Generation of second generation current conveyor (CCII) family from inverting second generation current conveyor (ICCII) family

Based on the nodal admittance matrix (NAM) representation of the voltage mirror (VM)–norator pair and considering the case of an inverting second generation current conveyor (ICCII?), it is found that the second generation current conveyor (CCII?) is a special case from the generalised ICCII?. Considering the NAM of the VM–current mirror pair, it is also found that the CCII+ is a special case from the generalised ICCII+.     

New active-gyrator circuit using a single current conveyer

A new canonic active RC circuit for realizing an ideal grounded inductor using a single second generation current conveyor as the active building block is described. The circuit may be considered as a novel active-gyrator circuit realized using only a single current conveyor.     

Analysis of the Noise Characteristics of CMOS Current Conveyors

The definition of the current conveyor is reviewed and a multiple-output second generation current conveyor (CCII) is shown to combine the different generations of current conveyors presently existing. Next, noise sources are introduced, and a general noise model for the current conveyor is described. This model is used for the analysis of selected examples of current conveyor based operational amplifier configurations and the noise performance of these configurations is compared. Finally, the noise model is developed for a CMOS current conveyor implementation, and approaches to an optimization of the noise performance are discussed. It is concluded that a class AB implementation can yield a lower noise output for the same dynamic range than a class A implementation. For both the class A implementation and the class AB implementation it is essential to design low noise current mirrors and current sources, and with the class AB design, the current mirror and current source noise can be reduced by using small values of bias current without compromising the maximum available output current.     

Impedance projection based transconductance amplifier

A current feedback technique is proposed to realise the transposition of grounded impedance to a floating impedance or transconductance. This technique, that can be viewed as an impedance projection, also allows one to implement a new current conveyor topology and to extend applications based on transconductance amplification. A theoretical approach of this new technique using a grounded impedance, two classical transconductance amplifiers and one second generation current conveyor only is presented.     

基于新型CCCⅡ的电流模式积分电路

介绍了电流模式电路的基本概念和发展概况,与电压模式电路相比较,电流模式电路的主要性能特点。并介绍了广泛应用于各种电流模式电路的第二代电流控制电流传输器原件的跨导线性环特性和端口特性,以及其基本组成共源共栅电流镜,并提出了基于共源共栅电流镜的新型COMS电流传输器。在此基础上,设计了基于电流控制电流传输器的电流模式积分电路,并利用Hspice软件进行输入为正弦波和方波时的输出波形的仿真验证。     

一种新型低压高电流驱动能力的CMOS电流传输器

设计了一种电压和电流跟随能力强,低压驱动性能好的第二代电流传输器.采用SMIC 0.18 μm工艺,利用Spectre对整个电路进行了仿真.电源电压为1.8 V,输入级采用轨对轨的结构,有效地提高了信号的摆幅;输出级采用AB类推免输出方式,在降低电路功耗的同时,也提高了电流的驱动能力.通过采用MOS管与电容串联的补偿方式,有效地改善了CCII+的频率响应特性.仿真结果表明,该CCII+的-3 dB带宽达709 MHz,X端输入电阻低于100 Ω,电流驱动能力为0.05 mA-2.5 mA,电路功耗为140 μW.     

The inverting second generation current conveyors as universal building blocks

The inverting second generation current conveyor ICCII includes two types. This paper concentrates on the two new types of the inverting current conveyor namely ICCII+ and ICCII-. Although it may seem that there is only minor difference between the two types, there is a significant difference as will be evident from some applications considered in this paper. Both the ICCII+ and the ICCII- are universal building blocks as will be demonstrated in this paper.     

Simple first order all-pass section using a single CCII

A novel first order all-pass section using a single second generation current conveyor is given. In addition the circuit uses two resistors and only one capacitor. The circuit is also realized with a translinear conveyor. The latter circuit uses only one external resistor and a capacitor. The proposed circuits are verified using PSPICE with attractive results.     

Novel CMOS current conveyor realizations suitable for high-frequency applications

Novel CMOS realizations of the second and the third generation current conveyors based on the use of the current conveyor of the first generation are given. The simulations show that these circuits have an excellent performance and an exceptional bandwidth.     

