發(fā)布時(shí)間：2019-06-28 10:02

【摘要】：混頻器(Mixer)是通信系統(tǒng)重要模塊之一,用于實(shí)現(xiàn)接收機(jī)的頻率轉(zhuǎn)換。國內(nèi)關(guān)于混頻器設(shè)計(jì)的研究常見于文獻(xiàn),而關(guān)于混頻器的測試研究相對較少,且由于測試方案、測試設(shè)備的限制不能實(shí)現(xiàn)完整的混頻器測試,測試經(jīng)驗(yàn)的不足也會(huì)導(dǎo)致不精確的測試結(jié)果,因此研究如何實(shí)現(xiàn)混頻器各項(xiàng)性能準(zhǔn)確、完善的測試尤為重要。本文首介紹混頻器的基礎(chǔ)知識,包括混頻器原理、電路結(jié)構(gòu)和性能指標(biāo)。然后針對混頻器的端口阻抗、轉(zhuǎn)換增益、線性度、噪聲系數(shù)等主要參數(shù)進(jìn)行了測試方法總結(jié)。接著詳細(xì)討論射頻測試板的去耦、接地等設(shè)計(jì)要點(diǎn),在Allegro軟件中實(shí)現(xiàn)亞德諾半導(dǎo)體(ADI)公司的混頻器ADL5801芯片測試板的原理圖和測試板設(shè)計(jì),交付測試板打樣后進(jìn)行焊接。最后搭建針對混頻器芯片不同測試項(xiàng)的測試平臺,對900MHz、1900MHz、2500MHz、3500MHz四個(gè)射頻輸入頻點(diǎn)進(jìn)行實(shí)際測試,固定中頻153MHz下,轉(zhuǎn)換增益分別為:1.78dB、1.76dB、-0.159d B、-0.722dB;1dB壓縮點(diǎn)分別為:12.64dBm、12.5dBm、12.5dBm、11.26dBm;三階交調(diào)點(diǎn)分別為:28.24dBm、24.16dBm、22.11d Bm、17.17dBm;噪聲系數(shù)分別為:9.75dB、11.21dB、12.51dB、16.78dB。與datasheet參考值進(jìn)行對比后對結(jié)果進(jìn)行了分析,測試結(jié)果對比表明本文采取的測試方法基本能夠滿足混頻器芯片測試。文末對論文工作進(jìn)行梳理總結(jié),同時(shí)確定后續(xù)工作的努力方向。
[Abstract]:The mixer is one of the important modules of the communication system for realizing the frequency conversion of the receiver. the domestic research on the design of the mixer is common in the literature, and the test study on the mixer is relatively small, and due to the test scheme, the limitation of the test equipment can not realize the complete mixer test, the shortage of the test experience can lead to inaccurate test results, So it is very important to study how to realize the accurate and perfect performance of the mixer. This paper first introduces the basic knowledge of the mixer, including the mixer principle, the circuit structure and the performance index. The main parameters such as the port impedance, the conversion gain, the linearity and the noise figure of the mixer are then summarized. Next, the design points of decoupling and grounding of the RF test board are discussed in detail, and the schematic diagram of the ADL5801 chip test board and the design of the test board of the ADL5801 chip test board of the mixer of the Analog Devices are implemented in the Allegro software, and the test board is delivered for welding. Finally, a test platform for different test items of the mixer chip is set up, and the actual test is carried out on the four radio frequency input frequency points of 900 MHz,1900 MHz,2500 MHz and 3500 MHz. The conversion gain is 1.78 dB, 1.76 dB,-0.159 d B,-0.722 dB at the fixed intermediate frequency of 153 MHz, and the 1 dB compression point is 12.64 dBm, 12.5 dBm, 12.5 dBm, 11.26 dBm, respectively; The third-order intermodulation point is 28.24 dBm, 24.16 dBm, 22.11 d Bm, 17.17 dBm, and the noise figure is 9.75 dB, 11.21 dB, 12.51 dB, 16.78 dB, respectively. The results are compared with the datasheet reference value, and the results of the test show that the test method is basically able to meet the test of the mixer chip. At the end of the paper, the paper summarizes the work of the paper, and determines the direction of the follow-up work.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN773

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