Motorola ASTRO Digital XTL 5000

viii Table of Contents
May 25, 2005 6881096C74-B
3.6.4.1 35-Watt Transmitter................................................................................................3-41
3.7 Frequency Generation Unit (FGU) ...............................................................................................3-45
3.7.1 VHF (136-174 MHz) Band...............................................................................................3-45
3.7.1.1 Reference Oscillator...............................................................................................3-46
3.7.1.2 LV Frac-N Synthesizer IC.......................................................................................3-46
3.7.1.3 Voltage Multiplier....................................................................................................3-47
3.7.1.4 Superfilter ...............................................................................................................3-47
3.7.1.5 Modulation..............................................................................................................3-47
3.7.1.6 Charge Pump Bias .................................................................................................3-48
3.7.1.7 Loop Filter ..............................................................................................................3-48
3.7.1.8 Lock Detect ............................................................................................................3-48
3.7.1.9 Transmitter Injection...............................................................................................3-48
3.7.1.10 Receiver Injection...................................................................................................3-49
3.7.1.11 Transmitter VCOs...................................................................................................3-49
3.7.1.12 Receiver VCOs.......................................................................................................3-49
3.7.1.13 Prescaler Feedback ...............................................................................................3-49
3.7.2 UHF Range 1 (380–470 MHz) Band ...............................................................................3-49
3.7.2.1 Reference Oscillator...............................................................................................3-50
3.7.2.2 LV Frac-N Synthesizer IC.......................................................................................3-50
3.7.2.3 Voltage Multiplier....................................................................................................3-51
3.7.2.4 Superfilter ...............................................................................................................3-51
3.7.2.5 Modulation..............................................................................................................3-51
3.7.2.6 Charge Pump Bias .................................................................................................3-52
3.7.2.7 Loop Filter ..............................................................................................................3-52
3.7.2.8 Lock Detect ............................................................................................................3-52
3.7.2.9 Transmitter Injection...............................................................................................3-52
3.7.2.10 Receiver Injection...................................................................................................3-52
3.7.2.11 Transmitter VCOs...................................................................................................3-53
3.7.2.12 Receiver VCOs.......................................................................................................3-53
3.7.2.13 Prescaler Feedback ...............................................................................................3-53
3.7.3 UHF Range 2 (450–520 MHz) Band ...............................................................................3-54
3.7.3.1 Reference Oscillator...............................................................................................3-55
3.7.3.2 LV Frac-N Synthesizer IC.......................................................................................3-55
3.7.3.3 Voltage Multiplier....................................................................................................3-55
3.7.3.4 Superfilter ...............................................................................................................3-56
3.7.3.5 Modulation..............................................................................................................3-56
3.7.3.6 Charge Pump Bias .................................................................................................3-56
3.7.3.7 Loop Filter ..............................................................................................................3-56
3.7.3.8 Lock Detect ............................................................................................................3-56
3.7.3.9 Transmitter Injection...............................................................................................3-57
3.7.3.10 Receiver Injection...................................................................................................3-57
3.7.3.11 Transmitter VCOs...................................................................................................3-57
3.7.3.12 Receiver VCOs.......................................................................................................3-57
3.7.3.13 Prescaler Feedback ...............................................................................................3-58
3.7.4 700–800 MHz Band.........................................................................................................3-58
3.7.4.1 Reference Oscillator...............................................................................................3-59
3.7.4.2 LV Frac-N Synthesizer IC.......................................................................................3-59
3.7.4.3 Voltage Multiplier....................................................................................................3-59
3.7.4.4 Superfilter ...............................................................................................................3-60
3.7.4.5 Modulation..............................................................................................................3-60
3.7.4.6 Charge Pump Bias .................................................................................................3-60
3.7.4.7 Loop Filter ..............................................................................................................3-60
3.7.4.8 Lock Detect ............................................................................................................3-60
3.7.4.9 Transmitter Injection...............................................................................................3-61