User's Manual

PAGE 48 TECHNICAL DESCRIPTION
• TX buffer Q606
• Microphone amplifier Q812
• Various switching functions
+3.3V Regulator U312
Regulated +3.3V supply (3N3)
• Digital supply for CODEC U800
• DSP U102
• FPGA U106
Regulated +3.3V supply (3Q3)
• I Q demodulator U401
Regulated +3.3V supply (3C3)
• Analogue supply for CODEC U800
Regulated +3.3V supply (3P3)
• PLL U701
• TCXO divider U702
Unregulated 13.8V (13V8 UNSW)
• TX PA module U2
• TX PA power control circuit Q3
• Active filter Q14/17/18/19
• Antenna changeover switch Q4/8/11
• RX mute switch Q811
• RX speaker amplifier U5
Negative Power Supply U300B/C
Provides -17.0V output (-17V0)
• Negative rail for VCO Varicap Negative Supply Q700, 701, 702 and Q703
-12.0V Output (-12V0)
• Negative rail for FE TUNE level translator Q900, 901, 902, 903 and
multiplexer U902