RF校准软件设计.ppt

手机射频校准 什么是射频校准？ The process of obtaining RF parametric data to be used by the phone for the purpose of compensating for non-linear devices, frequency variations, and temperature variations Output from the calibration process is stored in non-volatile (NV) memory DMSS uses RF NV items during normal operation to ensure system performance is met. 射频校准的意义? (1) Subscriber units have differing RF characteristics. -Some characteristics vary from one unit to the next -Other characteristics vary from one design to the next 射频校准的意义? (2) The subscriber unit must estimate the Rx power properly to maximize signal to noise ratios and to provide a basis for Tx power output. The subscriber unit must transmit at correct Tx power level over its large dynamic range. 射频校准的意义? (3) The MSM device and system software combination must “know” the RF characteristics of the particular unit. This information is known as RF calibration data. Failure to compensate for differing RF characteristics may cause the unit to fail minimum performance specifications. 射频校准的意义? (4) Calibration Consideration: - Some NV Items will be static per phone design ? Ex: NV_CDMA_ENC_BTF - Other NV items will vary from one phone to the next and need to be calibrated ? Ex: NV_CDMA_TX_LIN_MASTER_1 射频校准的信号流图 射频校准工位搭建 NV项 Calibration compensates for nonlinear characteristics, and temperature and frequency variations in the performance of the Tx and Rx path components in a subscriber unit Output from the calibration process are stored in nonvolatile (NV) memory items in AMSS software DMSS software loads calibration values into MSM registers or uses them for software processing during normal DMSS operation NV items can be accessed using raw DIAG commands or using DIAG-based tools, such as the QPST RF Calibration Tool ? Some NV items will be static per the hardware design Other NV items will vary from one unit to the next Some elements within an NV item can be extrapolated NV项类型