基于实频技术的功率放大器研究

发布时间：2018-02-13 16:57

本文关键词： 实频技术网络综合双带宽带功率放大器连续类功率放大器 Doherty Chebyshev滤波器　出处：《电子科技大学》2017年博士论文　论文类型：学位论文

【摘要】：功率放大器(或功放)是无线发射系统中的一个重要部件,所以功放的研究显得尤为重要。功放设计者需要具备充分的理论基础和工程经验才能设计出满足应用需求的产品,这就要求设计者事先投入大量的时间和精力,从而增加了开发成本。为了解决这一问题,本论文通过对高性能的功放结构和匹配网络设计理论的研究,为功放的程序化设计提供了一定的理论基础并给出了匹配网络的实现方案。首先,本论文对功放的性能提升技术进行了研究,其内容包括:降低电路网络的优化变量数目、提升功放效率、抑制并发模式下的带间交调分量、滤除谐波功率。为此,提出了一种半解析的匹配方法、一种双路双带功放结构、一种谐波有损的匹配结构。其次,针对宽带和双带功放匹配网络的实现问题,提出了基于实频技术的分布参数网络匹配方法。最后,提出了一类准切比雪夫阻抗函数,其可以应用到实频技术的高阶匹配网络设计中;提出了一种网络综合方法,以保证高阶阻抗函数能顺利地完成网络综合。本文的主要内容和创新点如下:1、提出了一种半解析的功放匹配网络设计方法。该方法让匹配网络中各元件以等电长度的方式进行构建,能有效地降低匹配网络中优化变量的数目,而这种电路网络与由集总参数构成的匹配网络的匹配能力相当。在匹配实现过程中,为了进一步地降低变量数目,又把匹配网络的设计分为三步,从而达到快速寻找最优匹配网络的目的。通过一个2.4/3.5GHz的双带功放和0.9-2GHz的超宽带级联功放的匹配设计,验证了这种半解析方法的有效性。2、提出了一种双路双带功放结构,该结构能确保双带功放在两个频带都具有最优的性能,同时还可以抑制谐波和带间交调分量。这一结构通过一个工作在0.9/1.8GHz的双带功放和一个工作在1.8/2.5GHz双带Doherty进行了验证。本文也提出了一种谐波有损的拓扑结构,它不但具有谐波抑制作用还能预防谐波阻抗失配引起的性能恶化。这一结构通过一款1.6-2.6GHz的宽带功放进行了验证。3、提出了一种基于实频技术的分布参数匹配网络设计方法。该方法使用的代价函数能更好地描述功放阻抗的匹配情况;也引入了Richards变换,以便得到能代表分布参数匹配网络的阻抗函数。通过一款0.9-2.8GHz的宽带功放对所提出方法进行了验证。测试结果显示,在工作频带内,输出功率大约为39.5dBm,附加效率介于52.2%-85.1%之间,增益在14.2-16.8dB的范围内。4、提出了一种基于实频技术的次最优双带功放设计方法。该次最优设计方法扩展了阻抗解空间,使基波与二次谐波间的阻抗映射关系变成了区域到区域的映射。同时,提出了一种基于驱动点阻抗函数的增强型代价函数,它能更好地控制谐波阻抗。为了验证这种匹配网络设计方法,通过一款2.4/3.5GHz的双带功放进行说明。两个带的增益分别为10.6dB和11.2dB,输出功率分别为40.6dBm和41.2dBm,漏极效率分别为70.3%和71.4%。5、提出了一种基于Feldtkeller矫正的网络综合方法。该方法通过Feldtkeller等式实时地对剩余阻抗函数进行矫正,以保证函数中的各系数得到矫正,从而确保了网络综合的顺利进行。通过对100个随机产生的35阶阻抗函数进行网络综合,所得到的平均相对误差为3.7565*10~(-5),该实验表明此综合方法能胜任低于36阶的阻抗函数。6、提出了一种基于实频技术和拓展切比雪夫函数的半解析设计方法。所提出的准切比雪夫函数,在相同的阶数、相同的阻抗变换比和特定反射系数的限定条件下,仍然具有一族阻抗函数能完全满足这些条件。从这一类阻抗函数中综合出的第一个元件值分布在一个较大的范围内,可从中选择一个能完全吸收晶体管的寄生参数和封装参数的阻抗函数,使这些寄生和封装元件作为匹配网络的一部分。这样,在这一阻抗函数匹配下,从电流源端面看出的基波阻抗为一实数,能使基波处于较好的匹配状态。把这一函数作为实频技术网络函数实现的初始值,通过几次迭代便能得到一个最优的匹配网络。根据实际需求,也可以直接地把这一族阻抗函数灵活地应用到滤波器或者阻抗变换器的设计中。为了验证这一方法的可行性,设计两个分别工作于1.7-2.4GHz和1.6-3.5GHz的宽带功放。
[Abstract]:The power amplifier (or power amplifier) is an important component of a wireless transmission system, so the power amplifier power amplifier research is particularly important. Designers need to have sufficient theoretical basis and engineering experience can be designed to meet the application needs of the product, which requires designers to spend a lot of time and energy, thus increasing the cost of development. In order to to solve this problem, this paper through the research of high performance power amplifier structure and matching network design theory, provides certain theoretical foundation for the program design and implementation scheme of power amplifier is given matching network. Firstly, the performance of power amplifier lifting technology is studied, which includes the number of optimization variables to reduce the circuit network, improve power efficiency, inhibit the subsequent pattern between the band intermodulation components, eliminating harmonic power. Therefore, this paper proposes a kind of semi analytical matching Method, a dual band power amplifier structure, matching structure of a harmonic loss. Secondly, aiming at the problem of implementation of broadband and dual band power amplifier matching network, is proposed to match the distribution parameters of network technology based on the real frequency method. Finally, a quasi Chebyshev impedance function is proposed, which can be applied to high order matching network the design of the real frequency technique; puts forward a comprehensive method of network, to ensure the high order impedance function can successfully complete the network. The main contents and innovations of this paper are as follows: 1, the paper presents a semi analytical power amplifier matching network design method. This method makes the matching network for each component in the electric length the way of construction, can effectively reduce the number of optimization variables, in the network, and the matching ability of network, the network and the circuit consists of lumped parameter equivalent. In the matching process, in order to further Reduce the number of variables, and