratic Filter with Three Inputs and Six Outputs Using Three DDCCs

A new high input impedance voltage-mode universal biquadratic filter with three input terminals and six output terminals is presented. The proposed circuit uses three plus-type differential difference current conveyors (DDCCs), three resistors, and two grounded capacitors. The proposed circuit can realize all the standard filter functions, namely, lowpass, bandpass, highpass, notch, and allpass, simultaneously, without component matching conditions. The proposed circuit still offers the features of high input impedance, using only grounded capacitors, and orthogonal controllability of resonance angular frequency and quality factor.     

新颖的电压模式通用双二阶滤波器

提出了采用第二代电流传送器构成的电压模式三输入、单输出多功能通用双二阶滤波电路,该电路通过选择不同的输入信号,可在输出端得到电压模式二阶低通、高通、带通、陷波和全通五种滤波功能。每种滤波功能的滤波器的固有角频率ωｐ和品质因素Ｑｐ可实现正交调节,所有滤波器都具有低的无源和有源灵敏度。     

High Input Impedance Voltage-Mode Universal Biquadratic Filter with One Input and Five Outputs Using Current Conveyors

A new high input impedance voltage-mode universal biquadratic filter with one input terminal and five output terminals is presented. The proposed circuit uses three differential voltage current conveyors (DVCCs), four resistors, and two grounded capacitors. The proposed circuit can realize all the standard filter functions—lowpass, bandpass, highpass, notch, and allpass—simultaneously, without changing the passive elements. The proposed circuit enjoys the features of high input impedance, orthogonal control of resonance angular frequency and quality factor, use of only grounded capacitors, and low active and passive sensitivities.     

Voltage-Mode Universal Biquadratic Filters with One Input and Five Outputs

Four new voltage-mode universal biquadratic filters each with one input terminal and five output terminals are presented. Each of the first two proposed circuits uses four plus-type second-generation current conveyors, two grounded capacitors and five resistors. The third proposed circuit employs two plus-type second-generation current conveyors, one differential voltage current conveyor, two grounded capacitors and five resistors. The fourth proposed circuit employs two multi-output second-generation current conveyors, two grounded capacitors and five resistors. Each of the proposed circuits can realize all the standard filter functions; highpass, bandpass, lowpass, notch and allpass, simultaneously, without changing the passive elements. The proposed circuits enjoy the features of orthogonal controllable of resonance angular frequencies and quality factors, using only grounded capacitors as well as low active and passive sensitivities. Jiun-Wei Horng was born in Tainan, Taiwan, Republic of China, in 1971. He received the B.S. degree in Electronic Engineering from Chung Yuan Christian University, Chung-Li, in 1993, and the Ph.D. degree from National Taiwan University, Taipei, in 1997. From 1997 to 1999, he served as a Second-Lieutenant in China Army Force. From 1999 to 2000, he joined CHROMA ATE INC. where he worked in the area of video pattern generator technologies. From 2000 to 2005, he joined the Department of Electronic Engineering, Chung Yuan Christian University, Chung-Li, Taiwan as an Assistant Professor. Since 2005, he is an Associate Professor. His teaching and research interests are in the areas of Circuits and Systems, Analog and Digital Electronics, Active Filter Design and Current-Mode Signal Processing. Chun-Li Hou was born in Taipei, Taiwan, Republic of China, in 1951. He received the B.S. degree, M.S. degree, and Ph.D. degree in Electrical Engineering from National Taiwan University, Taipei, in 1974, 1976, and 1991, respectively. From 1977 to 1979, he taught as a lecture in Tamkang College. From 1981 to 1991, he taught as a lecture in the department of Electronic Engineering, Chung-Yuan Christian University, Chung, Taiwan. From 1992 until now, he taught there as an Associate Professor. His teaching and research interests are in the areas of Current-Mode Analog Circuit Analysis and Design, Active Network Synthesis Circuit theory and Applications. Chun-Ming Chang obtained his bachelor and master degrees, both in the field of electrical engineering, from National Cheng Kung University, Tainan, Taiwan, R.O. China, and his Ph.D. degree in the field of electronics and computer science from the University of Southampton, U.K. He had been an associate professor in Chung Yuan Christian University in Taiwan from 1985 to 1991, and has been a full professor in the same University since 1991. His research interest is divided by two relative fields, network synthesis before 1991 and analog circuit design after 1991. He had been a chairman of the electrical engineering department in Chung Yuan Christian University from 1995 to 1999. Recently, he was recommended for inclusion in The Contemporary Who's Who of Professionals 2004 Edition, and nominated by the Governing Board of Editors of the American Biographical Institute for the prestigious title MAN OF THE YEAR-2005, and became an Advisor of the ABI's distinguished RESEARCH BOARD OF ADVISORS due to the invention of Analytical Synthesis Method and OTA-Only-Without-C Circuits in the field of analog circuit design. Wen-Yaw Chung was born in Hsin-Chu, Taiwan, R.O.C., 1957. He received the B.S.E.E. and M.S. degrees from Chung Yuan Christian University, Chung Li, Taiwan, in 1979 and 1981 respectively, and the Ph.D. degree in Electrical and Computer Engineering from Mississippi State University, USA, in 1989. Subsequently, he joined the Advanced Microelectronics Division, Institute for Technology Development in Mississippi, where he was involved in the design of a bipolar optical data receiver. In 1990 he worked as a design manager for the Communication Product Division, United Microelectronics Corporation, Hsin-Chu, where he was involved in the design of analog CMOS data communication integrated circuits. Since 1991 he has been an Associate Professor in the Department of Electronic Engineering at Chung Yuan Christian University. His research interests include mixed-signal VLSI design, biomedical IC applications, sensor and actuator interfacing for deep submicron VLSI electronics.     

