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WS1103 Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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WS1103 Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED |
7 / 15 page 7 Peripheral Circuit in Handset Figure 10. Peripheral circuit Calibration Calibration procedure is shown in Figure 11. Two calibration tables, high mode and low mode respective- ly, are required for Cool PAM, which is due to gain differ- ence in each mode. For continuous output power at the mode change points, the input power should be adjust- ed 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 & 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. WS1103 idle current is 13 mA and operating current at 16 dBm is 65 mA at nominal condition. This PA with low current consumption prolongs talk time by no less than 30 minutes compared to other PAs. Figure 11. Calibration procedure Figure 12. Setting of offset between rising and falling power Figure 13. CDMA power distribution function TX_AGC Low Mode High Mode Min. PWR Falling Rising Max. PWR Pout GAIN Low Mode High Mode Falling Rising Pout 5.00 4.50 4.00 3.50 3.00 2.50 2.00 1.50 1.00 0.50 0 700 600 CDG Urban Conventional PAM Digitally Controlled PAM Cool PAM CDG Suburban 500 400 300 200 100 0 -50 -40 -30 -20 -10 PA Out (dBm) 0 10 20 30 Vcc1 Vcc2 RF IN RF OUT Vcont GND GND Vref Duplexer TX FILTER MSM PA_RO PA_ON RF Out Output Matching Circuit RF In WS1103 C1 C8 C7 C6 L1 C2 VBATT C5 C4 +2.85 V C 3 NOTES: • Recommended voltage for Vref is 2.85 V. • Place C1 near to Vref pin. • Place C3 and C4 close to pin 1 (Vcc1) and pin 10 (Vcc2). These capacitors can affect the RF performance. • Use 50 Ω transmission line between PAM and Duplexer and make it as short as possible to reduce conduction loss. • π-type circuit topology is good to use for matching circuit between PA and Duplexer. Notes: • Recommended voltage for Vref is 2.85 V. • Place C1 near to Vref pin. • Place C3 and C4 close to pin 1 (Vcc1) and pin 8 (Vcc2). These capacitors can affect the RF performance. • Use 50 W transmission line between PAM and Duplexer and make it as short as possible to reduce conduction loss. • π-type circuit topology is good to use for matching circuit between PA and Duplexer. |
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