the design of matching network is divided into three steps, so as to achieve the purpose of finding the optimum matching network. By matching the design of ultra wideband amplifier cascade a 2.4/3.5GHz dual band power amplifier and 0.9-2GHz, to verify the validity of the.2 semi analytical method, proposed a dual band power amplifier structure, the structure can ensure that the dual power amplifier has the best performance in two bands, but also can suppress harmonic and inter band intermodulation components. This structure by a 0.9/1.8GHz dual band power amplifier and a pair of Doherty in 1.8/2.5GHz was verified. This paper also presents the topological structure of a harmonic loss it not only has the performance degradation of harmonic suppression can prevent harmonic impedance mismatch. This structure was verified by a 1.6-2.6GHz.3 broadband power amplifier, is presented based on the real frequency Matching technology of distributed parameter network design method. The cost function used in this method can better describe the matching of power amplifier impedance; also introduces Richards transform, in order to obtain the representative distribution parameters of impedance matching network function. Through the broadband power amplifier is a 0.9-2.8GHz of the proposed method was verified. The test results show that, in the work within the band, the output power is about 39.5dBm, additional efficiency is 52.2%-85.1%, the gain in the range of 14.2-16.8dB.4, proposed a real frequency technique is sub optimal design method based on dual power amplifier. The optimal design method of extended impedance solution space, the impedance mapping between the fundamental and two harmonic mapping between turns area to area. At the same time, we proposed an enhanced cost function based on the driving point impedance function, it can better control the harmonic impedance. In order to verify this. Distribution network design method, described by a 2.4/3.5GHz dual band power amplifier with gain. Two were 10.6dB and 11.2dB, the output power was 40.6dBm and 41.2dBm, the drain efficiency of 70.3% and 71.4%.5 respectively, puts forward a comprehensive network correction method based on Feldtkeller. This method uses Feldtkeller equation in real time the remaining impedance function is corrected, to ensure that all the coefficients of the functions have been corrected, so as to ensure the comprehensive network smoothly. Through the comprehensive network of 100 randomly generated 35 order impedance function, the average relative error is obtained by 3.7565*10~ (-5), the experimental results show that this method is capable of integrated impedance function is lower than.6 36 order, based on real frequency technique and extended Chebyshev semi analytical design method. Quasi Chebyshev function is presented, in order of the same, the same impedance Qualification conversion ratio and specific reflection coefficient, still has a impedance function can fully meet these conditions. The first element is synthesized from this sort of impedance function values in the distribution in a larger range, the impedance function can choose a parasitic parameters can be fully absorbed and packaging parameters from transistor that makes these parasitic and packaging components as part of the matching network. So, in this, the impedance function, the impedance seen from the end of the current source is real, the fundamental in the matching state better. The initial function as the real frequency technique network function value by several times the iteration can get an optimal matching network. According to the actual demand, can also be directly to the family of impedance function is flexibly applied to design filters or impedance converter. In order to verify this method The feasibility of designing two broadband power amplifiers that work on 1.7-2.4GHz and 1.6-3.5GHz respectively.

【学位授予单位】：电子科技大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TN722.75

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