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。     

Voltage-Mode New Universal Biquad Filter Configuration Using a Single VDIBA

A universal voltage-mode filter configuration employing a voltage differencing inverting buffered amplifier (VDIBA), two capacitors and a resistor is proposed. The presented structure can realize all the five standard biquadratic filters: low-pass, high-pass, band-pass, band-reject and all-pass, without changing the circuit topology. The proposed filter circuit also provides the following advantageous features, not available simultaneously in any of the single active element/device based universal biquad realizing all the five filter responses known earlier so far: (i) independent electronic tuning of natural angular frequency (ω ₀) and bandwidth (BW), (ii) no requirement of any element matching condition or inversion of input signal(s) (as needed in most of the earlier reported structures), and (iii) low active and passive sensitivities. Moreover, even the internal structure of the new building block is possibly the simplest among all recently introduced new building blocks. The workability of the proposed filter has been confirmed by SPICE simulations using 0.18 μm technology.     

Single FDCCII-Based Tunable Universal Voltage-Mode Filter

None of the previously reported voltage-mode universal biquad filters with three inputs and a single output offers either of the following two important advantages: (i) the use of only one active element and (ii) independent control of ω₀ and ω₀/Q. In this paper, a novel biquad filter, achieving both of these advantages, is presented. HSPICE simulation results using TSMC025 process and ±1.25 V supply voltages validate the theoretical predictions.     

Electronically Tunable Single-Input Five-Output Voltage-Mode Universal Filter Using VDTAs and Grounded Passive Elements

This paper presents a possible usage of the voltage differencing transconductance amplifier (VDTA) for the design of an electronically tunable single-input five-output voltage-mode universal filter. The presented filter is constructed using two VDTAs, two capacitors and two resistors that are all grounded. The circuit simultaneously realizes lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP) filtering responses, without changing the circuit topology. The circuit is capable of providing an independent electronic control of the natural angular frequency (ω ₀) and the quality factor (Q) through the transconductance gains of the VDTAs. By simply adjusting the transconductance ratio, a high-Q filter can also be obtained. Because of the high-input impedance of the circuit, it is advantageous for cascade connection. To support the theoretical analysis, the properties of the designed filter have been verified by PSPICE simulation results.     

