Panasonic EB-GD93 Quick start guide

Issue 1
Revision 0
Order Number: MCUK001001G8
Personal Cellular Telephone
EB-GD93
Specification
Battery life figures are dependent on network conditions.
900 MHz 1800 MHz
Frequency Range Tx: 890 - 915MHz
Rx: 935 - 960 MHz
Tx: 1710 - 1785 MHz
Rx: 1805 - 1880 MHz
Tx/Rx frequency separation 45 MHz 95 MHz
RF Channel Bandwidth 200 kHz
Number of RF channels 124 374
Speech coding Full rate/Half rate/Enhanced Full rate
Operating temperature -10 °C to +55 °C
Type Class 4 Handheld Class 1 Handheld
RF Output Power 2 W maximum 1 W maximum
Modulation GMSK (BT = 0.3)
Connection 8 ch/TDMA
Voice digitizing 13 kbps RPE-LTP / 13 kps ACLEP / 5.6 kps CELP /
VSLEP
Transmission speed 270.3 kbps
Diversity Frequency hopping
Signal Reception Double superheterodyne
Intermediate Frequencies 225 MHz and 45 MHz
Antenna Terminal Impedance 50 τ
Antenna VSWR <2.1 : 1
Dimensions Height: 120 mm
Width: 45 mm
Depth: 16.4 mm
Volume 81 ml
Weight 80 g
Display Graphical chip on glass liquid crystal, Alphanumeric,
16 x 4 characters + 2 lines of icons.
Illumination 4 LEDs for the LCD (7-colour)
8 LEDs for the keypad (Green)
1 LED Incoming call (Green)
1 Charging LED (Red)
Keys 18-key Keypad, Navigation key, Memo key.
SIM Plug-in type only
External DC Supply Voltage 5.8 V
Battery 3.7 V nominal, 650mAh, Li-Ion
Standby Battery Life
DRX 9
170 hrs maximum
Conversation Battery Life
PL 7, DTX 50%
210 minutes
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not
contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
repair the product or products dealt with in this service manual by anyone else could result in serious injury or death.
© 2000 Matsushita Communication Industrial UK
Ltd. All rights reserved. Unauthorized copying and
distribution is a violation of law.

Issue 1 - ii - MCUK001001G8
Revision 0 Techni cal G ui de
Company Liability
This Technical Guide is copyright and issued on the strict understanding that it is not be reproduced, copied, or disclosed to
any third party, either in whole or in part, without the prior written consent of Matsushita Communication Industrial UK Ltd.
Every care has been taken to ensure that the contents of this manual give an accurate representation of the equipment.
However, Matsushita Communication Industrial UK Ltd. accepts no responsibility for inaccuracies which may occur and
reserves the right to make changes to specification or design without prior notice.
The information contained in this manual and all rights in any designs disclosed therein, are and remain the exclusive property
of Matsushita Communication Industrial UK Ltd.
Other patents applying to material contained in this publication:
BULL CP8 PATENTS
Comments or correspondence concerning this manual should be addressed to:
Customer Support Department,
Matsushita Communication Industrial UK Ltd.,
Colthrop, Thatcham,
Berkshire, RG19 4ZD.
ENGLAND
© 2000 Matsushita Communication Industrial UK Ltd.

MCUK001001G8 Section Issue 1
Technical Guide – iii – Revision 0
CONTENTS
1 INTRODUCTION
1.1 Purpose of this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Structure of the Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 INTERFACES AND TEST POINTS
2.1 Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 RF OVERVIEW
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4TRANSMITTER
4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Uplink Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 RECEIVER
5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.2 Downlink Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 BASEBAND OVERVIEW
6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Subscriber Identity Module . . . . . . . . . . . . . . . . . . . . . . 20
6.4 Time Processing Unit (TPU) . . . . . . . . . . . . . . . . . . . . . 20
6.5 CPU Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.6 LCD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.7 Real Time Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.8 Microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.9 Speaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.10 Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.11 UART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.12 Acessory ASIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7 HERCULES
7.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.2 Digital Signal Processor . . . . . . . . . . . . . . . . . . . . . . . . 27
7.3 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.4 Memory Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.5 Interrupt Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.6 General Purpose I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.7 Dedicated I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8OMEGA
8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Uplink I and Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.3 Downlink I and Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.4 Power Amplifier Ramp . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.5 AFC Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.6 Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.7 Auxiliary A/D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.8 Charging Voltage Control. . . . . . . . . . . . . . . . . . . . . . . . 34
9 POWER SUPPLIES
9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.2 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.3 Power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.4 Power-down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
9.5 Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Issue 1 Section MCUK001001G8
Revision 0 – iv – Technical Guide
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INTRODUCTION
MCUK001001G8 Section 1 Issue 1
Technical Guide – 1 – Revision 0
1 INTRODUCTION
1.1. Purpose of this Guide
This Technical Guide contains technical information for the Panasonic GD93 personal cellular telephone operating on the GSM
Digital Cellular Network.
1.2. Structure of the Guide
The manual is structured to provide service engineering personnel with the following technical information:
1. Interface details and relevant test points.
2. Functional description of each section of the mobile telephone.
3. Detailed description of each section of the mobile telephone.

