具有跳耦结构的电流模式低通滤波器设计

本文讨论了电流模式ＲＣ梯形结构滤波器的一种有源实现方法－－跳耦法，以此实现的电流模式低通滤波器采用ＣＣⅡ，ＣＣⅠ器件做为有源器件，比相应 电压模式电路结构简单，且ＲＣ元件全部接地。这种跳耦结构和梯形结构一样具有低的元件灵敏度。     

单CCⅡ电流模式滤波器

报道了基于单CCⅡ（第二代电流传输器）的电流模式滤波器电路。该电路仅由一个CCⅡ及几个无源RC元件构成，能实现一阶低、高通，二阶低、带、高通滤波器。与同类电路[5.6]比较，该电路结构简单，接地RC元件较多，便于集成。还分析了无源和有源灵敏度，并给出了实验的结果。     

跳耦结构差分式连续时间电流模式电流镜滤波器

在差分式电流模式电流镜积分器的基础上，提出了一个跳耦结构差分式连续时间电流模式五阶切比雪夫低通滤皮器的电流镜电路和设计方案。讨论了电流模式跳耦结构滤波器的设计方法，给出了所提出的滤波器电路的设计机仿真结果。该滤波器电路继承了电流镜电路、差分式电路、跳耦结构滤波器的优点，具有适于低电太供电、消除偶次谐波、元件灵敏度低、传递函数失真小等特点。     

基于第三代电流传输器的有源滤波器的导出

阐述了由电压模式有源RC滤波器导出基于电流传输器(CCIII)的电流模式连续时间滤波器的方法.即由运算放大器(OA)滤波器导出CC滤波器;导出的电流模式2阶滤波器结构简单,能实现2阶低通、高通、带通滤波,不仅所有无源和有源灵敏度都很低,而且当无源参数确定后,有源参数对极点频率W0不产生影响,W0保持恒定.HSPICE仿真表明,提出的电路是可行的.     

基于CC多输入单输出电流模式滤波器

为了实现结构简单、便于集成的三输入单输出电流模式滤波器,提出了三输入单输出电流模式滤波器的信号流图。用CC(第二代电流传输器)及多端输出的电流镜实现了该信号流图,得到一个由CC及电流镜共同构成的电流模式滤波器。该滤波器由2个CC、1个三端输出的电流镜及4个RC元件构成,能方便地实现5种滤波器输出。该滤波器可用于通信、电子测量与仪器仪表中的信号处理。硬件实验结果表明提出的电路是正确的。     

基于CCⅡ多输入单输出电流模式滤波器

为了实现结构简单、便于集成的三输入单输出电流模式滤波器,提出了三输入单输出电流模式滤波器的信号流图。用CCⅡ（第二代电流传输器）及多端输出的电流镜实现了该信号流图,得到一个由CCⅡ及电流镜共同构成的电流模式滤波器。该滤波器由2个CCⅡ、1个三端输出的电流镜及4个RC元件构成,能方便地实现5种滤波器输出。该滤波器可用于通信、电子测量与仪器仪表中的信号处理。硬件实验结果表明提出的电路是正确的。     

用电流传输器CC实现RC滤波器

提出了采用电流传输器作有源器件实现RC滤波器,其电路结构简单,使用元件数目少,输入阻抗高,电路级联无需阻抗匹配。     

多输入多输出CCⅡ电压模式滤波器

提出了两种 CC (第二代电流传输器 )多输入多输出的电压模式滤波器电路。第一种电路为三输入二输出滤波器电路 ,由 2个 CC +(同相 CC )及 4个 RC元件构成 ,能实现 1 0个不同条件下的滤波器 ,并能实现4种具有同时两端输出的滤波器 ;第二种电路为四输入两输出滤波器电路 ,由 1个 CC +、1个 CC -(反相CC )及 5个 RC元件构成 ,能实现 2 2个不同条件下的滤波器 ,并能实现 6种具有同时两端输出的滤波器。与同类电路比较 ,电路结构简单、功能更强。文中还给出了 CC +及 CC -的实现电路 ,并对提出的滤波器电路进行了硬件实验。     

