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WS1102 Datasheet(PDF) 9 Page - AVAGO TECHNOLOGIES LIMITED |
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WS1102 Datasheet(HTML) 9 Page - AVAGO TECHNOLOGIES LIMITED |
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9 / 16 page  Calibration Calibration procedure is shown in Figure 11. Two calibration tables, high mode and low mode respectively, are required for CoolPAM, which is due to gain difference in each mode. For continuous output power at the mode change points, the input power should be adjusted according to gain step during the mode change. Offset Value (difference between rising point and falling point) Offset value, which is the difference between the rising point (output power where PA mode changes from low mode to high mode) and falling point (output power where PA mode changes from high mode to low mode), should be adopted to prevent system oscillation. 3 to 5 dB is recommended for Hysteresis. Average Current and Talk Time Probability Distribution Function implies that what is important for longer talk time is the efficiency of low or medium power range rather than the efficiency at full power. WS1102 idle current is 14 mA and operating current at 16 dBm is 60 mA at nominal condition. Average current calculated with CDMA PDF is 33 mA in urban area and 54 mA in suburban area. This PA with low current consumption prolongs talk time by no less than 30 minutes compared to other PAs. Average current = ∫(PDF x Current)dp Pout Min PWR Max PWR High mode TX AGC Low mode Rising Falling Rising Falling High Mode Low Mode Pout Gain Figure11.Calibrationprocedure. Figure12.Settingofoffsetbetweenrisingandfallingpower. Figure13.CDMAPowerDistributionFunction. 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 -50 -40 -30 -20 -10 0 10 20 30 PA Out (dBm) CDG Urban CDG Suburban Conv PAM Digitally Controlled PAM Cool PAM 0 100 200 300 500 400 600 700 |
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