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web前端-接收机前端N通道滤波器的谐波分析与抑制机理的应用研究.pdf
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摘要
II
结构更加接近理论上的理想值,因此具有更好的谐波抑制效果。最终仿真得到的 3 次和 5
次谐波抑制分别达到 31dB 和 37dB,优于一级增益结构。
(2)针对传统 N 通道滤波器谐波抑制方法中前置滤波器通带不可随 N 通道滤波器中
心频率动态调节的问题,将原本通带相对较为固定的前置滤波器改进为 N通道陷波滤波器,
其中心频率设置为 N 通道带通滤波器的 3 倍,则可以动态抑制 3 次谐波。且 N 通道带通
滤波器的通道数为 5,级联滤波器可同时动态抑制 3 次和 5 次谐波。最终设计的级联结构
滤波器 3 次和 5 次谐波抑制分别为 26dB 和 31dB,与近年来达到同样功能的设计相比,可
不使用低噪声放大器或者跨导放大器,电路结构简单易实现。
关键词:N 通道滤波器;开关电容;谐波抑制;带阻滤波器;伴随网络法
万方数据
Abstract
III
Harmonic Analysis and Application Research on Harmonic Rejection
Mechanism of N-Path Filter in Receiver Front-End
Master Candidate: Shen Gu Grade: 2017 Supervisor: Pinqun Jiang, Shuxiang Song
Major: Electronic and Communication Engineering
Research Direction: Analog Integrated Circuit Design
Abstract
In recent years, the development of radio communication technology has entered a new stage
with the rapid progress of integrated circuit technology. N-path filter is widely used in multi-mode
and multi-frequency radio receiver system because of its advantages of easy integration,
programmable adjustment to center frequency, high frequency selectivity and good linearity.
However, due to the sampling characteristics of N-path filter, unwanted harmonic noise will appear
at the multiple of switching frequency, which affects the performance and communication quality
of receiver. Therefore, it is necessary to research in the harmonic rejection of N-path filter, which
is a hot topic in recent years.
The traditional method of harmonic rejection is to add a pre-filter in front of N-path filter.
However, for the harmonics which move dynamically in frequency spectrum with the change of
center frequency, the pass band of the prefilter is relatively fixed, so it is difficult to achieve good
harmonic suppression effect. Therefore, it is necessary to develop a specific harmonic rejection
method to dynamically reject the varying harmonics in the frequency spectrum. The differential
N-path filter can eliminate even harmonics, so that the key to the design of harmonic rejection N-
path filter is to reject odd harmonics.
In this paper, the harmonic theory and harmonic rejection mechanism of N-path filter are
studied. Based on the theoretical research, two harmonic rejection N-path filters are designed and
verified by simulation. The main work and research results are as follows:
1. In theory:
( 1 ) Based on the harmonic transfer functions of N-path band-pass filter derived by
predecessors, the complete harmonic transfer functions of N-path band-stop filter is derived, which
provides theoretical basis for the research of harmonic rejection and anti-aliasing of N-path filter.
An equivalent model of adjoint network is established for N-path band-stop filter. The original
analysis of linear periodic time varying system is simplified to that of linear time invariant system.
And the original solution process of the capacitance sampling output response in the frequency
domain is simplified from the perspective of the time domain.
(2)Based on the derived harmonic transfer functions, the influence of the main parameters
万方数据
Abstract
IV
of the filter on the effect of harmonic aliasing is analyzed by simulation. The theoretical analysis
and the simulation results show that the harmonic aliasing can be effectively rejected by
appropriately increasing the number of paths or the capacitance. According to the functions, the
the pass band range of the pre-selected frequency device is determined to achieve great anti
harmonic aliasing effect.
