手机的工作原理解剖.ppt

手機的工作原理( RF Baseband ) 手機結構 一部移动电话包括无线接收机(Receiver)、发射机(Transmitter)、控制模块(Controller)及人机界面部分(Interface)和电源(Power Supply)。 從印刷板電路大體可分為 射頻基帶兩個部分。 以hutch 手機為例 一﹑射頻部分 ( R F ) 1.接收部分 1.接收機電路原理分析 由天線接收下來的高頻信號進入N7700在VC1VC2VC3的控制下輸出GSMRX DCSRX信號其中GSMRX信號經SAW Z7602濾波后送給中頻IC N7600 的29 30腳DCSRX信號經SAW Z7600濾波后送到N7600 的34 35腳。GSMRX DCSRX 信號在N7600里面進行低噪聲放大與本振信號進行混頻﹐混頻后的信號經濾波 自動增益放大后解調出接收IQ信號RXI RXQ分別送給UEM的F13 F14 G13 G14腳RXI RXQ在UEM經過A/D轉換 解調形成接收數字信號RXID RXQD.從其C11 C14腳輸出﹐送入UPP的R5與N7腳在UPP里面進行信道解密﹐解碼﹐去交織形成數字語音信號 EARDATA.從UPP的F2腳輸出送入UEM的B6腳在UEM里解碼﹑D/A轉換﹑音頻放大后從P11 P12輸出。 2.發射機部分原理分析 MIC把語音信號進行聲電轉﹐轉換后的語音信號在UEM進行音頻放大﹐A/D轉換編碼后形成數字語音信號MICDATA送入UPP﹐在UPP內部進行交織﹑加密﹑信道編碼形成發射數字信號TXID TXQD.送到UEM進行調制D/A轉換﹐形成TXIP TXIN TXQP TXQN送到中頻IC N7600與本振信號混頻﹐混頻后的發射經過自動增益放大﹐形成最終的發射信號TX1 TX1X TX2 TX2X 經過濾波后送入PA進行功率放大 二﹑基帶部分 (Baseband) 1.專業朮語的解釋 2.Baseband board clocks 3.Baseband signal 4.UEM regulator outputs 5.手機的几種工作狀態 baseband has six different operating modes No Supply Power off Acting Dead Active Sleep Charging No supply In No Supply mode, the phone has no supply voltage. This mode is due to disconnection of main battery or low battery voltage level.Phone is exiting from No Supply mode when sufficient battery voltage level is detected. Battery voltage can rise either by connecting a new battery with VBAT Vmstr+ or by connecting charger and charging the battery above Vmstr+. Power off In this state the phone is powered off, but supplied. VRTC regulator is active (enabled) having supply voltage from main battery. Note, the RTC status in PWR_OFF mode depends on whether RTC was enabled or not when entering PWR_OFF. From Power off mode UEM enters RESET mode (after 20ms delay), if any of following statements is true (logical OR –function): – Power on button detected (PWROFFX) – charger connection detected (VCHARDET) The Phone enters POWER_OFF mode from all the other modes except NO_SUPPLY if internal watchdog elapses. Acting Dead If the phone is off when the