【资料名称】：MTK校准过程

【资料作者】：buzhi

【资料日期】：buzhi

【资料语言】：中文

【资料格式】：DOC

【资料目录和简介】：

AFC的校准
2005-1-25 16:11:01 ID = 0
2005-1-25 16:11:03 Agilent 663x2 ok < initialize (init)
2005-1-25 16:11:03 Agilent Equipment < initial successfully

2005-1-25 16:11:03 =============== Write initial value to flash begin ===============
2005-1-25 16:11:03 TimerCal->Enabled -1= 0
2005-1-25 16:11:03 Target < Write path loss to NVRAM
2005-1-25 16:11:03 TimerCal->Enabled -2= 0
2005-1-25 16:11:03 Target< Write AFC value to NVRAM（写入初始值，比如scorpio的是4672）
2005-1-25 16:11:03 ================ Write initial value to flash end ================


2005-1-25 16:11:03 ==================AFC calibration begin =====================
2005-1-25 16:11:03 Agilent 8960< Band = EGSM band（设置仪器）
2005-1-25 16:11:03 Agilent 8960< BCH ARFCN = 70
2005-1-25 16:11:03 Agilent 8960< cell power = -60
2005-1-25 16:11:03 Target < ARFCN = 70, dac value = 4000, gain = 200, testing number = 10
2005-1-25 16:11:03 TimerCal->Enabled 2= 0
2005-1-25 16:11:04 TimerCal->Enabled 3= 0
26MHz VC-TCXO的AFC校准过程
1）按照上面写入的初始值DAC1＝4672，测量手机的频率f1；
2）在DAC1的上面加上一定的步长得到DAC2，测量手机频率f2；
3）计算斜率Slope，公式如下

根据Slope算出26M对应的DAC值，校准结束。
2005-1-25 16:11:04 ==============AFC calibration end ======================

2005-1-25 16:11:04 ==============AFC calibration check begin ================
对根据Slope得到的值进行测试，此例得到的是DAC值是4395，Slope是2.77399，下面将对这两个结果检测看是否在目标范围之内，包括
4000<DAC<5000, 1<Slope<4，Fe<20Hz
2005-1-25 16:11:04 PASS: AFC slope check . AFC = 2.7739999294281 min AFC slope = 1.0, max AFC slope = 4.0
2005-1-25 16:11:04 PASS: AFC initial DAC value check . AFC = 4395, min AFC initial DAC value = 2000, max AFC initial DAC value = 7000
结果符合要求，写入flash，
2005-1-25 16:11:04 Target> default value = 4395
2005-1-25 16:11:04 Target> slope inv = 1476
2005-1-25 16:11:04 TimerCal->Enabled 4= 0
2005-1-25 16:11:04 Target< Write AFC value to NVRAM
2005-1-25 16:11:04 Target< Write AFC value to NVRAM
2005-1-25 16:11:04 ===============AFC calibration check end ====================
2005-1-25 16:11:04 Target < Set AFC DAC = 4395


2005-1-25 16:11:04 ================Path loss calibration begin ===================
接收信道补偿的校准
2005-1-25 16:11:04 Agilent 8960< band = EGSM
2005-1-25 16:11:05 Agilent 8960< BCH ARFCN = 15
2005-1-25 16:11:05 Agilent 8960< Power = -60
2005-1-25 16:11:05 Target < PM : ARFCN = 15, sample per frame = 4, gain = 200, frames = 5
2005-1-25 16:11:05 TimerCal->Enabled 1= 0
2005-1-25 16:11:05 Target > power= -486
2005-1-25 16:11:05 delta L = 6

2005-1-25 16:11:05 Agilent 8960< BCH ARFCN = 30
2005-1-25 16:11:05 Agilent 8960< Power = -60
2005-1-25 16:11:05 Target < PM : ARFCN = 30, sample per frame = 4, gain = 200, frames = 5
2005-1-25 16:11:05 TimerCal->Enabled 1= 0
2005-1-25 16:11:05 Target > power= -488
2005-1-25 16:11:05 delta L = 8