INTRODUCTION
Issue 1 Section 1 MCUK001001G8
Revision 0 – 2 – Technical Guide
This page is intentionally blank.

INTERFACES AND TEST POINTS
MCUK001001G8 Section 2 Issue 1
Technical Guide – 3 – Revision 0
2 INTERFACES AND TEST POINTS
2.1. Interfaces
2.1.1 Main and Keypad PCBs
The interface between Main and Keypad PCBs is made via a 33-way connector.
Figure 2.1: Interboard Connector
No. Signal Name MAIN <==> KEYPAD Function Connection
1 VR ==> LCD Voltage Reference
2 V[5] ==> LCD Voltage Reference
3 V[4] ==> LCD Voltage Reference
4 V[3] ==> LCD Voltage Reference
5 V[2] ==> LCD Voltage Reference
6 V[1] ==> LCD Voltage Reference
7 CAP2+ for LCD Stepup DC/DC
8 CAP2- for LCD Stepup DC/DC
9 CAP1- for LCD Stepup DC/DC
10 CAP1+ for LCD Stepup DC/DC
11 CAP3- for LCD Stepup DC/DC
12 VOUT
13 GND Ground GND
14 D28VB Power Source for LCD module D28VB
15 DOUT LCD control Serial data HERCULES pin 5
16 S_CLK LCD control Serial clock HERCULES pin 12
17 LCD_RS ==> LCD control Address data select HERCULES pin 59
18 nRESET ==> MPU nRESET signal
19 CS.LCD ==> LCD chip select signal HERCULES pin 14
20 GND Ground GND
21 BL[4] KEY Backlight ACC IC #49
22 VBAT Battery Voltage
23 KBR(4) <== Key Row 4 signal for Key scan HERCULES pin 179
24 KBR(3) <== Key Row 3 signal for Key scan HERCULES pin 178
25 KBR(2) <== Key Row 2 signal for Key scan HERCULES pin 176
26 KBR(1) <== Key Row 1 signal for Key scan HERCULES pin 174
27 KBR(0) <== Key Row 0 signal for Key scan HERCULES pin 173
28 KBC(4) ==> Key Column 4 signal for Key scan HERCULES pin 172
29 KBC(3) ==> Key Column 3 signal for Key scan HERCULES pin 171
30 KBC(2) ==> Key Column 2 signal for Key scan HERCULES pin 170
31 KBC(1) ==> Key Column 1 signal for Key scan HERCULES pin 169
32 KBC(0) ==> Key Column 0 signal for Key scan HERCULES pin 165
33 nPOWKEY <== Power Key sense signal OMEGA pin 74
10224-1
KBR(1) 7
23
GROUND
GROUND
10
26
KBC(2)
1
17
KBC(3)
BL4 2
18
KBC(4)
VBAT 3
19
KBR(0)
KBR(4) 4
20
KBR(3) 5
21
KBR(2) 6
22
CAP2+
VR
V[5]
V[4]
V[3]
V[2]
V[1]
CAP2-8
24
nPOWKEY LCD_CS
9
25
CAP3-
CAP1+
11
27
CAP1-
VOUT
12
28
LCD_RS
13
29 D2V8
nRESET
14
30
DOUT
KBC(0)
15
31 S_CLK
KBC(1) 16
32
33
CN801

