毕业设计---基于电流传输器的有源滤波电路的设计

2012届毕业设计说明书基于电流传输器的有源滤波电路的设计系、部：电气与信息工程学院摘要近年来，以其在速度、精度、带宽、动态范围等方面的优势，电流模式的电路设计方法正在取代电压模式的传统设计方法，电流模式电路的发展和应用将把现代模拟集成电路推进到一个新的阶段。

而作为电流模式电路中最通用的积木模块第二代电流传输器( Second generation current conveyor,简称CCII)也越来越收到人们重视。

第二代电流传输器作为电流模式电路中最重要和最通用的有源积木块，在如有源滤波器、模拟信号处理、A/D和D/A转换器等方面己逐渐取代了传统的电压运放。

CCII的性能优劣既取决于作为两输入端口间电压跟随电路的能力、也取决于阻抗相差悬殊的两个端口IC传输电流的能力，因此，实现CCII的高精度与高驱动能力就必须采用合适的电路结构。

模拟滤波器是滤波器的重要发展方向，而电流模式信号处理方式是当前模拟集成滤波器实现的主要方式。

作为电流模式电路中最为通用模块，基于CCII的有源滤波器的研究就显得尤为重要。

由于传统的CCII因其只有输出端，由其及RC元件构成的滤波器具有以下两点不足:不能兼顾电流信号直通和反馈，电路设计较为复杂。

为了解决传统CCII 在滤波器应用中所存在的两点不足，因此提出了一种单端输出的CCII。

本文在士1V供电电压下，设计了一种跟随精度好、频带宽的单输出的第二代电流传输器。

并在此基础上通过CCII的级联和外加电阻、电容设计基于CCII 的多输出单输入和单输出多输入两种多功能滤波器电路。

在CCII的设计中，通过电路内部的电路结构提供偏置，达到了减少芯片面积和降低功耗的目的;采用轨对轨的输入结构，有效地提高了信号的输入输出摆幅，并做了分析。

本文设计的电路采用TSMC 0.35um CMOS工艺，利用multisim软件对整个电路进行了仿真。

基于CCII设计的多输入单输出和单输入多输出两种滤波器都实现了低通、高通、带通以及带阻的滤波特性，中心频率和品质因素可独立调节的特性,multisim仿真得出，滤波器理论值和仿真值基本相吻合，所提出滤波器方案正确。

关键词:电流模式;第二代电流传输器;轨对轨;滤波器AbstractIn recent years, the design method of the current model circuit is insteading of the design method of the voltage model circuit for their speed、precision, bandwidth and dynamic range etc. The development and application of the current model circuit will push the modern analog circuits to a new stage. The second generation current conveyor (CCII) as the most common building blocks module in the current model circuit has gained the attention of research.The second generation current conveyor has been used as the most important and versatile active building blocks in current model circuit. Today the replace the conventional OPAMP in so many applications such as active filters, analog signal procession and AID, D/A converters. The function of CCII is mainly decide by the accuracy of current and voltage transfer ,so we must adopt the fit circuit structure to achieve an accurate voltage control and high current driving capability.The analog filter is an important developing direction in filter; Current signal processing is one of the most important methods in analog integrated filters. The research of the continuous time filter based on CCII as the most common building blocks module is more important.Filter constituted by one input conventional CCII and RC have two faults:(a) directing and feedback of current can't coexist (b) filter circuit is too complex. The modified mufti-output CCII is presented to solve two faults.In this paper, a novel CMOS rail-to-rail self-biased mufti-output second generation current conveyor with士1 V power supply is presented which achieve an accurate current and voltage transfer and wide bandwidth. We also design a mufti-input single-output voltage model second-order filter and a single-input mufti-output current model second-order active filter based on CCII and resistance, capacitance. In the design of CCII, it adopts the rail-to-rail input structure to improve the signal swing; Thanks to its self-bias circuit, the proposed CCIII reduce chip areas andlow power consumption. In addition, the impact of the rail-to-rail input structure is analyzed.Simulation result using HSPICE with TSMC 0.35 um technology are also presented,simulation result show that the CCII has achieve a -0.94V~0.91 V voltage dynamic range and voltage transfer error equal to 0.08dB with -3dB frequency of about 451.2 MHz; The current driving range is -2mA~1.7mA and current transfer error between terminal Z+ and X is 0.02 dB with -3 dB frequency bandwidth of about 334.1 MHz;The current driving range is-1.7mA~2mA and current transfer error between terminal Z-and X is 0.05dB with-3dB frequency bandwidth of about 665.8 MHz;The resistance of terminal X only is 0.02 S2 with a power consumption o# Mufti-input single-output voltage model second-order filter and single-input mufti-output current model second-order active filter based on second generation current conveyor is presented, which realize the characteristic of low pass、high pass、band pass and band elimination, separately adjustable centre frequency. And the quality factor Q. Theoretical analysis and computer simulation indicate that the proposed circuits are effective.Keyword: current model; second generation current conveyor; rail-to-rail; filter目录1 绪论 (1)1.1 序言 (1)1.2 本论文研究的背景与意义 (1)1.3 电流传输器及其滤波器的国内外研究现状 (4)1.3.1 电流传输器的国内外发展和研究现状 (4)1.3.2 基于CCII滤波器的国内外发展和研究现状 (6)1.4 研究方法 (7)1.4.1基本模块CCII的研究方法 (7)1.5 本文内容安排 (7)2 第一代、第二代电流传输器的原理及其应用 (8)2.1 Nullator和Norator模型 (8)2.2 第一代电流传输器(CCI) (9)2.2.1 第一代电流传输器定义 (9)2.2.2 第一代电流传输器的电路实现 (10)2.3 第二代电流传输器（CCII） (11)2.3.1 第二代电流传输器定义 (11)2.3.2 第二代电流传输器的实现基础 (12)2.3.3 第二代电流传输器的实现 (15)2.3.4 第二代电流传输器的应用 (15)2.4 本章小结 (17)3 滤波器基本理论 (18)3.1 滤波器发展回顾 (18)3.2 滤波器的基础知识 (19)3.3 滤波器的种类和基本参数 (20)3.3.1 滤波器的种类 (20)3.3.2 滤波器主要参数 (21)3.4 二阶滤波器传递函数的分析 (22)3.5 本章小结 (23)4 基于第二代电流传输器的滤波器设计 (24)4.1 基于CCII的有源滤波器 (24)4.1.1 低通(Low pass)滤波器 (24)4.1.2 高通(High pass）滤波器 (25)4.1.3 带通(Band pass）滤波器 (26)4.1.4 带阻(Notch pass)滤波器 (26)4.3 元件灵敏度分析 (27)4.4 本章小结 (28)5 版图的设计 (29)5.1 器件版图匹配的设计考虑 (29)5.1.1 元器件匹配的基本规则 (29)5.1.2 CMOS晶体管的匹配 (29)5.1.3 电阻的匹配 (30)5.2 版图设计的其他考虑 (30)5.3 电路版图及验证 (30)5.3.1 CCII的版图 (30)5.3.2 版图的验证 (32)总结 (33)参考文献 (34)附录 (36)1绪论1.1序言近年来，电流模式(Current Model )集成电路在模拟集成电路信号处理方面以其低功耗、高速度、低压、高精度、带宽和动态范围等方面优良的性能而广泛应用于高频、高速信号处理领域。