2005-1-25 16:11:05 Agilent 8960< BCH ARFCN = 45
2005-1-25 16:11:05 Agilent 8960< Power = -60
2005-1-25 16:11:05 Target < PM : ARFCN = 45, sample per frame = 4, gain = 200, frames = 5
2005-1-25 16:11:05 TimerCal->Enabled 1= 0
2005-1-25 16:11:05 Target > power= -490

















ADC的校准
1）根据原理图，对于ADC的校准主要利用了ADC0和ADC3这两个模数转换通道（分别对应电池VBAT和Charge端，其余两个通道的值校准后直接用ADC0的校准参数，不单独做校准。
2）校准的过程：先控制电源供电电压分别为3.4V和4.2V，则可以得到两个对应的ADC值，根据这两组值分别计算出ADC0和ADC3的slop和offset值，知道了slop值和offset值，就可以得到每个输入电压的值。
3）准后的检测：主要检测slop和offset值是否超出范围，还有ADC current limit check
和ADC voltage limit check 两项功能，分别检测通过电阻RESISTANCE的电流，还有在ADC0和ADC3之处得到的电压差。
4）通过检测后就可以把校准参数写到手机里了。
2005-1-25 16:18:36 ================ADC calibration begin =====================
2005-1-25 16:18:36 set Agilent 663x2 set vlotage = 3.4
2005-1-25 16:18:36 set Agilent 663x2 measure vlotage = 3.41122
2005-1-25 16:18:36 BATTERY_ADC_Output[0] = 625.948974609375
2005-1-25 16:18:36 CHARGER_ADC_Output[0] = 624.679016113281
2005-1-25 16:18:36 set Agilent 663x2 set vlotage = 4.2
2005-1-25 16:18:36 set Agilent 663x2 measure vlotage = 4.21372
2005-1-25 16:18:36 BATTERY_ADC_Output[1] = 774.361022949219
2005-1-25 16:18:36 CHARGER_ADC_Output[1] = 772.705017089844
2005-1-25 16:18:36 BATTERY_ADC_Slope = 5407
2005-1-25 16:18:36 BATTERY_ADC_Offset = 26562
2005-1-25 16:18:36 CHARGER_ADC_Slope = 5421
2005-1-25 16:18:36 CHARGER_ADC_Offset = 24620
2005-1-25 16:18:36 Start writting ADC slope and offset to flash
2005-1-25 16:18:37 Target< Write ADC slope and offset to flash ok
2005-1-25 16:18:37 =================ADC calibration end ======================

2005-1-25 16:18:37 ===============ADC current limit check begin =================
2005-1-25 16:18:37 BATTERY_ADC_Output[2] = 774.306030273438
2005-1-25 16:18:37 BATTERY_ADC_Predict_Voltage = 4.21323490142822
2005-1-25 16:18:37 CHARGER_ADC_Output[2] = 772.708984375
2005-1-25 16:18:37 CHARGER_ADC_Predict_Voltage = 4.21347522735596
2005-1-25 16:18:37 PASS : ADC calibration check current difference, difference = 0.000600814819335938
2005-1-25 16:18:37 ==============ADC current limit check end ===================

2005-1-25 16:18:37 ==============ADC voltage limit check begin =================
2005-1-25 16:18:37 set Agilent 663x2 set vlotage = 3.6
2005-1-25 16:18:37 set Agilent 663x2 measure vlotage = 3.61138
2005-1-25 16:18:37 BATTERY_ADC_Output[2] = 662.25
2005-1-25 16:18:37 BATTERY_ADC_Predict_Voltage = 3.6073477268219
2005-1-25 16:18:37 CHARGER_ADC_Output[2] = 660.859985351563
2005-1-25 16:18:37 CHARGER_ADC_Predict_Voltage = 3.60714197158813
2005-1-25 16:18:37 Pass : ADC calibration check battery channel vlotage difference = 0.00403237342834473

2005-1-25 16:18:37 Pass: ADC calibration check slope and offset . BATTERY ADC slope = 5407
min battery ADC slope = 5250
max battery ADC slope = 5550

