Simoco Xfin Blade, Service Manual

Page: 5 / 76

XFIN-BLADE-SM
TABLE OF CONTENTS
PAGE 5
3.5.8 Line 1 & 2 (RJ45) ..............................................................................................19
3.5.9 Facilities............................................................................................................20
3.5.10 PSTN Port (RJ11) .............................................................................................21
4 TECHNICAL DESCRIPTION ................................................................................23
4.1 MMI Board..........................................................................................................23
4.1.1 Description........................................................................................................24
4.2 Control Board....................................................................................................25
4.2.1 Circuit Board Layout .........................................................................................25
4.2.2 Circuit Description.............................................................................................26
4.2.2.1 LEDs.......................................................................................................26
4.2.2.2 Test Points..............................................................................................26
4.2.2.3 DSP ........................................................................................................30
4.2.2.4 Power......................................................................................................31
4.2.2.5 IXP..........................................................................................................31
4.2.2.6 CoDec.....................................................................................................32
4.2.2.7 Audio Interface........................................................................................32
4.2.2.8 PSTN Interface .......................................................................................33
4.2.3 Links .................................................................................................................33
4.3 Receiver and Transmitter Modules .................................................................36
4.3.1 Frequency Bands..............................................................................................36
4.3.2 Receiver............................................................................................................36
4.3.2.1 Front-end Filters and Rx Front-end Amplifier..........................................36
4.3.2.2 First Mixer and IF Section .......................................................................38
4.3.2.3 Quadrature Demodulator ........................................................................38
4.3.2.4 Receiver Audio Processing.....................................................................38
4.3.3 Transmitter........................................................................................................38
4.3.3.1 Drivers and PA Stages............................................................................39
4.3.3.2 Tx Power Control ....................................................................................41
4.3.3.3 Antenna Changeover and Harmonic Filter..............................................41
4.3.3.4 Transmitter Audio Processing.................................................................41
4.3.4 Frequency Synthesis ........................................................................................42
4.3.4.1 General ...................................................................................................42
4.3.4.2 PLL .........................................................................................................42
4.3.4.3 VCO........................................................................................................42
4.3.4.4 Negative Bias Generator and Loop Filter................................................42
4.3.4.5 Phase Modulator.....................................................................................43
4.3.4.6 Reference Oscillator ...............................................................................43
4.3.5 RF Sub-Assembly Internal Control Logic ..........................................................45
4.3.5.1 DSP and FPGA.......................................................................................46
4.3.5.2 DSP Clock Oscillator...............................................................................46
4.3.6 RF Sub-Assembly Internal Memory ..................................................................46
4.3.6.1 Multiplexer ..............................................................................................46
4.3.7 RF Sub-Assembly Internal Power Supplies ......................................................47
4.3.7.1 Power On Function .................................................................................47
4.3.7.2 Power Lines ............................................................................................47