自跟踪对数域滤波器的设计  

Design of Self-tracking Log-Domain Filter

作　　者：郑丽蓉[1] 马胜前[1] 马永杰[1] ZHENG Lirong MA Shengqian MA Yongjie(Key Laboratory of Atomic and Molecular Physics ＆ Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, Chin)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州730070

出　　处：《吉林大学学报（理学版）》2017年第2期416-423,共8页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:61162017);西北师范大学青年教师科研能力提升计划项目(批准号:NWNU-LKQN-13-16)

摘　　要：在LC梯形网络设计的基础上,提出一种流控自跟踪二阶滤波器的电路结构和实现方法.输入的电压信号先经放大电路处理后,再经限幅电路、整形电路及宽频频率电流转换电路组成的频率自跟踪电路,将放大的电压信号转换为电流信号,以该电流信号作为对数域滤波电路的偏置电流控制端间接调节滤波器的截止或中心频率,从而实现滤波频率对输入频率的自动跟踪.仿真实验结果表明,带通滤波器和低通滤波器的最高中心频率为30MHz,对输入频率的跟踪范围为1~30 MHz.仿真实验验证了该设计方法的有效性和可行性.We presented a circuit structure and realization method of the current-controlled selftracking filter which based on the design of LC ladder network.The input voltage signal was firstly processed by the amplifying circuit,and then the frequency self-tracking circuit was composed of amplitude limiting circuit,shaping circuit and broadband frequency-current conversion circuit.The amplified voltage signal was converted into the current signal which was used as the bias current control end of the log domain filter circuit to adjust the cut-off frequency or central frequency of the filter.Therefore,frequency of the filter could automatically track the input signal frequency.Simulation experiment results show that the highest central frequency of the band-pass filter and low-pass filter is 30 MHz,and the tracking range of input frequency is from 1 MHz to 30 MHz.Simulation results verify the effectiveness and feasibility of the proposed method.

关 键 词：自跟踪滤波器 宽频频率电流转换电路 自跟踪 对数域滤波器 

分 类 号：TN713[电子电信—电路与系统]