MTK平台，WCDMA BC5功率上不去！求解

13641946114 · 发表于 2012-11-12 10:26:40

各位同仁：
小弟，刚接触MTK平台，不懂META RF调试。目前遇到一个问题卡着了，请大虾不吝赐教！

情况：单校BC5 TPC时channel power 功率只有3.9DBM提不上去(详见下面log)，但META强发channel power约15DBM（BC5配置和BC1基本一致）；BC1是能校过的，BC1强发channel power也是约15DBM。
请问：以上问题怎么解？另外如果我用META以指定PA gain强发的话，要怎么操作？
人个看法：会不会是.CFG文件对8960的配置不合适8960里的W系统？因为强发功率是远远能超过3.9DBM的。因此我也试过8960中别的W系统，CMU也试过了。其它板子也试过了，属于一致性问题。
以下是CFG里的一段：
WCDMA_PA_MODE_CAL_NUM = 3
; 3 >= WCDMA_PA_MODE_CAL_NUM >= WCDMA_TPC_PA_MODE_SUBBAND_CAL_NUM >=1

BAND1_TPC_UARFCN_UL = 9750
BAND2_TPC_UARFCN_UL = 9400
BAND4_TPC_UARFCN_UL = 1412
BAND5_TPC_UARFCN_UL = 4183
BAND8_TPC_UARFCN_UL = 2787

BAND1_TPC_WANTED_P_OFFSET = -1
BAND2_TPC_WANTED_P_OFFSET = -1
BAND4_TPC_WANTED_P_OFFSET = -1
BAND5_TPC_WANTED_P_OFFSET = -1
BAND8_TPC_WANTED_P_OFFSET = -1
-----------------------------------------------------
BC5 LOG:
2012-11-9 16:21:21.812  ======= WCDMA TPC calibration begin (MT6162) ==============
2012-11-9 16:21:24.687 Agilent 8960 < Operation mode = WCDMA FDD
2012-11-9 16:21:24.687 Agilent 8960 < RMC 12.2Kbps mode
2012-11-9 16:21:24.687 Agilent 8960 < Power = -70.00000 dBm
2012-11-9 16:21:24.687 [Info] set Power Control Mode 0.
2012-11-9 16:21:27.984 Agilent 8960 < UARFCN UL = 4183
2012-11-9 16:21:28. 78 set runtime TX DAC parameter for calibration (zero compensation)
2012-11-9 16:21:28. 78 Cal Mode: 2 (1: first high mode 2: all sections)
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 24.500, 24.000, 23.500
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 22.500, 22.000, 21.500
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 20.500, 20.000, 19.500
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 18.500, 18.000, 17.500
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 15.500, 15.000, 14.500
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 11.500, 11.000, 10.500
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 6.500, 6.000, 5.500
2012-11-9 16:21:28. 78 [DEBUG]: CFG: 6.500, 0.000, -0.500
2012-11-9 16:21:28. 78  ----------  Low_PA_mode (WCDMA_BAND5)-------------
2012-11-9 16:21:28. 78 [Info] d_goal_power (-1.00) = 0.00 + -1.00
2012-11-9 16:21:28. 78 [Info] Initial PA gain: 296
2012-11-9 16:21:28.281 Agilent 8960 < initiate channel power measurement
2012-11-9 16:21:28.406 Agilent 8960 < fetch channel power = 3.94407
2012-11-9 16:21:28.421 [Info](1): set runtime PA gain:454
2012-11-9 16:21:28.656 Agilent 8960 < initiate channel power measurement
2012-11-9 16:21:28.781 Agilent 8960 < fetch channel power = 3.94059
2012-11-9 16:21:28.828 [Info](2): set runtime PA gain:612
2012-11-9 16:21:29. 62 Agilent 8960 < initiate channel power measurement
2012-11-9 16:21:29.218 Agilent 8960 < fetch channel power = 3.93727
2012-11-9 16:21:29.250 [Info](3): set runtime PA gain:769
2012-11-9 16:21:29.468 Agilent 8960 < initiate channel power measurement
2012-11-9 16:21:29.625 Agilent 8960 < fetch channel power = 3.93729
2012-11-9 16:21:29.640 [Info](4): set runtime PA gain:926
2012-11-9 16:21:29.875 Agilent 8960 < initiate channel power measurement
2012-11-9 16:21:30.  0 Agilent 8960 < fetch channel power = 3.93661
2012-11-9 16:21:30. 46 [Info](5): set runtime PA gain:1083
2012-11-9 16:21:30.281 Agilent 8960 < initiate channel power measurement
2012-11-9 16:21:30.437 Agilent 8960 < fetch channel power = 3.93821
2012-11-9 16:21:30.453 [Info](6): set runtime PA gain:1241
2012-11-9 16:21:30.671 Agilent 8960 < initiate channel power measurement
2012-11-9 16:21:30.828 Agilent 8960 < fetch channel power = 3.93642
2012-11-9 16:21:30.843 Warn: PA Gain (1280) exceed the max limit(1280), so set to max
2012-11-9 16:21:30.843 [Info](7): set runtime PA gain:1280

hanny · 发表于 2012-11-14 21:26:23

你最好设0, 仪器需要lincense

13641946114 · 发表于 2012-11-14 10:19:28

[WCDMA FHC Factory Settings]

; 0: linear, 1: cubic
FHC_WCDMA_MATH_MODE =1

哪位能解释一下这小段是干什么的？“FHC_WCDMA_MATH_MODE =1”是什么意思?

