gsm校准终测的基本原理（Fundamentals of GSM calibration measurements）.docVIP

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gsm校准终测的基本原理（Fundamentals of GSM calibration measurements）.doc

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gsm校准终测的基本原理（Fundamentals of GSM calibration measurements）

gsm校准终测的基本原理（Fundamentals of GSM calibration measurements） GSM mobile phone calibration and testing principle calibration In general, cell phone calibration consists of 4 parts: 1. ADC calibration It includes GPADC (General, purpose, analog, to, digital, converter) calibration and battery calibration. The GPADC is an analog to digital converter used to test external analog sources, which can be used to test battery voltage and temperature. GPADC calibration is a benchmark within the Greenstone calibration, so that the AD conversion accuracy is best. Battery calibration is on the GPADC, through the limit work measuring battery obtained between two points, slope, called battery sensor gain, can be obtained between the two points to the linear representation of voltage line, change to measure the actual battery voltage. 2. AFC calibration Includes crystal calibration and AFC gain calibration. Crystal calibration is to satisfy the phone when booting, the systems coarse frequency error is closest to 0. AFC gain calibration is to get a linear fine frequency tuning interval, when the mobile phone work, use this interval of gain to dynamically adjust frequency error. 3. AGC calibration AGC calibration is to calibrate the mobile phone receive link board insertion loss, so that the received power error is minimal. 4. APC calibration APC calibration includes PA profile calibration, PA offset calibration and PCL versus power calibration. PA profile calibration is the calibration of the phones emission curve, to meet the curve can cover the normal launch of mobile phones part of the hard work. PA offset calibration is to calibrate the low frequency and high frequency emitted by the phone, through this offset to low, frequency and high frequency power error when the offset unified compensation. PCL versus power calibration, that is, you can change the size of the PCL corresponding transmit power. For example, when normal, PCL = 5 corresponding emission power should be about 33dBm