2005-1-25 16:18:37 ===============ADC voltage limit check end =================
2005-1-25 16:18:39 set Agilent 663x2 set vlotage = 3.8
手动校准ADC
1）先校准ADC0通道，先在[Point1]输入3400，并把电源电压设置成3.4V，按下[START]，
可以看到软件将计算出ADC值641.7；然后在[Point2]输入4200，设置电源并按下[START]；将看到软件计算出的SLOP和OFFSET结果，然后再按[APPLY]把这两个参数写到ADC0去，其他ADC1和ADC2用的值跟ADC0一样，不再单独校准。
2）再校准ADC3，方法同ADC0一样，最后把参数写到手机。










The following is a template format of configuration file.
[8960 Initialization]
8960 GPIB Address = GPIB0::15::INSTR
Time Out = 5000
GSM400 cable loss = -1.0
GSM850 cable loss = -1.0
GSM900 cable loss = -1.0
DCS1800 cable loss = -1.5
PCS1900 cable loss = -1.5
;”8960 GPIB Address” is GPIB address of Agilent 8960.
;”GSM900 cable loss” is cable loss between Agilent 8960 and MS at GSM900 bank.
[Frequency Bank] // specify the band supported by MS
bank = 0x1C
; GSM450 0x01
; GSM850 0x02
; GSM900 0x04
; DCS1800 0x08
; PCS1900 0x10
; The meaning of “0x1C” is that META will do GSM900, DCS1800 and PCS1900 bank auto calibration.
[C0 for each Bank] //specify the TX level testing ARFCN for each bank
arfcn_C0_GSM = 60
arfcn_C0_DCS = 750
arfcn_C0_PCS = 660
;Channel number for GSM, DCS and PCS bank.
[Downlink power] //specify the downlink cell power used in testing
P_DL = -60
[RX measurement samples] //specify the parameter for PM testing
N_PM = 5
M_PM = 4
; refer to section 3.2.1 for the limitation N_PM * M_PM <=2000
; N_PM is testing frames number of RX
; M_PM is samples per frame. Max value is 4.
[RX path loss table]
GSM900_MAX_RX_LOSS = 5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.0000,
GSM900_MIN_RX_LOSS = -5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.0000,
; GSM900_MAX_RX_LOSS is the maximum limitation of GSM900 RX path loss
; GSM900_MIN_RX_LOSS is the minimum limitation of GSM900 RX path loss
DCS1800_MAX_RX_LOSS = 5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.0000,
DCS1800_MIN_RX_LOSS= -5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.0000,
; DCS1800_MAX_RX_LOSS is the maximum limitation of DCS1800 RX path loss
; DCS1800_MIN_RX_LOSS is the minimum limitation of DCS1800 RX path loss
PCS1900_MAX_RX_LOSS = 5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.000,5.0000,
PCS1900_MIN_RX_LOSS= -5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.000,-5.0000,
; PCS1900_MAX_RX_LOSS is the maximum limitation of PCS1900 RX path loss
; PCS1900_MIN_RX_LOSS is the minimum limitation of PCS1900 RX path loss
[AFC Calibration] //specify the AFC testing paramter
N_AFC = 5
DAC1=4000
DAC2=4500
; N_AFC is testing frames number of AFC
[AFC table]
MAX_INIT_AFC_DAC = 65535
MIN_INIT_AFC_DAC = 0
MAX_AFC_SLOPE = 5.000
MIN_AFC_SLOPE = 0.000
; MAX_INIT_AFC_DAC is the maximum limitation of initial AFC DAC value
; MIN_INIT_AFC_DAC is the minimum limitation of initial AFC DAC value
; MAX_AFC_SLOPE is the maximum limitation of AFC slope
; MIN_AFC_SLOPE is the minimum limitation of AFC slope
[TX PCL table] //specify TX level specification
GSM900_CAL_PCL = 17, 12, 5,
; Calibrated PCL of 3 point PCL calibration
GSM900_PCL = 19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,
; Calibrated PCL of full PCL calibration
GSM900_CHECK_PCL = 19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,
; Specify the PCL need to be check when do APC calibration check
GSM900_MAX_P = 5.5, 7.5, 9.5,11.5,13.5,15.5,17.5,19.5,21.5,23.5,25.5,27.5,29.5,31.5,32.8,
; MAX power level
GSM900_WANTED_P = 5.0,7.0,9.0,11.0,13.0,15.0,17.0,19.0,21.0,23.0,25.0,26.7,28.7,30.2,32.2,
