A Novel Grounded Inductor Realization Using a Minimum Number of Active and Passive Components

In this study, we present a new topology for realizing a grounded inductor employing only a single current conveyor, called a negative‐type modified inverting second‐generation current conveyor (MICCII‐), and a minimum number of passive components, two resistors, and one capacitor. The non‐ideality effects of the MICCII‐on a simulated inductor are investigated. To demonstrate the performance of the presented inductance simulator, we use it to construct a third order Butterworth high‐pass filter and a parallel resonant circuit. Simulation results are given to confirm the theoretical analysis.     

Novel Transimpedance Type First-Order All-Pass Filter Using Single Otra

A novel transimpedance-mode first-order all-pass filter configuration is proposed. It uses a single operational transresistance amplifier (OTRA) and few passive components. The proposed circuit is structurally all-pass that does not impose any component matching condition. The proposed circuit is insensitive to parasitic input capacitances and input resistances due to the internally grounded input terminals of the OTRA. It provides an alternative realization of phase equalizers for analog signal processing applications by providing also current-to-voltage conversion. The theoretical results are verified with PSPICE simulations using a CMOS realization of OTRA.     

基于单个CCCCTA接地回转器的系统综合

为综合基于CCCCTA的接地回转器,根据CCCCTA的零-镜模型和接地回转器的节点导纳矩阵,利用节点导纳矩阵扩展法,我们实现了4个相互等效的接地回转器。导出的回转器具有两个特点,一个是通过调节CCCCTA的偏置电流,可以电控调节回转器的参数; 另一个特点是电路仅使用单个CCCCTA。作为一个例子,通过使用导出的回转器之一,我们实现了一个极点频率为1.274MHz、品质因素为4的带通滤波器。计算机仿真证明所导出的电路正确有效。     

ICCII-Based Voltage-Mode Filter with Single Input and Six Outputs Employing Grounded Capacitors

In this paper, a novel second-order voltage-mode filter with single input and six outputs employing inverting second-generation current conveyors (ICCIIs) is presented. This filter simultaneously realizes negative and positive gain lowpass, bandpass, and highpass filter responses, and does not require active and passive element matching. The new filter has low active and passive element sensitivities, and offers orthogonal control of the angular resonance frequency (ω_o) and quality factor (Q).     

新型微波有源滤波器综合方法

本文给出了一种新颖的微波有源滤波器的拓扑结构及综合方法，并对有源滤波电路进行了计算机模拟，结果表明本文给出的微波有源滤波器电路具有优良的的窄带滤波特性，通带内正向增益大于１０ｄＢ，带外抑制大于３０ｄＢ。     

一种采用NSPUDT结构的新型滤波器

利用自然单相单向换能器,可以制作低损耗的声表面波器件。因自然单相单向换能器基片的单向性依赖于晶体的取向,用常规的单指结构就可以获得单向性。为了得到低损耗的滤波器,在相对方向上的接受换能器也设计成单向传输。文中介绍了一种使自然单相单向换能器基片单向性反向传输的新型滤波器结构,并给出采用这种结构设计制作 的声表面波滤波器的结果。     

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.     

A Novel Quasi-Elliptic HTS Filter With Group-Delay Equalization Using Compact Quasi-Lumped Element Resonators in VHF Band

To produce a filter small enough to fit a 2-in wafer in the very high frequency (VHF) band while avoiding parasitic cross coupling among nonadjacent resonators, a novel quasi-lumped element resonator with interdigital capacitor, double-spiral inductor, and pad capacitor have been introduced. This resonator has not only a highly miniature structure but also a very weak far-field radiation. A ten-pole quasi-elliptic filter with group-delay equalization, which has a 7.1-MHz 1-dB passband and a center frequency of 257.5 MHz, is designed and fabricated on a 37.3 x mm x 30.1 x mm x 0.5 x mm LaAlO₃ substrate. The measured results showed a 0.24-dB insertion loss, a 15-dB return loss, and a 70-dB out-of-band rejection. Moreover, the group delay variation is less than 50 ns over 70% of the 1-dB passband and the band where the phase error ripple is within plusmn5^deg is more than 80% of the 1-dB passband. The overall experimental performance showed excellent agreement with the theory and simulation, which is a good proof of the advantage of our weak far-field radiation resonator. The result showed that the novel resonator is very suitable to fabricate narrowband ultrahigh frequency, VHF, or even lower frequency high-temperature superconductor filters on a 2-in wafer.     