用电流传输器CC实现RC滤波器

提出了采用电流传输器作有源器件实现RC滤波器，其电路结构简单，使用元件数目少，输入阻抗高，电路级联无需阻抗匹配。     

一种高输入阻抗单CCII电压模式滤波器

提出了一种实现高输入阻抗电压模式滤波器的新电路。该电路使用一个CCII(第二代电流传输器)和最少量的RC元件实现一阶低通、一阶高通及二阶带通滤波器。一阶滤波器仅含3个接地RC元件,二阶滤波器含4个RC元件,其中电容均接地。给出了电路的有源及无源灵敏度及计算机PSPICE仿真结果     

Current-Mode Active RC Filters Using Current Followers

In this letter, a realization of current-mode active filter using current followers as active element is described. We show the constructions of second-order lowpass, highpass and bandpass filters. The high-order filters can be realized by a cascade connection of these second filters. As examples, the second-order lowpass and highpass filters are designed for frequency of 5 MHz. The effectiveness of the proposed method is demonstrated through SPICE simulation.     

Practical minimum-capacitance very-low-frequency RC active network

A practical solution to the problem of capacitance minimisation in very-low-frequency RC active networks is presented. The proposed multiloop structure functions as a lowpass filter, a medium Q factor bandpass filter or an oscillator and achieves capacitance enhancement via the well known Miller effect.     

Low component current-mode universal filter

A low component current-conveyor based current-mode universal filter with one input and three outputs is presented. The filter can simultaneously realise lowpass, highpass and bandpass responses. Realisation of notch and allpass responses does not require additional active elements. The proposed circuit enjoys low active and passive sensitivities     

Design of an active distributed RC lowpass filter using exponential lines

A new active distributed RC structure, utilising exponential lines, is proposed for realising lowpass transfer functions. Explicit design equations are given for realising a pair of complex poles using this structure. This is based on a dominantpole approximation of the structure. It is shown that the pole Q sensitivity decreases with increasing taper and that it may be made considerably lower than that of Kerwin's structure which uses uniform lines.     

Cascadable current-mode single CCII biquads

A new configuration for the realisation of current-mode single-CCII-biquad (SCB) filters with high output impedance is presented. It can synthesise lowpass, bandpass, highpass, notch, and allpass filtering functions with a single CCII connected to five passive RC one-port elements. The quality factor, Q, and the central frequency, omega /sub 0/, of the proposed SCBs are insensitive to the current tracking error of the CCII. These SCBs have the advantages of low passive sensitivities and independently adjustable omega /sub 0/ or Q.<>     

由单CCⅡ及接地RC构成的混合模式滤波器

提出了一个结构简单的混合模式滤波器模型电路。由该模型电路可产生一阶低通、一阶高通及二阶低通、二阶带通滤波器。所有滤波器仅由一个ＣＣⅡ及四至五个接地ＲＣ元件构成。比较同类电路［５］,这一电路结构简单得多,且所有ＲＣ元件接地,便于集成,电路的灵敏度很低     

Current mode filter structure based on dual output transconductanceamplifiers

A new current-mode filter structure based on the dual output operational transconductance amplifier is described. By appropriate choice of components, the structure provides lowpass, highpass and bandpass responses. Experimental results which confirm the theoretical analysis are given     

New current-mode current-controlled universal filter with single input and three outputs

In this study, a new current-mode current-controlled universal filter with single input and three outputs is presented. The proposed circuit uses single-output current controlled conveyors (CCCIIs) and can simultaneously realize lowpass, bandpass and highpass filter functions all at high impedance outputs. Realization of notch and allpass responses does not require additional active elements. The circuit enjoys independent current-control of the parameters ω₀ and ω₀/Q without disturbing the gains of the lowpass, bandpass and highpass filters. Both its active and passive sensitivities are low.     

Current-mode and voltage-mode universal biquads using a single current-feedback amplifier

A new current-mode universal biquad and a new voltage-mode universal biquad using a single current-feedback amplifier are proposed in this paper. Both biquads enjoy the following advantages: realization of highpass, bandpass and lowpass filtering from each configuration, avoidance of input voltage tracking error in a current-feedback amplilfier; only one active component; no requirement for match components; low passive and active sensitivities. An inverting amplifier is used to form a notch filter. Experimental results are obtained to prove the theoretical analyses.