共查询到19条相似文献,搜索用时 109 毫秒
1.
2.
通过对不同结构的广义切比雪夫型LC滤波器的传输零点特性进行分析验证,得到适用于N阶广义切比雪夫型LC滤波器传输零点特性的结论。基于这些结论提出一种快速设计广义切比雪夫型LC滤波器的方法,大大缩短了设计滤波器的时间。并且该方法可以在实现滤波器带外截止特性的同时,实现滤波器小型化,在科学研究和工程应用中具有重要意义。 相似文献
3.
提出了一种运用开关电流技术实现切比雪夫低通滤波电路的方法。将双二次滤波器的传递函数由s域进双线性z变换,确立了基于开关电流积分器的双二次节电路,利用这种双二次节可以实现开关电流滤波器。文中采用双二次低通滤波器级联实现了六阶切比雪夫低通滤波器的设计与仿真,仿真结果表明切比雪夫低通滤波器的陡峭衰减特性和理想幅频特性符合设计要求,从而证实了该方法的可行性和正确性。 相似文献
4.
广义切比雪夫滤波器是一种高性能滤波器形式,用经典的综合方法提取其参数复杂且难以实现。本文以指定的电路拓扑结构和传输零点作为已知条件,结合遗传算法和单纯形下山法用MATLAB编程实现了一种新的灵活、有效的广义切比雪夫滤波器等效电路参数的优化提取方法。并给出了归一化耦合系数的物理意义及其工程应用系数转换公式。 相似文献
5.
基于基片集成波导设计了一种正交分裂环谐振器,并证明了该谐振器具有双负特性。将该超结构放置于双层基片集成波导中,得到了具有频率选择特性的四端口耦合结构。将加载正交分裂环谐振器的耦合结构与广义切比雪夫滤波器相结合,设计了一种X波段SIW广义切比雪夫超结构滤波器。仿真结果表明,设计的滤波器满足了中心频率为10.519 GHz、相对带宽为0.25%、通带内的插入损耗小于-1 dB、回波损耗小于-20 dB的技术指标。 相似文献
6.
传统基于优化理论的耦合系数提取方法依赖于繁琐的优化程序,耗时长且收敛效果无法保证。对此,提出一种快速的耦合系数提取方法。该方法从单端输入阻抗的零极点角度进行分析,推导出滤波器的特征多项式与谐振频率与零极点的函数关系,并采用Matlab语言编程实现了耦合系数提取算法。应用该算法对4阶切比雪夫滤波器的耦合系数进行了提取分析,提取结果与理论结果吻合良好,证明了该方法的正确性和有效性。 相似文献
7.
8.
9.
一、引言宽频带,高方向性波导定向耦合器,其耦合机构,一般都是采用多孔耦合阵,而多孔耦合阵,又分为均匀直线阵,二项式阵以及切比雪夫阵。其中以切比雪夫阵为最佳,所谓切比雪夫阵,就是阵中每个小孔的电压耦合系数与切比雪夫多项式的系数成比例。这种耦合阵的特点是方向性曲线在一定值附近等幅摆动,而摆动的波纹数与阵中的元数成比例,孔数越多,摆动的波纹数也越多。第二个特点是方向性的频带较宽,即使在频带边缘方向性特性曲线也不产生恶化。 相似文献
10.
11.
《Solid-State Circuits, IEEE Journal of》1981,16(4):348-355
Starting with a double terminated Chebyshev LC ladder filter, a CCD wave filter has been implemented by using CCD resonators and charge amplifiers as basic building blocks. The bandpass filter which was realized on a test chip has a center frequency of 50 kHz, together with a relative Chebyshev bandwidth of 2.6 percent, 5 dB insertion loss, and more than 60 dB stopband attenuation. Compared to known SC filters, the advantages of the new approach are in extremely low sensitivity of the center frequency which is controlled by an external clock frequency, and a relative bandwidth which does not depend on the center frequency, but is controlled by capacitance ratios. Filter design, some aspects related to implementation, and experimental results are described. 相似文献
12.
