共查询到19条相似文献,搜索用时 453 毫秒
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本文在分析整数和半整数分频以及双模前置小数分频原理的基础上,提出了一种改进的双模前置小数分频算法,并对改进算法的性能进行了分析.分析表明,采用改进算法进行任意小数分频器设计,可以在一个计数循环内达到相位平均偏差等于0,其相位抖动均方差也要远小于双模前置小数分频器,值得在实际应用中加以推广. 相似文献
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音乐信号频率覆盖了20 Hz到20 kHz的范围,音响系统为了高质量的还原它们,往往将音乐信号分为高、低两个频率段或者高、中、低3个频率段后,分别送给两分频音箱或者三分频音箱去重放.如果分频器位于功率放大器之前,称之为电子分频系统,如果分频器在功率放大器之后,称之为功率分频系统.打磨一套电子分频音响系统,除了设计组装高质量的后级功率放大器之外,前级分频器的设计就显得非常重要.本文就是依据实际制作经验和数据,就巴特沃斯2阶2分频器以及2阶3分频器在音响系统中的使用提出自己的见解. 相似文献
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一种新型分频器的设计实现 总被引:2,自引:0,他引:2
针对现有的常用分频器的使用局限性,介绍了一种可以实现任意小数、分数分频的新型分频器。由预先设置的分频参数,通过使用一个带余数输出的除法器,计算出其商和余数,以确定两个分频器的分频系数和分频次数,通过控制两个分频器交替工作,从而实现任意分频。分析了这种新型分频器的工作原理,提出了一种简单的实现电路,并用VerilongHDL语言描述了该分频器,在FPGA上运行实现,通过仿真证明其可行性。 相似文献
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针对传统阵列天线设计流程中功分器繁琐的设计过程, 基于满足-3 dB范围为0°~12°, -10 dB波束宽度为65°, 波束覆盖为65°, 中心频率为9.05 GHz的余割平方扩展波束赋形要求, 设计了一种幅度固定唯相位实现波束控制的新型串馈结构Gysel功分器.该功分器幅度为固定值, 此幅度分布满足余割平方赋形阵列天线幅度的分布特征, 在遗传算法计算出理想赋形激励后只需调整该功分器的输出相位值就能实现高拟合度的余割平方扩展波束赋形, 大为减少了传统设计中功分器所需的设计时间. 相似文献
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一种基于天牛须算法的新型超宽带功分器研究 总被引:1,自引:0,他引:1
根据对马刺线的原理分析,该文提出一种新型马刺线结构,并在此基础上设计出一种新颖的超宽带功分器(频率范围为2.5~13.2 GHz)。该超宽带功分器尺寸较小,制作结构简单,带内传输特性好,输入与输出端口的回波损耗均小于–12 dB,带内插入损耗小于3.5 dB。在设计过程中,根据理想传输线模型,利用奇偶模分析方法,推导出设计的目标函数,并利用天牛须算法对其进行优化设计,有效提高了功分器的设计准确性和灵活性。为了验证设计的准确性,采用材料RO4003C作为基板设计超宽带功分器。实验结果表明,采用新型马刺线结构的超宽带功分器结合天牛须算法有效缩短了计算时间,提高了设计精度,可以广泛运用于超宽带功分器设计。 相似文献
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针对传统基片集成波导(substrate integrated waveguide,SIW)功分器设计中宽带化和小型化不易兼顾的问题,提出了一种基于慢波SIW(slow-wave SIW, SW-SIW)的功分器. 采用微带折线构成的慢波结构单元加载于SIW金属表面上,代替传统SIW连续的金属表面,与同尺寸的SIW相比,SW-SIW的截止频率下降了40%,能够实现横向尺寸的缩减,尤其当SW-SIW达到与SIW相同的相移量时,SW-SIW所需纵向尺寸更小. 所提出的基于SW-SIW的功分器在具有较宽带宽的同时实现了器件尺寸的减小. 通过测试结果可得,该功分器在8.25~12.8 GHz频带内的反射系数|S11|10 dB,相对带宽达到了43.2%,相位一致性良好且小型化效果明显,适用于紧凑型微波射频前端. 相似文献
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介绍了一种基于内匹配功率管的Wilkinson微带功率分配器设计新思路。传统Wilkinson微带功率分配器在低频段体积大,用于内匹配功率管时很难在规定的尺寸范围内使用,采用高介电常数陶瓷基片辐射损耗大,直流转换效率低。适当引入不连续性,提高端口阻抗值,端口阻抗引入的虚部参与后续匹配网络的新型Wilkinson微带功率分配器,与传统Wilkinson功率分配器相比,体积更小,效率更高,有很好的实用价值。设计的工作频段在5.2~5.8 GHz的Wilkinson微带功率分配器,在整个频带内输出功率大于50 dBm,饱和功率增益高于7 dB,功率附加效率大于30%。 相似文献
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Leung Chiu Quan Xue 《Microwave Theory and Techniques》2007,55(11):2419-2426