2. In circuit structure:
(1)The 3-branch N-path filter based on polyphase signal synthesis technology and its
harmonic rejection mechanism are studied. Theoretically, the filter can completely eliminate the
3rd and 5th harmonic when the gain amplitude ratio of the 3 branches is the ideal value. However,
the ratio is irrational, it cannot be realized in the actual circuit but only be approximated. The N-
path filter with the original one-stage gain structure is improved to two-stage gain structure, and
the gain amplitude ratio of the filter is optimized by the two-stage gain structure, which is closer
to the theoretical value compared with the one-stage structure, so it has better harmonic rejection
effect. The 3rd and 5th harmonic rejection is 31dB and 37dB respectively, which is better than the
one-order structure.
(2)In order to solve the problem that the pass band of the pre-filter cannot be dynamically
adjusted with the center frequency of the N-path filter in traditional harmonic rejection methods,
the original pre-filter with relatively fixed pass band is improved to the N-path notch filter, whose
center frequency is set to 3 times of the N-path band-pass filter, then the third harmonic can be
dynamically suppressed. The path number of the N-path bandpass filter is 5 so that the cascaded
filter can reject 3rd and 5th harmonics simultaneously. The 3rd and 5th harmonic rejection of the
cascaded filter are 26dB and 31dB respectively. Compared with the designs that achieves the same
function in recent years, the cascaded filter does not have low noise amplifier or transconductance
amplifier, and the circuit structure is simple and is easy to realize.
Key Words: N-path filter; switch capacitor; harmonic rejection; band-stop filter; adjoint network
method
万方数据
目录
V
目录
摘要 ................................................................................................................................................... I
Abstract ........................................................................................................................................... III
目录 ..................................................................................................................................................V
第 1 章 绪论 ...................................................................................................................................... 1
1.1 N 通道滤波器的研究背景及意义 ......................................................................................... 1
1.2 N 通道滤波器的研究现状 .................................................................................................... 2
1.3 论文的主要研究内容与结构安排 ......................................................................................... 4
第 2 章 N 通道滤波器谐波抑制的理论基础 ........................................................................................ 5
2.1 基本 N 通道滤波器 ............................................................................................................. 5
2.1.1 基本 N 通道滤波器的结构与原理 ................................................................................ 5
2.1.2 基本 N 通道滤波器的传递函数 .................................................................................... 6
2.2 谐波抑制 N 通道滤波器的主要性能参数 .............................................................................. 8
2.3 谐波抑制方法 ..................................................................................................................... 9
第 3 章 N 通道带阻滤波器的谐波与抗混叠分析 ............................................................................... 12
3.1 伴随网络方法 ................................................................................................................... 12
3.1.1 伴随网络方法概述 .................................................................................................... 12
3.1.2 建立伴随网络模型 .................................................................................................... 13
3.2 N 通道带阻滤波器的谐波传递函数 .................................................................................... 16
3.3 电路仿真验证与抗谐波混叠分析 ....................................................................................... 18
3.3.1 仿真验证 .................................................................................................................. 18
3.3.2 器件参数对于抗谐波混叠效果的分析 ........................................................................ 19
3.3.3 引入前置选频器件抑制谐波混叠 ............................................................................... 21
第 4 章 基于多相信号合成技术的两级谐波抑制 N 通道滤波器设计................................................... 24
4.1 谐波矢量叠加消除原理 ..................................................................................................... 24
4.2 两级谐波抑制结构 ............................................................................................................ 28
4.2.1 两级谐波矢量叠加消除原理 ...................................................................................... 28
4.2.2 精度误差分析 ........................................................................................................... 29
4.3 两级谐波抑制 N 通道滤波器结构 ...................................................................................... 31
4.4 版图与仿真验证................................................................................................................ 33
第 5 章 抑制 3 次和 5 次谐波的级联 N 通道滤波器设计 .................................................................... 37
5.1 级联结构设计原理 ............................................................................................................ 37
5.2 级联 N 通道滤波器结构 .................................................................................................... 39
万方数据
目录
VI
5.3 版图与仿真验证................................................................................................................ 41
第 6 章 总结和展望 ......................................................................................................................... 46
6.1 总结 ................................................................................................................................. 46
6.2 展望 ................................................................................................................................. 47
参考文献 ......................................................................................................................................... 48
攻读硕士学位期间的科研成果.......................................................................................................... 52
致谢
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