【作者】 董珍珍；

【导师】 刘高辉；

【作者基本信息】 西安理工大学 ， 通信与信息系统， 2009， 硕士

【摘要】 随着社会信息化的进程越来越快,从上个世纪80年代后期,数字信号处理算法的功能日益增强,集成电路技术的进步,许多传统上用模拟电路实现的信号处理功能很容易用数字方式来实现。但是,随着信号数据率的提高和信号带宽的增加,导致数字信号处理电路规模和功耗增大。因此,不能满足未来信息社会对电子系统中小型化和低功耗的发展要求。随着微电子技术的不断发展,模拟器件或数模混合型器件在高速、低功耗电路的优势逐渐突显出来。基于此背景,针对传统的滤波器电路本文提出了一种数模混合型实现方法,其核心是用数字电路控制的模拟电路对时域离散、幅度连续的信号进行处理。首先,本文介绍了数模混合型滤波器的概念和特点,从高速、低功耗两方面考虑,提出了数模混合型滤波器不同的实现结构。对CDMA通信系统中数模混合型序列匹配滤波器的实现结构进行了详细的介绍,结合序列型匹配滤波器的数模混合型实现方法,提出了FIR滤波器的数模混合型实现结构,并对其结构进行了MATLAB仿真。其次,利用CMOS器件的优点,研究了基于CMOS运放实现的数模混合型滤波器的实现方法。对基于CMOS运放实现的序列型匹配滤波器的电路结构及其工作原理进行了详细介绍,参考序列型匹配滤波器的实现结构提出了基于CMOS运放实现的FIR滤波器的实现结构,对其电路结构和工作原理进行了详细的讨论。与全数字滤波器电路相比,简化了电路结构,同时大大减少了元器件的数目。再次,为了验证滤波器电路功能的正确性,采用PSpice仿真软件分别对基于CMOS运放实现的序列型匹配滤波器和FIR滤波器进行了仿真验证,对不同参数下仿真结果产生的误差进行了分析,并提出了基于CMOS运放实现的FIR滤波器的改进方法。最后,对神经元MOS的结构和特性进行了介绍,并提出了基于神经元MOS实现的FIR滤波器的实现方法。该方法采用互补型神经元MOS源极跟随器来实现滤波器电路的关键部分——加权求和电路,对其电路结构和电路工作原理进行了详细的讨论,用PSpice软件对其进行了仿真验证,表明了其功能的正确性。更多还原

【Abstract】 With more and more rapid progress of the information society, from the late 80’s of the last century, the functions of the digital signal processing are enhanced day by day. With the developing of integrated circuit technology, many signal processing function realized by traditional analog circuits can be achieved by digital signal processing. However, With the increases of signal data rate and signal bandwidth, the scale of digital signal processing circuit is large, which need more power consumption. So it can not meet the requirement of miniaturization and lower power consumption of electronic system in the coming information society. With the continuous development of microelectronic technology, the advantage of analog or mixed analog-digital equipment is more obvious in the high-speed and low-power consumption circuit. According to this background, this paper presents a mixed analog-digital signal processing methods, the core of which is to use the analog circuit controlled by digital circuit to process the continuous signal with discrete time-domain.Firstly, this paper introduces the concepts and features of the mixed analog-digital filter and proposes the different realized structure of mixed analog-digital filter in the aspects of high-speed and low power consumption. The implemented structure of the mixed analog-digital sequence matched filter of CDMA communication system was detailed presented. Also, this paper introduces the mixed analog-digital realized structure of FIR filter according to the mixed analog-digital realized method of sequence matched filter, and its structure was confirmed by MATLAB software.Secondly, with the advantages of CMOS devices, the sequence matched filter implemented by CMOS operational amplifiers was presented the realized method of mixed analog-digital filter is worked out based on the CMOS operational amplifiers. It, which structure and working principle are described in detail. This paper introduces the realized structure of FIR filter and discusses the circuit structure and working principle of it, then finish the MATLAB simulation. Comparing with all-digital filter circuit, this method simplifies circuit structure and reduces device quantity.Thirdly, in order to verify correctness of filter circuit function, this paper uses PSpice simulation software to confirm the sequence matched filter and FIR filter realized based on CMOS operational amplifiers. And analysis the error of simulation results under different parameters, and introduces improving realized method of FIR filter based on CMOS operational amplifiers.Finally, neuron MOS structure and characteristics are introduced, and FIR filter realized method based on neuron MOS was presented. The method uses complementary neuron MOS source follower circuit filter to achieve the key part of filter circuit-weighted sum. Then this paper discusses its circuit structure and working principle in detail, and uses the simulation results of PSpice software to verify the correctness of its functions.更多还原