In this paper, a new power divider concept, which provides high flexibility of transmission line characteristic impedance and port impedance, is proposed. This power divider is implemented on a parallel-strip line, which is a balanced transmission line. By implementing the advantages and uniqueness of the parallel-strip line, the divider outperforms the conventional divider in terms of isolation bandwidths. A swap structure of the two lines of the parallel-strip line is employed in this design, which is critical for the isolation enhancements. A lumped-circuit model of the parallel-strip swap including all parasitic effects has been analyzed. An equal power divider with center frequency of 2 GHz was designed to demonstrate the idea. The experimental results show that the equal power divider has 96.5% -10-dB impedance bandwidth with more than 25-dB isolation and less than 0.7-dB insertion loss. In order to generalize the concept with an arbitrary power ratio, we also realize unequal power dividers with the same isolation characteristics. The impedance bandwidth of the proposed power divider will increase with the dividing ratio, which is opposite to the conventional Wilkinson power divider. Unequal dividers with dividing ratios of 1 : 2 and 1 : 12 are designed and measured. Additionally, a frequency independent 180 power divider has been realized with less than 2 phase errors. 相似文献
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Mohammad Bemani Saeid Nikmehr Shahram Hosseinzadeh 《AEUE-International Journal of Electronics and Communications》2013,67(5):382-386
This paper focused on the application of negative refractive index transmission line (NRI-TL) in dual-band unequal Wilkinson power divider (WPD) with controllable frequency and power dividing ratio. Theory and design procedure of the dual-band NRI-TL are presented in details. For demonstration, two dual-band unequal Wilkinson power dividers (WPDs) with power dividing ratio of 2 : 1 and operating frequencies of 0.9 and 1.8 GHz are designed, fabricated and tested. The first unequal divider is based on 2-stage NRI-TLs and the second one is based on 4-stage NRI-TLs. In addition, these two types of NRI-TLs are presented to demonstrate that by increasing the number of NRI-TL unit-cells the phase response of the NRI-TLs converge to the desired characteristic. The good agreement between measured and simulated results confirmed the design concept and derived closed-form design equations. Measurements show that the first divider has 18.37% and 21.86% relative bandwidths and the second one has 33.52% and 29.12% relative bandwidths at 0.9 and 1.8 GHz, respectively. The design concept of this paper can be extended to equal dual-band power dividers with arbitrary frequency ratio. 相似文献
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应用于频率合成器的宽分频比CMOS可编程分频器设计 总被引:2,自引:0,他引:2
提出一种应用于射频频率合成器的宽分频比可编程分频器设计。该分频器采用脉冲吞吐结构,可编程计数器和吞脉冲计数器都采用改进的CMOS源极耦合(SCL)逻辑结构的模拟电路实现,相对于采用数字电路实现降低了电路的噪声和减少了版图面积。同时,对可编程分频器中的检测和置数逻辑做了改进,提高分频器的工作频率及稳定性。最后,采用TSMC的0.13μm CMOS工艺,利用Cadence Spectre工具进行仿真,在4.5 GHz频率下,该分频器可实现200515的分频比,整个功耗不超过19 mW,版图面积为106μm×187μm。 相似文献