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。     

SIR实现的新型毫米波UWB滤波器

提出了一个用阶跃阻抗谐振器(SIR)实现的毫米波超宽带(UWB)滤波器。滤波器的基本单元是一个由半波长微带线谐振器和SIR组成的三模谐振器。该谐振器采用SIR结构,从而达到阻带宽、结构紧凑,且能很好地改善带外抑制。为了进一步改善阻带特性,该三模谐振器与半波长谐振器平行耦合形成新型的滤波器。该滤波器有多个传输极点和传输零点,形成陡峭的通带边缘特性和很宽的阻带。实验测得滤波器的-3 dB相对带宽为35.7%,通带内的插入损耗约为-1.7 dB。插入损耗低于-17 dB的高频端阻带可到76 GHz。滤波器的仿真结果和测试结果基本吻合。     

Second Order Band-Pass Filter Design Using Single CC-CDBA

Six new second order band-pass filter configurations using only a single current-controlled current differencing buffered amplifier (CC-CDBA) are proposed. Further, the proposed filters also have a minimum number of external electronic components. They realize current-mode, voltage-mode and transadmittance-mode filter characteristics. The quality factor and natural frequency can be adjusted electronically without changing the values of the passive components. The proposed filters use a minimum number of passive elements (two or three). There is no second order active filter structure which uses two passive components and one active component in the literature. The validity of the proposed filters is verified through PSpice simulations.     

单片有源滤波器LTC1562的原理与应用

LTC1562是美国LinearTechnologyCorp 推出的连续时间单片有源RC滤波器集成器 ,它不需要外部时钟信号。通过该芯片和凌特公司的FilterCAD软件可以方便的设计出各种不同类型的滤波器。文中介绍了LTC1562内部结构、特点 ,给出了利用FliterCAD软件设计的一个八阶切比雪夫有源带通滤波器的的应用电路     

Realization of Universal Active Complex Filter Using CCIIs and CFCCIIs

In this paper, two universal building blocks for complex filter using CCIIs, CFCCIIs, grounded resistors and grounded capacitors are presented. These can be used to realize various complex bandpass filters with arbitrary order. The paper shows that the response error of the proposed circuit caused by nonideality of active components is more easily compensated than that of the conventional one employing op-amps, and that the sensitivities for all components are relatively small. Experimental results are used for verifying the validity of the proposed circuits.     

单端反激有源钳位和同步整流技术研究

有源钳位技术通常只在正激DC/DC功率电源拓扑结构中。现介绍有源钳位和同步整流技术在反激拓扑结构中的应用及研究。通过有源钳位和同步整流应用到反激式拓扑中的原理设计技术,以及厚膜和模块立体混装技术,以达到电源高效率和高功率密度的目的。通过5 V/20 W电源样品设计和组装以及模拟试验,电源样品功率密度达50.8 W/inch3,效率为89.2%,纹波为43 m V。试验样品证明反激式有源钳位和同步整流技术是提高中小功率隔离电源功率密度的最有效技术途径。     

一种新型并联混合有源滤波器的研究

本文提出了一种新型并联混合型有源滤波器的拓扑，新型拓扑通并联谐 振抑制流过无源网络的基波无功电流，减小了有源滤波器承担的基波电流。同时在此拓扑基础上讨论了它的控制策略，在此控制策略下，有源滤波器不承担基波电矿井，且只承担很小的基波电流，因此有源滤波器的容量达到了最小，本文分析了并联谐振对无源网络阻抗的影响，并对此分析了控制策略在传统拓扑和新型拓扑下对有源滤波器容量的影响，最后通过仿真证明了结论的正确性。     

高密度封装进展之五——采用无源元件和有源元件埋入技术实现的模块内系统封装

介绍了将无源元件和有源元件埋置于基板内部的三维封装模块SIMPACT。其利用热固性树脂和无机填料构成的复合材料,在不造成元件损伤的前提下,能在多层基板的任意层内三维埋入元件,由此构成一个封装内具有系统功能的小型模块。     

一种基于CMOS工艺射频有源滤波器的设计

射频滤波器是无线通信系统的关键部件之一。本文根据射频SoC的需求,设计了一种基于Q-增强型射频有源CMOSLC型滤波器。该滤波器利用负阻抗增强电路品质因数,可有效地解决射频片上无源LC滤波器的品质因数偏低,插入损耗偏大的问题。该滤波器采用TSMC 0．18umCMOS工艺,当供电电压为1．8V,中心频率在2．142GHz时,-3dB带宽仅为36MHz。仿真结果表明,该滤波器正确有效,适于全集成。     

Active RC Filter Building Blocks Using Frequency Emphasizing Networks

The development of economic hybrid integrated filter building blocks is reported on. The units are versatile and can be utilized for a wide variety of applications. They are based on a metliod of network synthesis that generates general second-order networks by pole-zero cancellation of passive RC and active all-purpose frequency emphasizing networks.     

A Versatile Universal Capacitor‐Grounded Voltage‐Mode Filter Using DVCCs

In this paper, a versatile three‐input five‐output universal capacitor‐grounded voltage‐mode filter is proposed. The circuit employs two differential voltage current conveyors as active elements together with two grounded capacitors and four resistors as passive elements. The proposed configuration can be used as either a single‐input five‐output or three‐input two‐output. Unlike the previously reported works, it can simultaneously realize five different generic filtering signals: lowpass, bandpass, highpass, bandreject, and allpass. It still maintains the following advantages: (i) the employment of all grounded capacitors, (ii) no need to employ inverting‐type input signals, (iii) no need to impose component choice, (iv) orthogonal control of the resonance angular frequency ω_o and the quality factor Q, and (v) low active and passive sensitivity performances.