Novel CMOS Realization of Balanced-Output Third Generation Inverting Current Conveyor with Applications

A new current conveyor block, called a balanced-output third generation inverting current conveyor (ICCIII+−), is introduced in this paper. A novel CMOS realization for this block is proposed. To show the strength of this block, many applications are given, such as integrators, filters, and an oscillator. The proposed ICCIII+− and the presented applications are tested with SPICE simulations using CMOS 0.35 μm technology to verify the theoretical results.     

A new active-RC circuit realization of floating inductance

A new circuit which uses a single second generation current conveyor (CCII) [1], a single capacitor, and only two resistors and which simulates a lossy frequency-independent floating inductance without requiring any equality constraint is presented.     

一种基于第二代电流传输器的积分器设计

介绍了一种基于低压、宽带、轨对轨、自偏置CMOS第二代电流传输器(CCII)的电流模式积分器电路,能广泛应用于无线通讯、射频等高频模拟电路中。通过采用0.18μm工艺参数,进行Hspice仿真,结果表明:电流传输器电压跟随的线性范围为-1.04～1.15 V,电流跟随的线性范围为-9.02～6.66 mA,iX/iZ的-3 dB带宽为1.6 GHz。输出信号的幅度以20dB/decade的斜率下降,相位在低于3 MHz的频段上保持在90°。     

Wideband CMOS current conveyor

A novel CMOS second generation current conveyor (CCII) for high frequency current-mode signal processing is described. The input stage consists of a regulated current cell coupled to a source follower, and the output stage is a cascode current mirror. This architecture provides the high input/output conductance ratio for current transfer. Simulations show that a 3 dB bandwidth extends beyond 100 MHz     

Novel Ultra-Low-Power Class AB CCII+ Based on Floating-Gate Folded Cascode OTA

In this paper, a novel low-voltage ultra-low-power class AB current conveyor of the second generation based on folded cascode operational transconductance amplifier OTA with floating-gate differential pairs is presented. The main features of the proposed conveyor are design simplicity and rail-to-rail input voltage range at a low supply voltage of ±0.5 V. The proposed conveyor has a reduced power consumption of only 10 μW. Due to these features, the proposed conveyor could be successfully employed in a wide range of low-voltage low-power analog signal processing applications. PSpice simulation results using the 0.18 μm CMOS technology from TSMC are included to prove the results. As an example of application, a current-mode quadrature oscillator is designed and its functionality is proved by simulation.     

A novel variable frequency sinusoidal oscillator using a single current conveyor

A new active RC second-order sinusoidal oscillator using a single second generation current conveyor is described. A single grounded resistor adjusts the circuit for oscillation and a single grounded capacitor controls the oscillation frequency without affecting the oscilllation condition.     

Implementation of BIC monitor in balanced analogue self-test

The authors present the design of a dynamic built-in current (BIC) monitor for a new on-chip analogue self-test methodology. This methodology uses dynamic power supply current monitoring, and takes advantage of a redundancy in the structure of fully balanced circuits. The dynamic BIC monitor is based on a second generation current conveyor CCII+, and offers accurate measurement of supply current with minimal degradation in power supply voltage     

Inductor simulation using a current conveyor

Two schemes of simulating grounded inductors using a second generation current conveyor are reported. Both schemes provide simulated inductors that are relatively frequency independent, with suitable design, at moderately high-Q values.     

Precise realisation of current mode integrator using current conveyor

The realisation of a differential input current mode integrator network using the second generation current conveyor (CC II) is proposed. Even with nonideal CC IIs, true differential input capability and precise compensation of the time constant tau can be obtained by suitable design. A minimum of passive RC components is needed; their interchanged connection yields alternate differentiator functions.<>     

Minimal realisation for single resistor controlled sinusoidal oscillator using single CCII

A truly canonic second-order RC sinusoidal oscillator using a single second generation current conveyor is presented. The proposed structure uses two capacitors and only three resistors. The oscillation condition and oscillation frequency can be adjusted independently by two control resistors. Preliminary experimental result are shown.<>     

一种基于OTA和MOCCII实现的n阶多功能滤波器

提出了一种基于运算跨导放大器和第二代电流传输器结合的电流模式多功能滤波器方法。该方法是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,适当选定输入电流信号可同时实现低通、高通、带通、带阻等滤波功能,而电路内部结构及器件数目无需改变。与同类电路相比,其设计简便、结构简单、无源元件全部接地,且易于集成。同时文中还给出了滤波器的设计实例,Pspice仿真结果与理论分析相吻合,也验证了该方法的可行性。该滤波器可用于通信、电子测量与仪器仪表的信号处理中。