N通道带阻滤波器谐波分析与抗混叠研究

doi:10.16088/j.issn.1001-6600.2020032402

摘要/Abstract

摘要： N通道带阻滤波器的谐波混叠干扰是一个普遍存在的问题,因此对其抗混叠能力提出了更高要求。本文首先采用伴随网络方法,推导出输入电压到电容采样电压的传递函数,简化了谐波传递函数的计算过程。然后推导出N通道带阻滤波器的完整谐波传递函数,并采用电路仿真加以验证。在UMC110 CMOS工艺环境下,通过分析滤波器参数对谐波混叠的影响,得出适当增加通道数或增大电容值可有效抑制谐波混叠干扰的结论。仿真结果显示,当通道数为16、电容值为50 pF时,滤波器的最大谐波混叠能控制在-27 dB以下,具备良好抗混叠效果。同时提出一种N通道带阻滤波器与前置选频器件级联的设计方案以消除谐波混叠,前置器件截止频率应小于N-1倍的N通道滤波器中心频率。

关键词: N通道滤波器, 带阻滤波器, 开关电容, 谐波, 谐波混叠, 伴随网络

Abstract: The interference of harmonic aliasing in N-path band-stop filter is a common problem, resulting in higher requirements for its interferer-tolerant performance. Firstly, the harmonic transfer functions relating the input to the voltage sampled on the capacitor are derived using the adjoint network, which simplifies the calculation of the harmonic transfer functions. Then the complete harmonic transfer functions of N-path band-stop filter are derived which are verified by the simulation of the circuit. The influence of filter parameters on harmonic aliasing is analyzed in UMC110 CMOS technology. It is concluded that the aliasing interference can be effectively suppressed by appropriately increasing the number of paths or the capacitance. The simulation result shows, that the max harmonic folding of the filter can be controlled below -27 dB, which has good anti-aliasing effect when the channel number is 16 and the capacitance is 50 pF. A cascaded design scheme of N-path band-stop filter and pre-frequency-selected device is proposed to eliminate harmonic folding. The cut-off frequency should be less than N-1 times the central frequency of N-path filter.

Key words: N-path filter, band-stop filter, switch capacitor, harmonic, harmonic aliasing, adjoint network

中图分类号:

TN713

蒋品群, 顾燊, 宋树祥, 岑明灿. N通道带阻滤波器谐波分析与抗混叠研究[J]. 广西师范大学学报（自然科学版）, 2021, 39(2): 81-89.

JIANG Pinqun, GU Shen, SONG Shuxiang, CEN Mingcan. Harmonic Analysis and Anti-aliasing Research of N-path Band-stop Filter[J]. Journal of Guangxi Normal University(Natural Science Edition), 2021, 39(2): 81-89.

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