基于单个VDTA浮地回转器的系统综合法

为了得到单个VDTA浮地回转器,首先给出了VDTA的16个奇异模型,再根据节点导纳矩阵扩展法,系统综合了基于电压差分跨导放大器（VDTA）的浮地回转器,该回转器使用1个VDTA和一个接地电容,而且容易集成。通过调节的VDTA偏置电流,电路的参数能电控调节。最后,为了证实导出电路的可实现性,利用回转器构造了一个二阶通用滤波器,其极点频率fo=159 kHz,品质因数Q=1。MULTISIM仿真结果与理论一致。     

基于二端口串联的回转器设计与实现

本文提出了基于二端口串联的设计方法,采用运放所构成的回转器实现电路仅包含两个运放,是一种较为简单的实现电路。将回转器的开路电阻矩阵分解为两个子开路电阻矩阵之和,选择T型电阻电路作为其中一个子开路电阻矩阵的实现电路,进而设计出另一个子开路电阻矩阵的实现电路。电路利用运放设计负电阻和受控源以满足电路要求。Multisim仿真结果验证了设计电路的正确性和有效性。所述回转器设计与实现方法对电路理论的教学具有一定的启发与助益。     

基于二端口级联的回转器设计与实现

本文基于教学实践,提出一种基于二端口级联的回转器设计方法,并采用运放加以实现。将回转器的传输参数矩阵分解两个子传输传输矩阵之积,然后讨论两个子传输传输矩阵的实现电路,再将这两个实现电路级连,得到回转器的实现电路。使用运算放大器实现电路中的负电阻与受控源,并以Multisim仿真验证该方法的正确性。所述回转器设计与实现方法对电路理论的教学具有一定的启发与助益。     

多端口网络驱动点导纳矩阵函数的综合

本文提出了用（p + q）端口回转器综合多端口网络驱动点导纳矩阵函数,将多端口网络驱动点导纳矩阵函数Y(s)分解成G·Y_b(s)·G~T的形式,并且给出了求矩阵函数Yb(s)和矩阵G的方法。给出了Y（s）= G·Y_b(s)·G~T的综合电路。     

基于CCCⅡ的系列电路

本文提出了一系列基于CCCⅡ(电流控制第二代电流传输器)的电路:接地与浮地回转器、频变负阻器及电容乘法器,这些电路的参数均可通过各CCCⅡ的外接电流进行调节.所提出的系列电路在电路与系统的设计中有着重要的应用价值.     

基于CCCII的系列电路

本文提出了一系列基于CCCII（电流控制第二代电流传输器）的电路：接地与浮地回转器、频变负阻器及电容乘法器，这些电路的参数均可通过各CCCII的外接电流进行调节。所提出的系列电路在电路与系统的设计中有着重要的应用价值。     

OTA正弦振荡器的系统综合法研究

根据OTA和零-镜元件的端口约束关系,给出了OTA的8个零-镜描述,以此为基础,利用导纳矩阵扩展法实现了2种不同类型的OTA正弦振荡器:类型Ⅰ使用2个BO-OTA,共有4种不同形式;类型Ⅱ使用3个SO-OTA,共有8种不同形式。由于使用了规范数目的元件,所有电路容易被集成。电路的参数容易被电控调节。计算机仿真结果与理论一致。     

基于节点法求解线性网络灵敏度的系统方法

把矩阵的张量运算引入到电路的灵敏度计算中,并通过电路分析的节点法的增量方程,导出了计算电路灵敏度矩阵一般公式,提出了求解线性网络灵敏度的一种系统方法。该方法用于电路灵敏度计算,只需要进行一系列矩阵变换与运算,即可得到电路中节点电压和支路电压对电路参数的灵敏度矩阵,其运算过程规则便于用计算机编程实现,有较大的实用价值。     