Alfonso Fernandez-Vazquez Gordana Jovanovic Dolecek 《Circuits, Systems, and Signal Processing》2014,33(7):2237-2250
This paper introduces the generalized IIR Chebyshev filters. The proposed filters are obtained by applying bilinear transformation to the corresponding analog filters. The novelty of the method is the introduction of a new rational Chebyshev function, which includes Chebyshev Type I and Chebyshev Type II IIR filters as special cases. The application of the proposed digital filters to design perfect reconstruction two-channel filter banks is described. The proposed filters can be applied in orthogonal discrete wavelet transform. 相似文献
13.
Often in infinite impulse response (IIR) filter design, our critical design parameter is the cutoff frequency at which the filter's power decays to half (-3 dB) the nominal passband value. This article presents techniques that aid in the design of discrete-time Chebyshev and elliptic filters given a 3-dB attenuation frequency point. These techniques place Chebyshev and elliptic filters on the same footing as Butterworth filters, which traditionally have been designed for a given 3-dB point. The result is that it is easy to replace a Butterworth design with either a Chebyshev or an elliptic filter of the same order and obtain a steeper rolloff at the expense of some ripple in the passband and/or stopband of the filter. 相似文献
14.
15.
Chebyshev过渡型滤波器设计和分析 总被引:1,自引:1,他引:0
传统的Chebyshev滤波器具有较差的相位特性,其阶跃响应具有较大的过冲和较长的调节时间。本文从传递函数的极点角度,对Chebyshev滤波器进行了改进,改进后的滤波器表现出典型的过渡特性,在对幅度特性影响较小的情况下,改善了传统Chebyshev滤波器的相位特性和阶跃响应。通过对滤波器极点的调整,消除了传统Chebyshev滤波器过冲和传统偶数阶Chebyshev滤波器的稳态误差。 相似文献
16.
The paper proposes a modification of the chained filtering function for low sensitivity symmetrical response microwave filters. The new filtering function uses generalized Chebyshev polynomials as a seed function. The proper return loss grouping leads to low sensitivity filters. It is estimated and compared the responses' sensitivity of modified chained filter and Chebyshev filter. It is proven that the attenuation of the even order chained filters is 6 dB less than the corresponding Chebyshev filter. 相似文献
17.
This paper proposes a novel multifold finite-ground-width coplanar waveguide (CPW) lambda/4 resonator filter that has the capability of realizing attenuation poles by cross coupling of nonadjacent resonators. The newly proposed multifold structures not only greatly shrink the length of a resonator, but also provide a convenient way to implement cross coupling in a filter. The proposed multifold finite-ground-width CPW resonators can have much stronger coupling than that of spiraling and meandering layouts, and any number of folds is possible. Two combline filters are designed and measured with twofold and threefold lambda/4 finite-ground-width CPW resonators. A trisection and a quadruplet generalized Chebyshev filter formed by cross couplings between nonadjacent resonators have been implemented by modifying the layout of the resonator. These filters are smaller in size and have the capability of controlling attenuation poles 相似文献
18.
Vlastimir D. Pavlović 《International Journal of Electronics》2013,100(5):582-602
In this article, the all-pole low-pass filter function with mini-max for the summed sensitivity function in the pass-band is considered. With the application of Chebyshev polynomials of the first kind, the proposed filter function is obtained in an explicit form with a maximum number of oscillations of the summed sensitivity function in the pass-band. The calculation of the filter function is derived by using the summed sensitivity function as a starting point. New original approximation function is derived in order to achieve a mini-max summed sensitivity function in the filter pass-band. Sensitivity analysis is carried out and a comparison of the summed sensitivity and the group delay of the proposed and classical all-pole filters is given. Minimisation of the summed sensitivity function is important for reduction of the deviation of the magnitude response caused by temperature changes of the continuous-time active filters implemented into the analogue front end or as programmable chips. 相似文献
19.
Design techniques for a new class of integrated monolithic high-permittivity ceramic waveguide filters are presented. These filters enable a size reduction of 50% compared to air-filled transverse electromagnetic filters with the same unloaded Q-factor. Designs for Chebyshev and asymmetric generalised Chebyshev filter and a diplexer are presented with experimental results for an 1800 MHz Chebyshev filter and a 1700 MHz generalised Chebyshev filter showing excellent agreement with theory. 相似文献