高通RF_Calibration_介绍.pptVIP

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2018-05-19 发布于四川
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高通RF_Calibration_介绍.ppt

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RF Calibration Introduction Agenda What is RF calibration. Why calibration. NV items of RF calibration. Rx Calibration. Tx Calibration. What is RF calibration What is RF calibration Setup: Why calibration Subscriber units have differing RF characteristics Differences in design Part-to-part variations of components of the same design Why calibration Individual phones also change their own RF characteristics: over frequency channel over temperature Why calibration NV items of RF calibration The compensation values are classified: Static RF NV items: Measured once per design. Calculated RF NV items: RF NV items that are calculated based on other parameters of the design configurations. Measured RF NV items: Is determined by the RF calibration process. Rx calibration Philosophy of Rx AGC(Automatic Gain control) loop. DVGA(Digital VGA) offset calibration. LNA(Low Noise Amplifier) offset calibration. Rx calibration (Rx AGC loop) Rx calibration (DVGA offset) Philosophy of Rx DVGA offset calibration: Rx calibration (LNA offset) Philosophy of Rx LNA offset calibration: Rx calibration (LNA offset) Tx calibration Philosophy of Tx AGC(Automatic Gain control) loop. Tx Linearizer Tx Compensation HDET (High power detector) Tx calibration (AGC Loop) Tx calibration (AGC Loop) Tx calibration (Tx AGC Characteristic) Tx calibration (Tx Linearizer) Tx calibration (TX_GAIN_CTRL.) Tx calibration (HDET Feedback loop op.) Tx calibration (Tx Comp.) Tx calibration (Tx Comp.) Tx calibration (Tx HDET) Tx calibration (Tx HDET) Tx calibration (Tx HDET) * ? RF calibration is the process of measuring data to be used in the system for the purpose of compensation of non-linear characteristics and frequency variations, and to provide absolute power reference and temperature compensation to ensure performance of the Tx and Rx paths of a subscriber unit. ? Output from the calibration process is stored in non-volatile (NV) memory items in AMSS. ? AMSS uses calibration values during n