可重构多功能滤波器及其自动调谐电路的研究与设计

发布时间：2018-01-13 12:49

本文关键词：可重构多功能滤波器及其自动调谐电路的研究与设计　出处：《武汉大学》2014年博士论文　论文类型：学位论文

【摘要】：近年来,随着微电子产业的快速发展,射频无线接收机技术飞速前进,让同一个无线设备兼具多种功能,已成为微电子学和无线通信领域最具有革新性和前沿性的技术之一。基于互补金属氧化物半导体(Complementary Metal-Oxide-Semiconductor Transistor:CMOS)工艺的多模多频接收系统在性价比上大大超过单一系统的接收机,在无线通信领域中受到了广泛的关注。滤波器作为射频接收系统的关键模块之一,其结构和设计直接影响着整个通信系统的性能。在多模多频接收系统中,滤波器必须能够满足不同模式和多个频段的指标要求,这就要求其功能可配置,结构可重构,频率可调谐,且性能稳定。本文在系统综述国内外滤波器设计技术的基础上,分析了高性能,可重构模拟滤波器的设计方法。并提出了几种采用不同有源器件实现的高性能,可重构模拟滤波器。此外,深入研究了工艺因素、环境变化及器件老化、工作条件等对滤波器特性的影响,并提出了一种高精度,低失真的片上频率自适应系统。具体研究内容如下：首先,本文介绍了滤波器的基本原理和分类,分析了不同类型滤波器的特点以及自动调谐电路的作用和设计规则。其次,提出了一种基于高线性可调跨导运算放大器(Operational Transimpedance Amplifier:OTA)的多模多频滤波器。该滤波器通过改变OTA的跨导来切换不同的工作频率,而且同一个拓扑结构能够实现不同阶次的低通,带通以及复数滤波等功能,这些不同的功能通过控制三组开关的的通断来实现,并给出了电路仿真结果以验证所提出的方案可行。再次,设计了一种基于差动电压式电流传输器(Differential Voltage Current Conveyors:DVCC)的高阶电流模式多功能滤波电路。此电路功能多样,结构简单,通用性强,易于集成。更重要的是所采用的设计方法简单明了,可移植性强。并且针对DVCC不具备电调谐的缺点,提出了一种具有数字可编程控制的DVCC: DPDVCC(Digitally programmable DVCC:DPDVCC).并将其应用到高阶电压模式多功能滤波器设计中,该滤波器不仅具有和基于DVCC的滤波器类似的优点,而且能够独立调节其关键的技术参数。然后设计了一种基于电流传输跨导放大器(current conveyor trans-conductance amplifier:CCTA)的电流模式高阶多功能滤波器,该滤波器能够同时实现低通,带通,高通和带阻等功能,其品质因素和工作频率都可以通过调节偏置电流来实现电调谐。此高阶滤波器器件数目少,结构简单,非常适合制作全集成IC。最后,本文重点研究了工艺因素(如制造容差、工艺变化、温度漂移等),环境变化(如温度、电源电压)及器件老化、工作条件等因素,对芯片中所集成的电阻及电容值的影响,以及由此带来的滤波器关键性能的改变,归纳了片上自动调谐电路的设计规则以及方法,最后设计了一种高性能的片上自动调谐系统,并且用这个电路来调节一种全差分有源带通滤波器。将其成功应用到GPS/北斗双模双频的射频前端电路中,采用TSMC0.18//m的工艺流片,调节电路和滤波器电路两者共占芯片面积约为623.40x870.8μm2,在1.8V的电源电压下,消耗的电流约为5.2mA。测试结果能够满足接收机的系统指标要求。
[Abstract]:In recent years, with the rapid development of the microelectronics industry, the rapid progress of the wireless RF receiver technology, with a wireless device with multiple functions, has become one of the most innovative and advanced microelectronics and wireless communication technology. The complementary metal oxide semiconductor (Complementary Metal-Oxide-Semiconductor Transistor:CMOS) receiver based on technology of multi-mode multi frequency receiver system greatly more than a single system in cost, has received much attention in the field of wireless communication. One of the key modules of filter as the RF receiving system, its structure and design directly affects the performance of the whole communication system. In multimode multi frequency receiving system, filter must be able to meet the requirements of different mode and multiple frequency index this requires the function configuration, reconfiguration, frequency tunable, and stable performance.
Based on the systematic review of filter design technology, high performance analysis, reconfigurable analog filter design method is proposed. The high performance of several different active devices to achieve, reconfigurable analog filter. In addition, in-depth study of the process factors, changes in the environment and device aging, influence of working conditions on the filter the characteristics, and put forward a kind of high precision, low distortion frequency adaptive system on a chip. The specific contents are as follows:
First of all, this paper introduces the basic principle and classification of the filter, analyzes the characteristics of different types of filters, and the function and design rules of the automatic tuning circuit.
Secondly, based on the high linear adjustable transconductance amplifier (Operational Transimpedance Amplifier:OTA) multi-mode multi frequency filter. The filter by changing the OTA transconductance frequency to switch to a different, but the same topology can achieve different order low pass, band-pass and complex filtering and other functions, these different the function of three groups by controlling the on-off of the switch to achieve, and gives the circuit simulation results are presented to validate the proposed scheme is feasible.
Thirdly, design a differential voltage current conveyor (Differential Voltage Current Conveyors:DVCC) based on the high order current mode multifunctional filter circuit. The circuit of various functions, simple structure, strong versatility, easy to be integrated. It is more important to design the method simple, strong portability. And according to DVCC do not have electric tuning shortcomings, proposes a digital programmable control DVCC: DPDVCC (Digitally programmable DVCC:DPDVCC). And its application to high order voltage mode multifunction filter, the filter and the filter based on DVCC not only has the similar advantages, and can be independently adjusted to the key technical parameters.
Then design a transconductance amplifier current transmission (current conveyor trans-conductance amplifier:CCTA) based on the current mode high order multifunction filter, the filter can realize lowpass, bandpass, highpass and bandstop functions, the quality factor and the work frequency can be realized by adjusting the bias current to the high number of electric tuning. Order filter device, simple structure, very suitable for the production of fully integrated IC.
Finally, this paper focuses on the process factors (such as manufacturing tolerances, process variations, temperature drift etc.), environmental changes (such as temperature, power supply voltage) and aging device, working conditions and other factors, influence on the chip capacitor and resistor values, and change the key performance of the resulting filter, summed up the on-chip automatic tuning circuit design rules and methods, finally designed a high performance on-chip automatic tuning system, and use this circuit to adjust a fully differential active band-pass filter. The RF front-end circuit of its successful application to GPS/ Bei Dou dual-mode dual band in the process of TSMC0.18//m, regulation both circuit and filter circuit of total chip area is about 623.40x870.8 m2, in the power supply voltage of 1.8V, current consumption is about 5.2mA. test results can satisfy the system requirements of the receiver.

【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN713;TN851

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