一种新颖的电压模式通用二阶CFA滤波器设计

提出了一种仅用2个电流反馈放大器(CFA)实现的三输入单输出电压模式通用二阶滤波器电路。该电路由2个电流反馈放大器(CFA)、2个电容、3个电阻构成,他能实现二阶低通、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。     

一种基于电流反馈放大器的新的通用滤波器

本文介绍了电流反馈放大器（CFA）的基本原理,用四个CFA和几个电阻、电容设计了一种三输入单输出的新的通用滤波器。这种滤波器在无需电阻电容匹配的情况下,能实现二阶的低通、带通、高通、带阻以及全通五种滤波功能。每种滤波功能的特征角频率ω0都能由接地电容调节,而品质因数Q可由接地电阻单独调节。该滤波器对有源和无源元件的灵敏度都不超过1。利用PSPICE软件对电路图进行了仿真,仿真结果与理论分析一致。     

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。     

调制解调式双二次型滤波器

提出了一种调制解调式双二次（托氏电路）滤波器，它可直接对以方波为载波的基带信号（方波的幅度信号）进行带通滤波、低通滤波处理。尤其，作为基带信号的带通滤波可在载波频率上实现级联运用。     

Universal voltage-mode filter using only plus-type DDCCs

Despite the extensive literature on current conveyor-based voltage-mode universal biquads with single input and multiple outputs, no filter circuit has been reported to simultaneously achieve all of the advantageous features: (i) employment of only two differential difference current conveyor (DDCC), (ii) employment only two grounded capacitors, (iii) employment only three resistors, (iv) simultaneously realize voltage-mode low-pass, band-pass, high-pass, notch and all-pass filter signals from the five output terminals, respectively, (v) orthogonal control of ω _o and Q, (vi) low input impedance and can be cascadable (vii) no need to employ inverting type input signals, and (viii) no need to impose component choice except realizing the all-pass filter signal.     

一种新的开关电流双二次滤波器

本文阐述了开关电流(SI)和开关电容(SC)电路的相似性原理,由此提出了一个新的SI双二次滤波器电路,该电路是由文献[5]的三运放SC双二次电路为原型导出的。该电路的一个重要特征是:它在单一积木块上能同时获得低通、带通和高通滤波功能。据此,得到了SI电路的一般双二次实现。     

All-Grounded Passive Elements Voltage-Mode DVCC-Based Universal Filters

In this paper two new voltage-mode (VM) universal filters employing three plus-type differential voltage current conveyors (DVCC+s) and grounded passive elements are presented. The first proposed filter is a single-input five-output (SIFO) circuit which can realize simultaneously all of the standard responses, i.e. low-pass (LP), band-pass (BP), high-pass (HP), all-pass (AP) and notch (NH) from the same configuration. The second proposed circuit is a three-input single-output (TISO) universal filter for realizing standard responses depending on the selection of the input signal from the same topology. Both of the proposed filters have the advantage of a high input impedance, which enables easy cascading to obtain higher order filters. The proposed filters are simulated using the SPICE program to verify the theoretical analysis.     

基于改进型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流传送器，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ＣＣＩ±和五个无源元件构成，可以实现二阶低通、高通、带通带阻和全通滤波功能，且可以多端输出，电路中电阻电容全部接地，适于全集成。中心频率和品质因数的无源灵敏度很低，面向实际电路完成ＭＯＳ管级的ＰＳＰＩＣＥ仿真，结果表明所提出的电路方案是可行的。     

用MAX264设计通用有源滤波器

用MAX264设计基于软件无线电思想的可编程控制的滤波电路。     

连续时间电压型CCⅡ+/-双二阶滤波器

本文提出了一种新颖的连续时间电压模式ＣＣＩＩ＋／－双阶滤波通用电路,通过选择合适的输入电压,它可以实现二阶低通、高通、带通、带阻和全通滤波功能。该电路零、极点参数独立可调,ＰＳＰＩＣＥ仿真结果与理论分析相吻合。     

基于阶梯阻抗的发夹结构低通滤波器设计

提出一种基于阶梯阻抗发夹谐振器的小型化微波低通滤波嚣,该滤波嚣仅由包含四节微带的阶梯阻抗发夹谐振器构成.设计结果表明,滤波器3dB通带从直流到2.8G,带内反射小于-20dB,带外抑制达到40dB.这种滤波器尺寸小,易制造,且具有陡峭的截止频率响应特性,可用于许多微波系统中.