; Idea power level for each PCL
GSM900_MIN_P = 5,7,9,11,13,15,17,19,21,23,25,26.5,28.5,30,31.5,
; Min power level
GSM900_C = 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
; A weighted value is used for TX power level calibration. Please refer to section 4.2.4.
GSM900_CORRECTION = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
; Correction using when doing 3 PCL calibration
DCS1800_CAL_PCL = 13, 8, 1,
DCS1800_PCL = 15,14,13,12,11,10, 9, 8, 7, 6, 5,4,3,2,1,0,
DCS1800_CHECK_PCL = 15,14,13,12,11,10, 9, 8, 7, 6, 5,4,3,2,1,0,
DCS1800_MAX_P = 1, 2.5, 4.5,6.5,8.5,10.5,12.5,14.5,16.5,18.5,20.5,22.5,24.5,26.5,28.5,29.8,
DCS1800_WANTED_P = 0.5,2.5,4.5,6.5,8.5,10.0,12,14,16,18,20,22,24,25.5,27.5,29.2,
DCS1800_MIN_P = 0,2,4,6,8,10,12,14,16,18,20,22,24,25,27,28,
DCS1800_C = 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,
DCS1800_CORRECTION = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
PCS1900_CAL_PCL = 13, 8, 1,
PCS1900_PCL = 15,14,13,12,11,10, 9, 8, 7, 6, 5,4,3,2,1,0,
PCS1900_CHECK_PCL = 15,14,13,12,11,10, 9, 8, 7, 6, 5,4,3,2,1,0,
PCS1900_MAX_P = 0.5, 2.5, 4.5,6.5,8.5,10.5,12.5,14.5,16.5,18.5,20.5,22.5,24.5,26.5,28.5,30.5,
PCS1900_WANTED_P = 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,
PCS1900_MIN_P = -0.5,1.5,3.5,5.5,7.5,9.5,11.5,13.5,15.5,17.5,19.5,21.5,23.5,25.5,27.5,29.5,
PCS1900_C = 1,2,2,3,4,5,7,9,10,13,13,13,14,14,15,20,
PCS1900_CORRECTION = 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
TSC = 5
Recursive Times = 5 ; the maximum times to calibrate one power level
APC Delta = 0.1 ; if power level is in the range of (wanted power level – APC delta, wanted power level + APC
delta), jump to calibrate next power level
; TSC is the cell TSC value in Agilent 8960
; WANTED_P is wanted power in dBm for corresponding PCL
; MAX_P is MAX limitation power in dBm for corresponding PCL
; MIN_P is MIN limitation power in dBm for corresponding PCL
; C is a weighted value used for TX power level calibration. Please refer to section 4.2.4.
; MAX_P, WANTED_P, MIN_P and C can be integer or floating point.
[ADC table]
ADC_V1 = 3400
ADC_V2 = 4200
ADC_CHECK_VOLTAGE = 3600
NORMAL_VOLTAGE = 3800
MAX_BATTERY_ADC_SLOPE = 5300.0
MIN_BATTERY_ADC_SLOPE = 5100.0
MAX_BATTERY_ADC_OFFSET = 100000000
MIN_BATTERY_ADC_OFFSET = 0
BATTERY_CHANNEL = 0
CHARGER_CHANNEL = 3
ADC_RESISTANCE = 0.33
MAX_VOLTAGE_DIFFERENCE = 0.04
MAX_CURRENT_DIFFERENCE = 0.02
ADC_MEASUREMENT_COUNT = 1000
; ADC_V1 is the voltage of ADC calibration point 1, unit = mV
; ADC_V2 is the voltage of ADC calibration point 2, unit = mV
; ADC_CHECK_VOLTAGE is the voltage of ADC calibration voltage check, unit = mV
; NORMAL_VOLTAGE is the voltage of power supply after calibration finish, unit = mV
; MAX_BATTERY_ADC_SLOPE is the maximum limitation of battery ADC slope
; MIN_BATTERY_ADC_SLOPE is the minimum limitation of battery ADC slope
; MAX_BATTERY_ADC_OFFSET is the maximum limitation of battery ADC offset
; MIN_BATTERY_ADC_OFFSET is the minimum limitation of battery ADC offset
; BATTERY_CHANNEL is the first channel to do ADC calibration
; CHARGER_CHANNEL is the second channel to do ADC calibration
; ADC_RESISTANCE is the resistance when do ADC current limitation check
; MAX_VOLTAGE_DIFFERENCE is the maximum voltage difference between voltage of power supply and estimated voltage, unit = V
; MAX_CURRENT_DIFFERENCE is the maximum current difference, unit = A
; ADC_MEASUREMENT_COUNT is the ADC measurement count




