TX IQ问题求教

wozaijintian

用6223+6139+77518

2010-6-15 16:44: 7.968 ================ TX IQ calibration begin ==================
2010-6-15 16:44: 9.906CMU 200 < Band = EGSM
2010-6-15 16:44: 9.937CMU 200 < TCH ARFCN = 70
2010-6-15 16:44: 9.937CMU 200 < MS TX level = 5
2010-6-15 16:44: 9.937CMU 200 < TSC = 5
2010-6-15 16:44:10.593 TrimI = 0, TrimQ = 0, SBS = -5.852585, PSBS = 0.259861
2010-6-15 16:44:10.593 OffsetI = 0, OffsetQ = 0, OOS = -3.518707, POOS = 0.444764
2010-6-15 16:44:11.234 TrimI = 7, TrimQ = -7, SBS = -7.538803, PSBS = 0.176246
2010-6-15 16:44:11.234 OffsetI = 0, OffsetQ = 30, OOS = -4.709061, POOS = 0.338138
2010-6-15 16:44:12. 78 TrimI = -7, TrimQ = 7, SBS = -8.296021, PSBS = 0.148046
2010-6-15 16:44:12. 78 OffsetI = 30, OffsetQ = -30, OOS = -5.772614, POOS = 0.264691
2010-6-15 16:44:12.734 OffsetI = -30, OffsetQ = -30, OOS = -2.538574, POOS = 0.557369
2010-6-15 16:44:12.875 Evaluate Xt = 1.010072, TrimI = 1, TrimQ = 0
2010-6-15 16:44:12.875 Evaluate OffsetI = -47, OffsetQ = -19
2010-6-15 16:44:12.906 ================== TX IQ calibration end ==================
2010-6-15 16:44:12.906 ===================== TX IQ check begin ===================
2010-6-15 16:44:13.453CMU 200 < Band = EGSM
2010-6-15 16:44:13.484CMU 200 < TCH ARFCN = 70
2010-6-15 16:44:13.484CMU 200 < MS TX level = 5
2010-6-15 16:44:14.359 Target< Write TXIQ value to NVRAM
2010-6-15 16:44:14.359 FAIL: TX IQ calibration. , Check TX DC offset = -3.502029, Max TX DC offset = -40.000000

nanguahewupo

等待高手~~~

gook2009

同求……

wozaijintian

用示波器看了，打到发射的时候是有信号出来的，大概是1.3V左右的DC，很奇怪哦

pww6435

明显是DC OFFSET过大嘛，一般要求最大-40dbc左右……
不过DC一般不会那么大的，你先确认有没有信号先……

wozaijintian

顶，为何啊？苍天