本文關(guān)鍵詞：射頻前端高線性度混頻器的研究與設(shè)計(jì)　出處：《廣西師范大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 下混頻器 第三階跨導(dǎo)系數(shù) WLAN 高線性度 GPS

【摘要】：隨著無線通信網(wǎng)絡(luò)的高速發(fā)展,對(duì)無線通信設(shè)備的性能提出了更高的要求,高性能的無線接收機(jī)射頻前端迫切需要。在射頻接收機(jī)前端中,混頻器是一個(gè)關(guān)鍵性模塊,其線性度決定了整個(gè)接收機(jī)的動(dòng)態(tài)范圍,因此研究高線性度混頻器已成為人們研究射頻接收機(jī)系統(tǒng)的重點(diǎn)。一般而言,隨著混頻器動(dòng)態(tài)范圍的提高,混頻器的直流功耗也隨之增加。所以如何在低功耗的基礎(chǔ)上提高混頻器的線性度,同時(shí)兼顧其他性能,是目前混頻器設(shè)計(jì)的難點(diǎn)。本論文首先闡述了 GPS衛(wèi)星導(dǎo)航和WLAN 802.11b/g標(biāo)準(zhǔn)的非蜂窩無線通信在社會(huì)生活中的重要使用,介紹了混頻器目前國內(nèi)外的研究現(xiàn)狀。然后詳細(xì)分析了吉爾伯特混頻器的轉(zhuǎn)換增益、噪聲、線性度以及提高這些性能的具體優(yōu)化技術(shù)。最后在此基礎(chǔ)上,采用TSMC 0.18um CMOS RF工藝完成了以下兩款下混頻器的設(shè)計(jì)與仿真:(1)研究了一種應(yīng)用于GPS衛(wèi)星導(dǎo)航的射頻前端下混頻器。該電路主要是通過采用派生項(xiàng)疊加技術(shù)、改進(jìn)型動(dòng)態(tài)電流注入技術(shù)、RC網(wǎng)絡(luò)負(fù)載技術(shù)來提高混頻器的線性度和降低噪聲。本設(shè)計(jì)工作于GPS L1頻段1.575GHz,電路的前仿真結(jié)果為:在1.8V供電電壓下,轉(zhuǎn)換增益為13,1dB,輸入三階交調(diào)點(diǎn)(ⅡP3)為4.4dBm,噪聲系數(shù)為7.45dB,電路功耗為7.2mW。(2)研究了一種適用于2.4G WLAN CMOS高線性度下混頻器。該設(shè)計(jì)創(chuàng)新了一種第三階跨導(dǎo)系數(shù)修正電流鏡對(duì)電路,有效的改善混頻器的線性度,而且增加了設(shè)計(jì)的自由度;采用電流注入技術(shù)來提高開關(guān)級(jí)的噪聲性能:源極電感反饋進(jìn)行射頻端口的輸入匹配,同時(shí)還提高混頻器的線性度。該電路工作在1.8V電壓下,前仿真結(jié)果為:電壓轉(zhuǎn)換增益14.6dB,輸入三階交調(diào)點(diǎn)(ⅡP3)達(dá)到12.69dBm,噪聲系數(shù)為7.13dB,電路的功耗小于8 mW。
[Abstract]:With the rapid development of wireless communication network, higher requirements for the performance of wireless communication equipment are put forward. The high performance radio receiver RF front-end is urgently needed in the RF receiver front end. Mixer is a key module, its linearity determines the dynamic range of the whole receiver, so the study of high linearity mixer has become the focus of RF receiver system. With the increase of dynamic range of mixer, the DC power consumption of mixer also increases. So how to improve the linearity of mixer on the basis of low power consumption while taking into account other performance. This paper first describes the important use of GPS satellite navigation and WLAN 802.11b / g standard non-cellular wireless communication in social life. This paper introduces the current research situation of the mixer at home and abroad, and then analyzes the conversion gain, noise, linearity and the specific optimization techniques to improve the performance of the Gilbert mixer in detail. Using TSMC 0.18um CMOS RF process to complete the design and simulation of the following two models of mixer: 1). A RF front-end mixer used in GPS satellite navigation is studied. The improved dynamic current injection technique and RC network load technology are used to improve the linearity and reduce the noise of the mixer. This design works at 1.575GHz in the GPS L1 band. The simulation results are as follows: at 1.8V supply voltage, the conversion gain is 131dB, the input third-order alternating point (鈪，

本文編號(hào)：1393306