INTERFACES AND TEST POINTS
Issue 1 Section 2 MCUK001001G8
Revision 0 – 4 – Technical Guide
2.1.2 External I/O
Figure 2.2: External I/O Connector
No. Name HH <==>EXT Function H/H Circuit
1 AGND - Audio Ground
2 TX-AUDIO <== Sending Audio
3 RX-AUDIO ==> Received Audio
4 VBAT IN /
DATA_MODE0 <== Battery Voltage Supply input / Data Accessory Recognition 0
5 nACC_SENSE <== Handsfree / Data Accessory detection
6 nAUDIO-ON ==> Audio Path Control
(L: On = un mute, Hi-Z: Off = mute)
7 SERIAL UP <== Upward serial
(9600 bps: SMS cable)
(33.8 kbps: Data adaptor I/F Card)
(up to 38.4 kbps: Soft Modem cable)
(57.6 kbps: Test Command)
8 SERIAL-DOWN ==> Downward serial
(Baud rate same as SERIAL-UP)
9 ACC_PWR ==> Peripheral power supply
(on: less than 100 mA)
10 DTR /
DATA_MODE1 <== RS232C: Data Terminal Ready / Data Accessory recognition 1
11 RTS <== RS232C: Request to Send
12 CTS / PA-ON ==> PA control signal for test trigger
(L: off, H 2.8V: on)
13 EXT-PWR <== Power supply for Battery Charge
14 GND - Power supply and digital signal
ground
114
CASE FRONT
10225-1
10095-1
560
0.1
10222-1
330
4.7 k
10105-1
330
2.2k
47k
10104-1
330
10097-1
3
30
330p
10223-1
10095-1

INTERFACES AND TEST POINTS
MCUK001001G8 Section 2 Issue 1
Technical Guide – 5 – Revision 0
2.1.3 SIM Interface
2.2. Test Points
2.2.1 Main PCB
Pin Signal
1SIMPWR(3V/5V)
2SIM_RST
3 SIM_CLK
4 Not connected
5 Ground
6 Not connected
7 SIM-I/O
8 Not connected
TP No. Signal
TP601 nAUDIO_ON
TP602 DTR/DATA_MODE1
TP603 RTS
TP604 CTS/PA_ON
TP605 SERIAL_DOWN
TP606 SERIAL_UP
TP607 VBAT_IN/DATA_MODE0
TP608 KBR[4]
TP609 KBR[3]
TP610 KBR[2]
TP611 KBR[1]
TP612 KBR[0]
TP613 KBC[4]
TP614 KBC[3]
TP615 KBC[2]
TP616 KBC[1]
TP617 KBC[0]
TP618 nPOWKEY
TP619 SIM I/O
TP620 SIMCLK
TP621 SIM RST
TP622 SIMPWR
TP623 HERCULES TX_IRDA
TP624 HERCULES RX_IRDA
TP625 HERCULES CLK32_OUT
TP626 A28V
TP627 D28VB
TP628 D28V
TP629 D18V
TP630 D20V
TP631 EARP
TP632 EARN
TP633 BAT_TEMP
TP634 BAT_ID
TP635 HF_TXAUDIO
TP636 HF_RXAUDIO
TP No. Signal
TP637 EXT_PWR
TP638 BL[1]
TP639 BL[2]
TP640 BL[3]
TP641 CHARGING_LED
TP642 PAGING_LED
TP643 VBAT
TP644 VBAT
TP645 U607 Pin 1 (32KOUT)
TP646 GROUND
TP647 GROUND
TP649 DTHFO_P
TP650 DTHFO_N
TP651 PHF_DET
TP652 HSRX_AUD
TP653 HSTX_AUD
TP654 E608 (MIC)
TP655 E607 (MIC)
TP656 n_ACC_SENSE
TP658 BL[4]
TP701 HERCULES TDI
TP702 HERCULES TDO
TP703 HERCULES TCK
TP704 HERCULES TMS
TP707 HERCULES nBSCAN
TP708 HERCULES SSDX
TP709 HERCULES SSDR
TP710 HERCULES SSCLK
TP711 HERCULES SSRST
TP712 OMEGA TESTRESET
TP713 OMEGA RESPWRONZ
TP715 OMEGA TDO
TP901 BACK_LED

