【正文】 .............................................................................. 8 第三章 電路設(shè)計(jì)方案的選擇與參數(shù)計(jì)算 ...................................................................................... 12 ........................................................................................................................ 12 ：?jiǎn)渭?jí)諧振放大電路的設(shè)計(jì) ................................................................................. 12 ：多級(jí)諧振放大電路的設(shè)計(jì) ................................................................................. 13 ........................................................................................................................ 15 ............................................................................................ 15 ................................................................................................................. 15 ..................................................................................................................... 16 ............................................................................................................. 17 .......................................................................................................... 17 ........................................................................................ 19 第四章 高頻諧振放大器電路測(cè)試結(jié)果分析 ................................................................................... 20 ................................................................................................................. 20 ..................................................................................... 20 ................................................................................. 21 ......................................................................................... 23 PCB圖 ...................................................................................................... 23 .......................................................................................................... 23 ................................................................................................................. 25 ................................................................................................................. 26 ...................................................................................................... 26 ............................................................................................ 27 第五章 總結(jié)： ............................................................................................................................. 32 參考文獻(xiàn) ......................................................................................................................................... 34 致 謝 ......................................................................................................................................... 35 附錄 1： .......................................................................................................................................... 36 附錄 2： .......................................................................................................................................... 39 合肥學(xué)院（畢業(yè)論文） 第 1 頁 共 39 頁 第一章 緒論 背景及意義 放大高 頻小信號(hào)（中心頻率在幾百 KHZ 到幾百 MHZ， 頻譜寬度在幾 KHZ 到幾十MHZ 的范 圍內(nèi)）的放大器，稱為高頻小信號(hào)放大器。 PassBand。 The resonant amplifier。 關(guān)鍵詞：高頻小信號(hào)、諧振放大器、諧振頻率、通頻帶、矩形系數(shù)、電壓增益 Design and analysis of high frequency amplifier based on Multisim ABSTRACT We know that the radio munication receiving apparatus receiving antenna electromagic waves ing from space, and senses the voltage amplitude of the high frequency signal is (μV) to several millivolts (mV), and the receiving circuit of the detector (or the frequency discriminator unit) of the input voltage amplitude higher, preferably about 1V. This requires highfrequency amplification and detection prior to the IF amplifier. To this end, we need to design highfrequency smallsignal amplifier, the pletion of the weak signal received by the antenna to select and amplify, from numerous radio wave signal, select the desired frequency signals to be amplified, and other unwanted signals, interference and noise suppression to improve the quality of the amplitude of the signal. The transistor collector load is typically posed of a parallel LC resonant circuit. Since the impedance of the LC parallel resonant circuit with frequency changes, can be analyzed in theory, at the resonant frequency of the parallel resonant presented purely resistive, and the maximum. The amplifier circuit has a resonant frequency will be the maximum voltage gain. If you deviate from the resonant frequency, the output gain is reduced. In short, the tuning amplifier only has the specific frequency signal amplification effect, but also plays the role of filtering and frequency selection. The design is based on a theoretical analysis, based on the actual production, with the LC oscillator circuit for the assistance, to eliminate high frequency amplifier to achieve selfoscillation and accurate frequency selection。 本次設(shè)計(jì)以理論分析為依據(jù)，以實(shí)際制作為基礎(chǔ)，用 LC振蕩電路為輔助，來消除高頻放大器自激振蕩和實(shí)現(xiàn)準(zhǔn)確的頻率選 擇；另加其它電路，實(shí)現(xiàn)放大器與前后級(jí)的阻抗匹配。若偏離諧振頻率，輸出增益減小。由于 LC 并聯(lián)諧振回路的阻抗是隨著頻率變化而變化，理論上可以分析，并聯(lián)諧振在諧振頻率處呈現(xiàn)純阻，并達(dá)到最大值。為此，我們就需要設(shè)計(jì)高頻小信號(hào)放大器，完成對(duì)天線所接受的微弱信號(hào)進(jìn)行選擇并放大，即從眾多的無線電波信號(hào)中，選出需要的 頻率信號(hào)并加以放大，而對(duì)其它無用信號(hào)、干擾與噪聲進(jìn)行抑制，以提高信號(hào)的幅度與質(zhì)量。學(xué)校代碼： 11059 學(xué) 號(hào)： 0905076032 Hefei University 畢業(yè)論文（設(shè)計(jì)） B A C HE L OR D I SSE RTAT I ON 論文題