基于节点法示解线性网络灵敏度的系统方法

把矩阵的张量运算引入到电路的灵敏度计算中,并通过电路分析的节点法的增量方程,导出了计算电路灵敏度矩阵一般公式,提出了求解线性网络灵敏度的一种系统方法。该方法用于电路灵敏度计算,只需要进行一系列矩阵变换与运算,即可得到电路中节点电压和支路电压对电路参数的灵敏度矩阵,基运算过程规则便于用计算机编程实现,有较大的实用价值。     

二端口变类器的表示与实现

本文将二端口变类器扩展为二端口变类器,导出了二端口变村变类器的复频域表示和电路实现。研究了用二端口回转器实现１型Ｍ－Ｒ变标变类器,从而解决了用微电子电路实现忆阻器的问题。     

Systematic synthesis of CCCCTA-based T-T filters using NAM expansion method

In the light of nullor-mirror models for current-controlled current conveyor trans-conductance amplifier (CCCCTA), initiating the admittance matrices of the Tow-Thomas (T-T) filter, three different types of the T-T filter are synthesised by means of the nodal admittance matrix (NAM) expansion method. The type A filter, which employ one CCCCTA, one grounded resistor and two grounded capacitors, has eight different forms, the type B filter, which employ one CCCCTA, two grounded capacitors and a second-generation current-controlled conveyor (CCCII) or an second-generation inverting current-controlled conveyor (ICCCII) or an operational trans-conductance amplifier (OTA), has 64 different forms and the type C filter employing one CCCCTA and two grounded capacitors has eight different forms. In all, 80 voltage-mode/current-mode T-T filter circuits are obtained. Because of using canonic number components, the circuits are highly desirable from the viewpoint of IC fabrication and their parameters can be electronically tuned through tuning bias currents of CCCCTAs. The hand analysis and computer simulation results have been provided to support the synthesis method.     

NAM expansion method for systematic synthesis of OTA-based floating gyrators

This paper presents a NAM expansion method for systematically synthesizing OTA-based floating gyrators. After describing nullor-mirror components of OTAs, class I, II and III gyrators, which can be built with standard OTAs, are synthesized by using the nullor-mirror equivalent models described by NAM. The class-I gyrators employing two DO-OTAs have four equivalent realizations, the class-II gyrators employing three SO-OTAs have eight equivalent realizations, and the class-III gyrators employing four SISO-OTAs have 16 equivalent realizations. Having used canonic number of components, the circuits are easy to be integrated and their parameters can be tuned electronically through tuning bias currents of OTAs. Finally, as an example, the MULTISIM simulation results of a notch filter constructed by the OTA-based III gyrator are presented to verify the realizability of the derived circuits.     

Generation of CCII and ICCII based Wien oscillators using nodal admittance matrix expansion

This paper introduces a new generation method of the grounded capacitor Wien oscillator circuits using current conveyors (CCII) or inverting current conveyors (ICCII) or combination of both of them. The nodal admittance matrix (NAM) of the single Op Amp Wien oscillator is taken as the starting point in the new approach of systematic synthesis of equivalent oscillators. The synthesis procedure is based on the generalized systematic synthesis framework using NAM expansion. The resulting derived 32 oscillators include many novel oscillators, using current conveyors or inverting current conveyors or both. Comparison between the generated oscillators based on the effect of parasitic elements on the oscillator performance is discussed.     

Generation of Generalized Impedance Converter Circuits Using NAM Expansion

The generation of the voltage generalized impedance converter (VGIC) circuits using a nodal admittance matrix (NAM) expansion is given in detail. Thirty-two equivalent circuits using current conveyors (CCII) or inverting current conveyors (ICCII) or a combination of both are generated. The reported circuits are suitable for realizing inductors or frequency dependent negative resistors (FDNR) using grounded passive elements. Similarly the generation of the current generalized impedance converter (CGIC) circuits published recently is reexamined and this resulted in 16 more new CGIC circuits using an alternative NAM expansion. Modification of two of the generated circuits to realize a floating inductor or floating FDNR is also given together with Spice simulation results.     

