TDD噪聲的產(chǎn)生和解決方法

1、M1MTOC o 1-5 h z第一章TDD的概念11.1TDD的概念11.2TDD噪音的組成2第二章TDD噪音的表現(xiàn)形式22.1TDDnoise2第三章TDD噪音的產(chǎn)生原理2TDD噪音的主要產(chǎn)生途徑2TDD噪音產(chǎn)生原因-天線輻射2TDD-PA2第四章TDD噪音的測試條件3測試條件3第五章TDD噪音的問題定位3天線。3射頻：3MIC:3電源：45.5元器件本身質(zhì)量不好；4第六章TDD噪音的解決對策46.1對于一些輻射的處理思路46.2對于其他干擾的處理思路4RC4加電感磁珠5串電阻5META5PALDOPA5第七章TDD噪音的預(yù)防6第八章一些項(xiàng)目案例61項(xiàng)目68.22項(xiàng)目73項(xiàng)目84項(xiàng)目85項(xiàng)

2、目98.66項(xiàng)目9TDDM1MM1M1.1TDD的概念M個(gè)間隔21/8的時(shí)間在通話,而其余71.2TDD噪音的組成4.6毫秒1M2.MTDMA216.7H.zPAen52RD-wanghahaxiao-TDD52RD-wanghahaxiao-TDD頻率范圍為22.1TDDnoiseTDD噪音的表現(xiàn)形式是PA在發(fā)20,K21H6z.8eneo的聲音.TDD3.1TDD3.2TDD噪TDA3.3TDDPAEQawjjyjepgseooouj3Q0HEJ00NSk?300WQIA圍一晉一瀚商田颶理珂狂比ABVlI-W凹圉牌搜國削紀(jì)寸創(chuàng)即圧瞎僵圏一ABVLTKIPDUJA0丄？&1SODAWPX52

3、RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD6.152RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD6.1PA紋波、地彈，已經(jīng)強(qiáng)烈影響到Audio輸入的采樣部及reference.4.1測第四章TDD噪音3dMTDDnoieMTDDnoieM33dLNADC52RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD6.152RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD6.1章TDD噪MICPC時(shí)receiver25.1天線把射頻信號(hào)通過同軸線引入手機(jī)，看看

4、是否干擾消失。確定干擾是射頻天5.2射頻：一R強(qiáng)度有關(guān)，可以鏈接綜測儀，調(diào)節(jié)cel5.3MIC:ic會(huì)與receiver走線很近，如果是很長的receiicMIC5.4電源：通有無與receiv5.5元器件本PMICRCIR5.6結(jié)構(gòu)設(shè)計(jì)MICRCIRer2.2erTDD1要消除這些輻射源，可以2對于一些翻蓋滑蓋機(jī)型6.2對于其他干擾的處理RCC弗r空k1我們一般不選擇容值較大2我們用電容調(diào)試的方法目CCRR5電容濾C6.2.2加電1)加電LC52RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD6.1M-325A6.2.36.2.46.2.5TDMAREEER

5、METAPA電源濾波LDOPATDD濾波總結(jié)TDD50Hz-2EMEMRPLLDDRDRAMRAML除干擾的角度看，磁珠是比電感要好，但磁珠在2PEAPEA52RD-wanghahaxiao-TDD52RD-wanghahaxiao-TDD6.1bcd，mic的偏置電源、地要保護(hù)好；audioe,receiverAMPCPU.freceiverGNDg,差分線上的干擾信號(hào)可以表示為一個(gè)共模干擾部分+h關(guān)于接地器件之間殼體之間走線之中地一定要充I,VBAT不要形成環(huán)路不要干擾音頻等線音頻線處理好J預(yù)留濾波網(wǎng)絡(luò)k,PIAMIC8.11項(xiàng)目8.1.1問題現(xiàn)象RCIVR8.1.2問題分析PCB8.1.

6、3解決方法8.1.4總結(jié)PCBAUTCD52RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD222項(xiàng)目2.現(xiàn)1象TDD22TDDTDDTDD2.處3理方法R入8.3分.析2R地52RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD25.分2析52RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD2562改朮JaIJsIJi-

7、1Je|je|.yIJ.3|js|jj.jo|包Ibcrovcsje沁52352583308338M於366303相E133杞包曲82e5/H即VbCDC0史?。捍鏒晌VbDDCOWe(:0VbC心加環(huán)I陽顯：0VHLCH：0Q陽“HAhvhqggpg餡匚：小皿門山egguqa印聞e內(nèi)山!u岡舊障里/sv30J廠匚飛7-oroaoiSi_(*蕙)/sv30J廠匚飛7-oroaoiSi_(*篦Lsenaoode3jSoobtJaoocen020be52RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD252RD-wanghahaxiao-TDD2TDD52RD-wanghahaxiao-TDD52RD-wanghahaxiao-TDD28.6總.結(jié)2：TDD做到最后主要就是接地因?yàn)闊o論是數(shù)字信號(hào)還是模擬信號(hào)最后都要接到手機(jī)的系統(tǒng)只采用一個(gè)參考面。相反，如果系統(tǒng)存在兩個(gè)參考面，就可能形成一個(gè)偶極天線（