INTERFACES AND TEST POINTS
Issue 1 Section 2 MCUK001001G8
Revision 0 – 6 – Technical Guide
2.2.2 Keypad PCB
TP No. Signal
TP801 VBAT
TP802 DS801 / R801
TP803 DS802 / R801
TP804 DS803 / R802
TP805 DS804 / R802
TP806 DS805 / R803
TP807 DS806 / R803
TP808 DS807 / R804
TP809 DS808 / R804
TP810 nPOWKEY
TP811 KBR[0]
TP812 BL4
TP813 GROUND

RF OVERVIEW
MCUK001001G8 Section 3 Issue 1
Technical Guide – 7 – Revision 0
3 RF OVERVIEW
3.1. Introduction
3.1.1 General Specifications
The telephone is a Dual Band product incorporating two switchable transceivers, one for the GSM 900 band and another for
the GSM 1800 (DCS 1800) band. The transmit and receive bands for the mobile are given in the table below:
Other salient technical features are as follows:
3.1.2. Main PCB Description
All components required for the RF and Logic circuits, excluding the LCD module and backlight LEDs, are contained on the
Main PCB. The Main PCB has six layers with an Any Layer Interstitial Via-Hole (ALIVH) structure which can connect from / to
any layer. Surface and back layer tracks are gold-plated to prevent oxidisation and enable better soldering. The PCB thickness
is 0.7 mm ±0.1 mm.
The majority of RF components are located on both sides of the top half area of the Main PCB. The Keypad PCB back layer
consists mostly of groundplane which is used to provide RF shielding. A metallised plastic chassis has also been designed to
provide smaller walled sections to isolate sensitive RF areas like the synthesiser block from high level interference such as the
PA output and logic noise.
The back cover has a formed shielded enclosure to reduce further spurious emissions and logic noise.
3.2. Functional Description
3.2.1. Frequency Plan
The frequency plan is shown below:
Tx Rx
GSM 900 890-915 MHz 935-960 MHz
GSM 1800 1710-1785 MHz 1805-1880 MHz
GSM 900 GSM 1800
Rx Bandwidth 25 MHz 75 MHz
Tx Bandwidth 25 MHz 75 MHz
Duplex Spacing 45 MHz 95 MHz
Number of Channels 124 374
AFRCN (Channel Numbers) 1-124 512-885
1st Tx Channel 890.2 MHz 1710.2 MHz
Last Tx Channel 914.8 MHz 1784.8 MHz
1st Rx Channel 935.2 MHz 1805.2 MHz
Last Rx Channel 959.8 MHz 1879.8 MHz
Maximum Tx Power 33.0 dBm
(Class 4) (PL5)
30.0 dBm
(Class 1) (PL0)
Minimum Tx Power 5.0 dBm
(PL19)
0.0
(PL15)
Tx Tx IF RFLO Tx IFLO Tx
GSM 900 890 - 915 MHz 270 MHz 1160 - 1185 MHz 540 MHz
GSM 1800 1710 - 1785 MHz 135 MHz 1575 - 1650 MHz 540 MHz
Rx Rx 1st IF Rx 2nd IF RFLO Rx IFLO Rx
GSM 900 935 - 960 MHz 225 MHz 45 MHz 1160 - 1185 MHz 540 MHz
GSM 1800 1805 - 1880 MHz 225 MHz 45 MHz 1580 - 1655 MHz 540 MHz

RF OVERVIEW
Issue 1 Section 3 MCUK001001G8
Revision 0 – 8 – Technical Guide
Figure 3.1: RF Block Diagram
Figure 3.2: GSM 900 Frequency Plan
TCXO
(NDK)
2 2
935 ~ 960 MHz
1,805 ~
1,880 MHz
Dual Rx
SAW PF IF SAW
PF
225 MHz
RF Switch
Tx VCO
890 ~ 915 MHz
1,710 ~ 1,785 MHz
Phase
Detector
I&Q
Mod
Dual PA
PF08103 -02-T
(Hitachi) %2
GSM: 270 MHz
DCS: 135 MHz
GSM: 270 MHz
DCS: 134, 135 MHz
GSM: 1,160 ~ 1,185 MHz
DCS: Rx 1,580 ~ 1,655 MHz
Tx 1,575 ~ 1,650 MHz
RF
Synthe
RF VCO
1,160 ~ 1,185 MHz
1,575 ~ 1,655 MHz
DCS: 270 MHz
GSM: 540 MHz
270 MHz
%2 %2
%6
45 MHz
right III RF IC
HD155133TFE
APC
IC
Coupler
w/ LPF
LC PF
Coupler
w/ LPF
IF VCO
(VJ3)
IF
Synthe
10213-1
935-960 MHz
RF LO
1160-1185 MHz
TX VCO
890-915 MHz Fcomparison
270 MHz
Fdiff
270 MHz
Rx 1st IF
225 MHz
IF LO
VCO
540 MHz
Rx 2nd IF
45 MHz
÷2
45 MHz
270 MHz
I
Q
I
Q
÷2 ÷6
90 MHz
÷2
270 MHz
10214-1