Current conveyor based or unity gain cells based two integrator loop oscillators

Four alternative families of oscillators are considered in this paper, three of the families employ CCII or ICCII or combination of both and each family has sixteen oscillator circuit members. The fourth family uses unity gain cells and has four circuit members. Two alternative transformation methods are used in this paper for the generation of oscillators. The first one uses the adjoint circuit theorem to obtain a new family of current mode oscillators from a voltage mode oscillator circuit. The second transformation method uses the nodal admittance matrix (NAM) expansion to generate a grounded passive element oscillator family from an oscillator circuit, which employs a virtually grounded resistor. Although this paper has a tutorial nature it includes two new families of oscillators; one of them provides both current and voltage outputs and the other provides voltage outputs and is based on the use of voltage, current followers and inverters. Simulation results are included to support the analysis.     

Carrier Travel Time in Transistors

A recently reported two current feedback operational amplifier (CFOA)-based oscillator is converted to a family of 16 current mode oscillators using CCII or ICCII or combination of both. A transformation method based on nodal admittance matrix (NAM) expansion is used to transform the floating capacitor CFOA-based oscillator circuit to a family of 16 grounded capacitor oscillators using CCII or ICCII or combination of both. Two of the new grounded capacitor oscillator circuits have a floating property. Simulation results are included.     

一系列用CCⅡ实现的接地回转器

本文提出了四种用CCⅡ实现的接地回转器，这些电路结构简单，易于集成。计算机仿真实验结果证实了四种实现方案的正确性。     

Quadrature oscillator using CCCCTAs and grounded capacitors with amplitude controllability

The realisation of two electronically tunable current-mode quadrature oscillators using Current Controlled Current Conveyor Tranconductance Amplifiers (CCCCTAs) and grounded capacitors is presented. The proposed circuits offer the following advantages. The condition of oscillation and the frequency of oscillation can be orthogonally controlled. Availability of electronic control of amplitude of output current is achieved. The oscillators have high outputs impedance which facilitates easy driving an external load without additional current buffers. The proposed circuits are constructed by using two active elements and all grounded capacitors which are attractive for integration and have low active and passive sensitivities. The PSPICE simulation and experimental results are included to show the workability of the proposed circuit.     

Systematic Synthesis of Compressive VDTA-Based T-T Filter with Orthogonal Control of fo and Q

Based on sixteen nullor-mirror models of the voltage differencing transconductance amplifier (VDTA) and port admittance matrices of the tow-Thomas (T-T) filter with orthogonal control between the characteristic frequency (f_o) and figure of merit (Q), two different categories of the voltage-mode and transconductance-mode T-T filters are synthesized by the means of the nodal admittance matrix (NAM) expansion method. The category A filter that employs two compressive VDTAs and two grounded capacitors includes four structures, and the category B filter that uses two compressive VDTAs, two grounded capacitors, and one grounded resistor, also includes four structures. These circuits are suitable for integrated circuit manufacture, and their parameters f_o and Q can be orthogonally adjusted with varying the bias currents of VDTAs. After the paper and pencil test is completed, the computer analyses, including alternating current (AC), parameter sweep, Monte Carlo (MC), and noise analyses, are performed to support the synthesis approach.     

Universal active current filters using single second-generation current conveyor

Two novel universal active current filters, one of which has multiple outputs and the other of which has a single output and high output impedance, employing a single negative second-generation current conveyor, three position-fixed capacitors and four/five position-fixed resistors are proposed. The proposed networks with the advantages of low passive sensitivities can obtain second-order lowpass, bandpass, highpass, notch and allpass current signals by adjusting the magnitudes of a grounded resistor and a grounded capacitor provided that another resistor is separable. The resonance angular frequency and quality factor are insensitive to the current tracking error of the nonideal CCII.<>