13641946114 · 发表于 2012-11-13 19:10:20

6楼专业

lizx30340 · 发表于 2012-11-13 10:45:51

你的PA GAIN从296变到1241，手机的输出功率都没有没多大变化，所以LOW PA MOD校准失败。正确的情况应该是，PA的输出功率随着PA GAIN增大要下降的，这个和你最大功率只有15db没什么关系。

plj357 · 发表于 2012-11-13 09:12:01

从log来看，LZ只是Low_PA_mode没有校准过去，自然也无法校准high以及mid_PA_mode

hanny · 发表于 2012-11-12 23:33:50

楼上的很专业!

wyzcl · 发表于 2012-11-12 20:01:11

wcdma中的的频段不能称为BC1,BC5,只能称为band1,band5.

这个是CDMA中的频段概念.如下:

Band Class 0 US Cellular
MS: 824.025 MHz – 848.985 MHz, BS: 869.025 MHz – 893.985 MHz
Band Class 1 North American PCS
MS: 1850 MHz – 1910 MHz, BS: 1930 MHz – 1990 MHz
Band Class 2 TACS Band
MS: 872.0125 MHz – 914.9875 MHz, BS: 917.0125 MHz – 959.9875 MHz
Band Class 3 JTACS Band
MS: 887.0125 MHz – 924.9875 MHz, BS: 832.0125 MHz – 869.9875 MHz
Band Class 4 Korean PCS
MS: 1750 MHz – 1780 MHz, BS: 1840 MHz – 1870 MHz
Band Class 5 NMT-450
MS: 411.675 MHz – 483.480 MHz, BS: 421.675 MHz – 494.480 MHz

ktyo1 · 发表于 2012-11-12 14:50:45

贴个INI出来看下？

13641946114 · 发表于 2012-11-12 11:02:48

BC5中ini文件的相关段落与BC1的基本一样（除了信道设置）

13641946114 · 发表于 2012-11-12 10:55:01

CFG里面相关段落:
WCDMA_TPC_DELTA = 0.5
WCDMA_TPC_POWER_DETECTOR_ERROR_RANGE =0.5

; specify the number of subband calibration by PA mode
; num = 1: PA High mode
; num = 2: PA High,Middle mode
; num = 3: PA High,Middle,Low mode
WCDMA_TPC_PA_MODE_SUBBAND_CAL_NUM = 3

; 0: absolute, 1: relative check
WCDMA_TPC_PWR_CHECK_MODE = 1
WCDMA_TPC_PWR_DELTA_FOR_RELATIVE_CHECK = 0.5

WCDMA_PA_MODE_CAL_NUM = 3
; 3 >= WCDMA_PA_MODE_CAL_NUM >= WCDMA_TPC_PA_MODE_SUBBAND_CAL_NUM >=1

BAND1_TPC_UARFCN_UL = 9750
BAND2_TPC_UARFCN_UL = 9400
BAND4_TPC_UARFCN_UL = 1412
BAND5_TPC_UARFCN_UL = 4183
BAND8_TPC_UARFCN_UL = 2787

13641946114 · 发表于 2012-11-12 10:33:59

补充一点：
原理图没问题，VMODE1/0 的配置应该没有问题，因为是和BC1是并联！BC1正常！实测值和SPEC也是一致的。

judas_sht · 发表于 2012-11-28 19:43:40

用的哪家的PA？
Mode改成linear可以校准了么？
楼主更新啊

wdslvhy · 发表于 2012-11-28 18:57:47

[WCDMA FHC Factory Settings]

; 0: linear, 1: cubic
FHC_WCDMA_MATH_MODE =1

哪位能解释一下这小段是干什么的？“FHC_WCDMA_MATH_MODE =1”是什么意思?
-----
--------OH use linear math mode in FHC,设为0吧

xuyuan1205 · 发表于 2013-1-4 01:18:39

<B>以下是引用<i>wdslvhy</i>在2012-11-28 18:57:47的发言：</B>
[WCDMA FHC Factory Settings]

; 0: linear, 1: cubic
FHC_WCDMA_MATH_MODE =1

哪位能解释一下这小段是干什么的？“FHC_WCDMA_MATH_MODE =1”是什么意思?
-----
--------OH use linear math mode in FHC,设为0吧

希望各位解释一下！谢谢！

snail2599 · 发表于 2013-2-26 12:41:42

这PA的功率随增益的变大而下降，有点儿扯了吧？是不是补偿值的原因？
用的PA是三级增益的吗？有时候PA 本身是两级增益的，但是还要要注意。

zhouyiming2012 · 发表于 2013-2-24 19:34:41

学习的不会

jackking2009 · 发表于 2013-2-24 15:46:01

2013-02-22 20:12:46.296 ---------- Low_PA_mode (WCDMA_BAND1)-------------
2013-02-22 20:12:46.296 [Info] d_goal_power (-1.00) = 0.00 + -1.00
2013-02-22 20:12:46.296 CMU 200 read TX power fail. Normal
【文件名】:13224@52RD_band1log.txt
【格　式】:txt
【大　小】:4K
【简　介】:
【目　录】:

jackking2009 · 发表于 2013-2-24 15:43:26

　　这个是我的一个板子BAND1的校准，是随着增益的变大，功率变小的。功放是RF7241,不过校准不过。我看mtk的文档上是增益变大，功率变大。比较疑惑，望解答。

2013-02-22 20:12:45.281 ================== WCDMA TPC calibration begin (MT6162) ===================
2013-02-22 20:12:45.281 CMU 200 read TX power fail. Normal[em01][em01][em01][em01]

jackking2009 · 发表于 2013-2-24 15:40:11

PA的输出功率随着PA GAIN增大要下降？mtk的文档里面怎么是随着增益变大，输出功率变大的。

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