RF OVERVIEW
MCUK001001G8 Section 3 Issue 1
Technical Guide – 9 – Revision 0
Figure 3.3: GSM 1800 Frequency Plan
3.2.2 General
The RF circuit design is built around an Hitachi Bright III GSM transceiver IC. Other major components include filters, power
amplifiers, VCOs and the antenna subsystems.
In either band, GSM 900 or GSM 1800, the Rx IF is fixed at 225 MHz and the 2nd IF at 45 MHz. Therefore, the 2nd local
oscillator is fixed at 540 MHz for receiver modes. This oscillator is also fixed at 540 MHz for transmit modes.
The Tx VCO is on-channel in both GSM 900 and GSM 1800 modes of operation.
3.2.3 Antenna
The antenna is a fixed helical type.
A mechanical switch is used to route the RF signal from the external antenna for handsfree operation and test purposes.
3.2.4 Transmit and Receive
The transmit and receive paths are covered in their own specific chapters later in this manual.
3.2.5 RF and Accessory Connector
An external antenna connector for use with handsfree accessories is located close to the PA module to minimise power loss.
Therefore, the PAs do not have to be driven so hard, allowing the voltage supply to be lower, thus improving battery
performance.
1805-1880 MHz
Rx RF LO
1580-1655 MHz
Tx RF LO
1575-1650 MHz
TX VCO
1710-1785 MHz Fcomparison
135 MHz
Fdiff
135 MHz
Rx 1st IF
225 MHz
IF LO VCO
540 MHz
Rx 2nd IF
45 MHz
÷2
45 MHz
270 MHz
I
Q
I
Q
÷2 ÷6
90 MHz
÷2
270 MHz
10215-1
135 MHz

RF OVERVIEW
Issue 1 Section 3 MCUK001001G8
Revision 0 – 10 – Technical Guide
This page is intentionally blank.

TRANSMITTER
MCUK001001G8 Section 4 Issue 1
Technical Guide – 11 – Revision 0
4 TRANSMITTER
4.1. Introduction
This section provides a technical description of the transmitter circuits of the Main PCB. A circuit diagram of the whole system
is provided in the Service Manual.
4.2. Uplink Frequencies
These assemblies MUST be performed by qualified service personnel at an authorised service centre.
The following Warnings and Cautions MUST be observed during all disassembly / reassembly operations:
4.2.1 GSM 900
The uplink frequencies for the GSM 900 band are as follows:
Uplink frequencies for the GSM 900 band can be calculated as follows:
Uplink frequency = 890 MHz + (ARFCN x 0.2 MHz)
e.g. for CH55
890 MHz + (55 x 0.2 MHz)
= 890 MHz + (11 MHz)
= 901 MHz
4.2.2. GSM 1800
The uplink frequencies for the GSM 1800 band can be calculated as follows:
Uplink frequency = 1710 MHz + ((AFRCN - 511) x ).2MHz)
e.g. for CH512
1710 MHz + ((512 - 511) x 0. 2MHz)
= 1710 MHz + (0.2 MHz)
= 1710.2 MHz
CHANNEL
NUMBERS UPLINK FREQUENCIES
1-5
6-10
11- 1 5
16-20
21-25
890.200
891.200
892.200
893.200
894.200
890.400
891.400
892.400
893.400
894.400
890.600
891.600
892.600
893.600
894.600
890.800
891.800
892.800
893.800
894.800
891.000
892.000
893.000
894.000
895.000
26-30
31-35
36-40
41-45
46-50
895.200
896.200
897.200
898.200
899.200
895.400
896.400
897.400
898.400
899.400
895.600
896.600
897.600
898.600
899.600
895.800
896.800
897.800
898.800
899.800
896.000
897.000
898.000
899.000
900.000
51-55
56-60
61-65
66-70
71-75
900.200
901.200
902.200
903.200
904.200
900.400
901.400
902.400
903.400
904.400
900.600
901.600
902.600
903.600
904.600
900.800
901.800
902.800
903.800
904.800
901.000
902.000
903.000
904.000
905.000
76-80
81-85
86-90
91-95
96-100
905.200
906.200
907.200
908.200
909.200
905.400
906.400
907.400
908.400
909.400
905.600
906.600
907.600
908.600
909.600
905.800
906.800
907.800
908.800
909.800
906.000
907.000
908.000
909.000
910.000
101-105
106-110
111- 11 5
116-120
121-124
910.200
911.200
912.200
913.200
914.200
910.400
911.400
912.400
913.400
914.400
910.600
911.600
912.600
913.600
914.600
910.800
911.800
912.800
913.800
914.800
911.000
912.000
913.000
914.000

