MTK平台硬件培训(非常好).ppt

MTK 平台硬件培训编辑:池楚藩 CKT 射频电路部 0755-26737110 chufan.******@ck- Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 1 MTK 平台 GSM 双频手机接收信号处理流程匹配及天线开关接收射频滤波 SAW 925~960MHz for GSM 1805~1880MHz for DCS 射频低噪声放大 LNA 39dB 可选接收镜像抑制 RF 混频 RF Mixer RF VCO Fvco = 2Fch - 200k for GSM Fvco = Fch - 100k for DCS 一本振锁相环 PLL 接收中频滤波 IF=100kHz 带宽: 200kHz 接收中频放大滤波增益可编程: 78dB 2dB step IF 混频、 I/Q 解调- > 模拟 I/Q 信号模拟基带 I/Q 信号滤波模拟基带信号 A/DC 及滤波 GMSK 解调、维特比信道均衡、解密、去交织、信道解码语音解码: RPE-LTP 解压缩、数字音频滤波、 D/AC 模拟音频放大滤波基带部分部分射频数字信号处理部分分频器 EN DA CLK VCXOEN 26MHz 参考时钟 RFVCOEN I Q Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 2 MTK 平台 GSM 双频手机发送信号处理流程模拟音频放大、滤波 AD/C 模数变换及数字音频滤波话音压缩编码 RPE-LTP : 13kbps 信道编码、交织、加密、突发脉冲形成、 GMSK 调制?模拟基带 I、Q信号 I/Q 调制/发射中频滤波发射偏移上变频锁相环 OPLL TXVCO 880~915MHz for GSM 1710~1785MHz for DCS 发射功率放大天线开关:切换收/发基带部分部分射频数字信号处理部分 VAPC PA_EN BS RF 锁相环 PLL RFVCO 26MHz 参考时钟 EN DA CLK RFVCOEN 分频移相发射混频 LB_TX HB_TX Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 3 硬件电路原理-射频 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 4 硬件电路原理-射频-前端开关 GSM 发射控制 DCS/PCS 发射控制 PCS 接收控制射频前端开关电路用于切换 GSM/DCS/PCS 的接收和发射,并抑制发射信号的带外杂散 Evaluation only. Evaluation only. Created with Client Profile . Created with Asp