User's Manual

iv Table of Contents
October 14, 2003 6881094C31-C
2.1 General ..........................................................................................................................................2-1
2.2 DC Power Routing—Transceiver Board ........................................................................................2-3
2.3 DC Power Routing—VOCON Board..............................................................................................2-3
Chapter 3 Theory of Operation............................................................ 3-1
3.1 Transceiver Board..........................................................................................................................3-2
3.1.1 Interconnections................................................................................................................3-3
3.1.1.1 Battery Connector J3 ...............................................................................................3-3
3.1.1.2 VOCON Connector P1.............................................................................................3-3
3.1.1.3 Antenna Port J2 .......................................................................................................3-5
3.1.1.4 Serial EEPROM .......................................................................................................3-5
3.1.1.5 Power Conditioning Components ............................................................................3-5
3.1.2 Receiver............................................................................................................................3-5
3.1.2.1 Receiver Front End..................................................................................................3-6
3.1.2.2 Receiver Back End ..................................................................................................3-7
3.1.3 Transmitter........................................................................................................................3-8
3.1.3.1 Power Distribution....................................................................................................3-9
3.1.3.2 Driver Amplifier ........................................................................................................3-9
3.1.3.3 Power Amplifier Transistor Q107...........................................................................3-10
3.1.3.4 Directional Coupler ................................................................................................3-10
3.1.3.5 Antenna Switch......................................................................................................3-10
3.1.3.6 Harmonic Filter.......................................................................................................3-10
3.1.3.7 RF Detectors D101 and D102................................................................................3-11
3.1.3.8 Summing Amplifier U106 .......................................................................................3-11
3.1.3.9 Power-Control IC (PCIC) U104..............................................................................3-11
3.1.4 Frequency Generation Unit (FGU)..................................................................................3-13
3.1.4.1 Reference Oscillator Y200 .....................................................................................3-13
3.1.4.2 Fractional-N Frequency Synthesizer (FracN) IC U202 ..........................................3-14
3.1.4.3 Loop Filter..............................................................................................................3-15
3.1.4.4 VCO Buffer IC (VCOBIC).......................................................................................3-15
3.2 VOCON Board .............................................................................................................................3-16
3.2.1 Interconnections..............................................................................................................3-16
3.2.1.1 Universal Connector J101......................................................................................3-17
3.2.1.2 Encryption Connector J701....................................................................................3-17
3.2.1.3 Keypad Module Connector P107...........................................................................3-17
3.2.1.4 RF Interface Connector P201 ................................................................................3-17
3.2.1.5 Display Module Connector P301 ...........................................................................3-17
3.2.2 Controller and Memory ...................................................................................................3-17
3.2.2.1 Patriot IC U401 ......................................................................................................3-18
3.2.2.2 Static RAM (SRAM) U403......................................................................................3-20
3.2.2.3 FLASH Memory U402............................................................................................3-21
3.2.3 Audio and Power.............................................................................................................3-22
3.2.3.1 GCAP II IC U501....................................................................................................3-22
3.2.3.2 5 V Regulator U505 ...............................................................................................3-23
3.2.3.3 1.55 V Regulator....................................................................................................3-23
3.2.3.4 Audio Pre-Amplifier U502 ......................................................................................3-24
3.2.3.5 Audio Power Amplifier U503..................................................................................3-24
3.2.3.6 EEPOT U509 .........................................................................................................3-24
3.2.4 Interface Support ............................................................................................................3-24
3.2.4.1 Flipper IC U301......................................................................................................3-25
3.2.4.2 ESD Protection Circuitry ........................................................................................3-27
3.2.4.3 Universal Connector Interface Circuitry .................................................................3-28