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使用MT6225+MT6139BN PA : RPF08155B
在这一批板子(〉1000)中出现了2pcs TX DC_offset error,请帮忙分析一下具体可能存在的原因,谢谢
校准LOG:
===========TX IQ Cal Start===============
TrimI =0,TrimQ =0,SBS =-38.306590,PSBS =0.000148
OffsetI ==0,OffsetQ =0,OOS =-40.241320,POOS =0.000095
TrimI =7,TrimQ =-7,SBS =-34.499820,PSBS =0.000355
OffsetI ==0,OffsetQ =30,OOS =-29.978620,POOS =0.001005
TrimI =-7,TrimQ =7,SBS =-32.213790,PSBS =0.000601
OffsetI ==30,OffsetQ =-30,OOS =-24.575780,POOS =0.003487
OffsetI ==-30,OffsetQ =-30,OOS =-26.037480,POOS =0.002490
Evaluate Xt = 2.61,TrimI = 1,TrimQ = -2
Evaluate OffsetI = -6,OffsetQ = 4
d_OOS_Check = -53.22,d_SBS_Check = -38.72
TX IQ Imblance Fail,MAX Imblance:-40.000000
d_SBS_Check = -38.72 这一项不过,正常的值在-46左右。
更换过26M晶体和MT6139都没有作用。但是在刚焊完元器件,板子很烫的时候能过,不过值也在-41左右。冷却后有和原来一样。 |
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