本文選題：射頻放大器　切入點：射頻電源　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：射頻放大器應(yīng)用于很多領(lǐng)域,射頻電源就是其中之一。本文主要研究射頻電源中的射頻放大器。該放大器是核心模塊,其性能直接決定了整個系統(tǒng)的性能。設(shè)計要求不同于其它領(lǐng)域的放大器,實現(xiàn)大功率、高效率、高線性度、低諧波和低雜波一直是設(shè)計難點。本文緊密圍繞射頻電源中射頻放大器的實際應(yīng)用,針對效率增強、雜波和諧波抑制及濾波器優(yōu)化技術(shù)展開研究。提出了一種新的放大器設(shè)計方案。該方案將濾波器從第二級放大器之后移到第一級和第二級之前。改變傳統(tǒng)的先放大后濾除諧波與雜波的模式,改為先濾波后放大射頻信號,顯著提高了放大器系統(tǒng)的效率。設(shè)計了一種諧振濾波器。該濾波器利用LC串聯(lián)電路和LC并聯(lián)電路的阻抗特性,實現(xiàn)頻率選擇和帶通濾波作用。前者對諧振頻率信號阻抗小,對偏離諧振頻率的信號阻抗大;后者的阻抗特性相反。通過二者的串聯(lián)與并聯(lián)組合,射頻信號無損通過,雜波信號被吸收。設(shè)計了一種三傳輸線變壓器。該變壓器連接在功放器輸入端和輸出端,起抑制諧波與雜波、及變換阻抗的作用。重新設(shè)計了推挽式放大器作為功放器,修改了偏置和直流調(diào)理電路,在功放管的柵極和漏極接入緊密耦合的互感變壓器�；ジ凶儔浩饔兄趯崿F(xiàn)射頻信號高增益無損放大。利用Smith圓圖工具設(shè)計了匹配電路。通過ADS軟件對13.56MHz放大器做了仿真分析。設(shè)計和制作了27.12MHz放大器電路,測試性能參數(shù),整體性能滿足指標(biāo)要求。
[Abstract]:RF amplifier is used in many fields, RF power supply is one of them. This paper mainly studies RF amplifier in RF power supply. This amplifier is the core module. Its performance directly determines the performance of the whole system. The design requirements are different from other fields of amplifier, to achieve high power, high efficiency, high linearity, Low harmonics and low clutter are always the difficulties in design. This paper focuses on the practical application of RF amplifiers in RF power supply, aiming at enhancing the efficiency. Research on clutter and harmonic suppression and filter optimization is carried out. A new amplifier design scheme is proposed, which moves the filter from the second stage amplifier to the first stage and before the second stage, and changes the traditional preamplifier. The mode of filtering out harmonics and clutter, A resonant filter is designed, which utilizes the impedance characteristics of LC series circuit and LC parallel circuit. Frequency selection and bandpass filtering are realized. The former has small impedance to resonant frequency signal and large impedance to signal deviating from resonant frequency, while the latter has the opposite impedance characteristic. A three-transmission line transformer is designed, which is connected to the input and output terminals of the power amplifier to suppress harmonics, clutter and transformation impedance. The push-pull amplifier is redesigned as the power amplifier. Modified bias and DC conditioning circuits, The tightly coupled mutual-inductance transformer is connected to the gate and drain of the power amplifier tube. The mutual inductance transformer is helpful to realize the high gain nondestructive amplification of RF signal. The matching circuit is designed by using the Smith circle diagram tool. The 13.56MHz amplifier is designed by ADS software. The circuit of 27.12MHz amplifier is designed and fabricated. Test performance parameters, the overall performance to meet the requirements.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN722

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相關(guān)期刊論文 前10條

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本文編號：1590643