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3.5.4 Thermistor (RT100)
This thermistor senses temperature variations around UMTS PA to adjust PA gain deviation for assure
compliance with the applicable transmit power control standards. Negative temperature compensation
thermistor is used in the U300.
3.5.5 Dual band GSM power amplifier (U102)
The RF3166 is a high-power, high-efficiency power amplifier module with integrated power control that
provides over 50dB of control range. The device is a self-contained 6mmx6mm module with 50Ω input
and output terminals.
The device is designed for use as the final RF amplifier in GSM850, EGSM900, DCS and PCS
handheld digital cellular equipment and other applications in the 824MHz to 849MHz, 880MHz to
915MHz, 1710MHz to 1785MHz and 1850MHz to 1910MHz bands. The RF3166 incorporates RFMD’s
latest VBATT tracking circuit, which monitors battery voltage and prevents the power control loop from
reaching saturation.
The VBATT tracking circuit eliminates the need to monitor battery voltage, thereby minimizing
switching transients. The RF3166 requires no external routing or external components, simplifying
layout and reducing board space.
Figure 3.5.5-1 GSM PA functional block diagram
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Summary of Contents for U300
Page 3: ... 4 Z 3 X B O X C O M ...
Page 24: ...3 TECHNICAL BRIEF 25 Figure 3 3 1 1 RFR6250 IC functional block diagram Z 3 X B O X C O M ...
Page 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram Z 3 X B O X C O M ...
Page 76: ...4 TROUBLE SHOOTING 77 4 5 Checking WCDMA Block Z 3 X B O X C O M ...
Page 77: ...4 TROUBLE SHOOTING 78 4 3 5 1 2 Z 3 X B O X C O M ...
Page 82: ...4 TROUBLE SHOOTING 83 4 5 5 Check RF Rx Level Test Point RF Rx Level Z 3 X B O X C O M ...
Page 85: ...4 6 Checking GSM Block 4 TROUBLE SHOOTING 86 Z 3 X B O X C O M ...
Page 87: ...4 TROUBLE SHOOTING 88 Z 3 X B O X C O M ...
Page 89: ...4 TROUBLE SHOOTING 90 Z 3 X B O X C O M ...
Page 92: ...4 TROUBLE SHOOTING 93 Z 3 X B O X C O M ...
Page 95: ...4 TROUBLE SHOOTING 96 Z 3 X B O X C O M ...
Page 110: ...4 TROUBLE SHOOTING 111 C515 C516 CN501 Z 3 X B O X C O M ...
Page 116: ...4 TROUBLE SHOOTING 117 C201 C202 for MIC capacitor Z 3 X B O X C O M ...
Page 119: ...4 TROUBLE SHOOTING 120 Q400 Q401 Q402 VBATT GND Z 3 X B O X C O M ...
Page 140: ...6 BLOCK DIAGRAM 141 Z 3 X B O X C O M ...
Page 141: ...6 2 Interface Diagram U300 Interface Diagram 6 BLOCK DIAGRAM 142 Z 3 X B O X C O M ...
Page 149: ... 150 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 150: ... 151 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 151: ... 152 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 152: ... 153 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 153: ... 154 Z 3 X B O X C O M ...
Page 156: ...9 Calibration 157 Check testing object Click Start for Calibration Z 3 X B O X C O M ...
Page 157: ...9 Calibration 158 Show result of calibration Show result Z 3 X B O X C O M ...
Page 159: ... 160 Z 3 X B O X C O M ...
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