并不是测量AFC，只是设AFC为低值时（AFC_LOW）,让手机强制发射，综测仪读取频率误差，然后再把AFC为高值时（AFC_high）,读频率误差，然后根据两点求直线来，算出AFC的斜率，AFC再调整频率误差时以这条直线为基准来调整。AFC一般线性非常好。

当AFC_LOW是在什么情况下的?感念不是很清楚.当时的频率误差是以那个频率为基准测得的?
但我看到MTK校准时,好多信道都要测试DAC,DAC与AFC是有直接关系的吧.
这个数摸转换值是这么读出来的?

要看AFC寄存器是几位的，假定是12位，AFC值最大就是2^12=4096。一般在正常情况下，AFC取中间值即2047时对应的频率误差最小，当AFC在2047的基础上变大或变小时，频率误差也随之变大。我们用直线来模拟AFC曲线时，一般去中间线性度最好的一段，即2047为中点的，两边各取等距的两点来计算。

DAC值不需要我们读出来，我要知道的只是AFC值和和频率误差，算出斜率即可。

AFC 主要是为了保证 Target 的时钟频率和网络正确同步。我们知道 DAC(数 模转换器)和 Frequency Offset(时钟频率偏移)有近似线性的关系，
DAC-Frequency Offset 曲线由两个要素决定，一个是基准值(nominal value)， 一个是曲线的斜率(slope)。所谓的基准值指的就是当 Frequency Offset 值为零时 DAC 的值，如果还知道 Slope 的值，就可以根据任何一个 Frequency Offset 计算出对应的 DAC 值了。
DAC 的值域和所用的芯片有关，TTPCom 提供的 Module 的 DAC 是用一个13 位的寄存器实现的，所以 DAC 的最小值为 0，最大值为 8191(213– 1)。

其实校准的原理并不复杂,校准方案也是大同小异.

比如用CMU200进行校准RX,是用非信令模式的generator发射一个射频信号(不同的方案可能会要求有一个小的频偏),该信号经过LNA放大,下变频,DGAIN或者AGAIN放大送入基带芯片进行解调.

需要掌握一个原则,就是一般要求解调信号电平为一个定值来达到最佳解调,校准的时候也要遵循这个原则.设置LNA.DGAIN.AGAIN的增益状态,调整CMU200的输出信号,当解调电平达到理想值的时候,就完成了一个等式:generator电平已知,解调电平已知,适当的设置上面的可调增益,就可以得到一组数据,也就是校准数据,这些数据记录了接收通路的状况,当接收通路设置不同的时候,这些数据就可以拿来当作参考,使控制器知道应该如何操作来达到最佳的信号接受.

•NVRAM Database file: 选择NVRAM数据库文件
Config file location: 校准配置文件
Calibration file location:校准参数文件
Test setup file location: 测试建立设置文件
Test report location:测试报告测试结果文件存放位置
Report database location:测试报告数据库文件位置