手机校准测试

江东桑田路722弄12号东方电子有限公司三楼林莉

明天上午8:50

1.手机校准测试

我只知道要进行发射功率\AFC\AGC的校准,此外还必须进行校准的内容有哪些?

2.校准的原理\算法是怎样的?

3.选择哪些信道\功率级校准?

4.除这些RF部分之外还有哪些关于电性能方面的校准测试?

1。手机校准主要是针对RF参数的校准，比如你提到的AFC、APC、AGC，另外，还有电池ADC 的校准、温度校准，要看不同平台的要求，校准的项目也不同，但是大体相同。

2。校准的简单原理就是：由于器件不一致、温度变化、器件老化等因素的影响，即使是基于同样的平台同样的设计，也会表现出不同的电性能。为了消除这种影响，每个手机在出厂之前都要对这些参数进行测量计算得到一些参数误差数据，并把这些误差数据存储到一定的存储介质（一般为EEPROM）里，在手机正常使用过程中，CPU会读取这些数据并利用一定的算法对需要补偿的参数进行补偿。在生产测试过程中，对需要补偿校正的数据测量计算并存入EEPROM里的过程，称之为校准。

3。校准的算法：每个平台都不一样，各有各的算法，但是大体的方法都是和仪器进行交互，利用仪器测量的一些数值调整DAC或ADC的参数，把这些参数存成表存储到EEPROM里。具体到某个指标的算法，要根据平台提供上的建议，另外，编程序的时候还有些技巧和算法使得程序高效快速。

EMS---电子制造服务商

EMS:Electronics Manufacture Services

ODM---电子设计制造商

ODM:Original Design Manufacturer

CEM---电子合约制造商

OEM:Original Equipment Manufactures

手机测试时用到的一些名

AB Access Burst

AFC Automatic Frequency Control

AGC Automatic Gain Control

AGCH Access Grant Channel

ARFCN Absolute Radio Frequency Channel

Number

BCC Base station Color Code

BCCH Broadcast Control Channel

BCH Broadcast Channel

BER Bit Error Rate

BFI Bad Frame Indication

BS Base Station

CC Country Code

CCCH Common Control Channel

CRC Cyclic Redundancy Check

DNLK Downlink

DCS Digital Communication System

DTMF Dual Tone Multi-Frequency

DRX Discontinuous Reception

DTX Discontinuous Transmission

FACCH Fast Associated Control Channel

FACCH/F Full-rate FACCH

FACCH/H Half-rate FACCH

FCH Frequency Correction Channel

FDMA Frequency Division Multiple Access

FER Frame Erasure Rate

GB Guard Bits

GMSK Gaussian Minimum Shift Keying

GSM Global System for Mobile Communication

IF Intermediate Frequency

IMEI International Mobile station Equipment Identity

IMSI International Mobil Subscriber Identity ISDN Integrated Services Digital Network

I/Q In-phase and Quadrature

LAC Location Area Code

LAI Location Area Identity

LAN Location Area Network

MCC Mobile Country Code

MMI Man Machine Interface

MNC Mobile Network Code

MS Mobile Station

NB Normal Burst

PCH Paging Channel

PCS Personal Communications System

PIN Personal Identification Number

PLMN Public Land Mobile Network

PRBS Pseudo Random Binary Sequence

RAB Random Access Burst

RACH Random Access Channel

RBER Residual Bit Error Rate (BER after errored frames removed)

RF Radio Frequency

RFC Radio Frequency Channel

RFCH Radio Frequency Channel

RX Receiver

RXLEV Received Signal Level

RXQUA

L

Received Signal Quality

SACCH Slow Associated Control Channel

SB Synchronization Burst

SCH Synchronization Channel

SDCCH Stand Alone Dedecated Control Channel

SIM Subscriber Identification Module

SMS Short Message Service Support

SMSCB Short Message Service Cell Broadcast

SN Subscriber Number

TB Tail Bits

TCH Traffic Channel

TCH/F Full rate TCH

TCH/H Half rate TCH

TCH/FS Full rate Speech TCH

TCH/HS Half rate Speech TCH

TDMA Time Division Multiple Access

TMN Telecommunication Management Network

TN Timeslot Number

TS Time Slot

TX Transmitter

UPLK Uplink

按照GSM系统理论，手机的接收比发射超前3个时隙(大约为18ms)，是手机找系统而不是系统找手机，接收决定发射，也就是说手机是先接收后发射。这是手机的入网原理