《高通平台ILPC调试简析全解课件》由会员分享,可在线阅读,更多相关《高通平台ILPC调试简析全解课件(14页珍藏版)》请在金锄头文库上搜索。
1、高通平台ILPC调试简析Hardware departmentBy 陈国江2015-03-22015 Tinno Mobile All Rights Reserved一、高通平台power detect原理简析二、WCDMA ILPC调试三、总结一、高通平台power detect原理简析WTR1605 power detect框架通过ADC芯片来实现功率检测WTR1605功率检测机制的缺点1.精度差,调试出来的ILPC余量先天不足2.ILPC时没法对波形没有进行实时调整WTR4905 power detect框架用接收机来做PDET电路WTR4905功率检测机制的优点1.精度高2.ILPC时
2、对波形进行实时调整 During mission mode: power sampling, processing, and applied power correction occurs during the guard period between slots 。 Transient periods before and after each slot are not included in the power measurements 二、WCDMA ILPC调试影响ILPC的因素1.温度变化对功率的影响-TX LIN_VS TEMP-012.功率切换点的设置-R1_ RISE/FALL
3、3. 频率变化对功率偏差- pa_compensate_ down_R1_VS FREQ温补参数测试high gainlow gainTMPmeas(dBm)meas(dBm)diff(dBm)diff(ADC)055.0 22.35.7-2144.3 -1233.6 0322.9 22.57.60412.1 151.4 22.726-9.3 37-20.0 22.910.34功率切换点设置NV_WCDMA_R1_RISE=10*X+188频率补偿参数设置频率补偿的目的是为了保证低中高信道的ILPC能同时满足要求频率补偿-校准XTT设置总结温补参数、功率切换点和频率补偿3个参数是息息相关的,单独调试某一个参数不一定能完全解决问题,需要3个参数一起配合调试,而且这个调试的过程要参考多块主板来反复验证一致性