TRANSMITTER
Issue 1 Section 4 MCUK001001G8
Revision 0 – 12 – Technical Guide
4.3. Functional Description
4.3.1 Circuit Description
Figure 4.1: Transmitter Block Diagram
The transmitter design is based on an IQ Modulator and operates at Class 4 (2W) in the GSM 900 band and at Class 1 (1W)
in the GSM 1800 band. The architecture has been carefully chosen to limit GSM transmitter noise in the receiver band without
the requirement for a duplexer.
The RF IC Bright III (U104) provides the following transmitter functions:
• I, Q Quadrature modulator
• Down conversion mixer for modulated signal to intermediate frequency.
• Phase detector for PLL modulation loop.
The IF LO signal generated by the IF VCO is modulated by the baseband I, Q signals in the quadrature modulator. Output from
the quadrature modulator is fed into the phase detector for the PLL modulation loop.
The output from the Tx VCO is fed in to the down conversion mixer. It is mixed with the 1st LO output (from the RF VCO) and
converted to the IF frequency.
The charge pump output signal produced by the phase detector is fed back to the Tx VCO to generate modulated RF output.
The Tx VCO has been designed to provide a high level output thus obviating the need for a driver amplifier. Therefore, the Tx
VCO output is applied directly to the PA which amplifies the signal to any required level up to PL5 (33 dBm at the antenna) for
GSM 900 and PL0 (30 dBm) for GSM 1800. The output from the PA is fed to a low-pass filter within the directional coupler to
ensure that there is sufficient margin in the rejection of second and third harmonics.
IQ
Modulator
Loop
Filter
Phase
Detector
Diplexer
U102
Coupler
E101
900
1800
Dual Band
Tx VCO
U103 Coupler
E102
Dual Band PA
U101
Antenna
+ Sw.
DC
Mixer
Dual Band Transceiver (PART)
U104
10220-1
APC
U150

TRANSMITTER
MCUK001001G8 Section 4 Issue 1
Technical Guide – 13 – Revision 0
4.3.2. GSM 900 Signal Levels
The transmitter signal levels for the GSM 900 band are as follows:
Figure 4.2: GSM 900 Transmitter Signal Levels
4.3.3. GSM 1800 Signal Levels
The transmitter signal levels for the GSM 1800 band are as follows:
Figure 4.3: GSM 1800 Transmitter Signal Levels
-50.0
-30.0
-10.0
10.0
30.0
VCO Splitter Attenuator HP Filter PA Coupler Switch H/F Switch
Wanted Fo 3Fo
10218-1
dBm
-50.0
-30.0
-10.0
10.0
30.0
VCO Splitter Attenuator HP Filter PA Coupler Switch H/F Switch
Wanted Fo 3Fo
10219-1
dBm

TRANSMITTER
Issue 1 Section 4 MCUK001001G8
Revision 0 – 14 – Technical Guide
This page is intentionally blank

RECEIVER
MCUK001001G8 Section 5 Issue 1
Technical Guide – 15 – Revision 0
5 RECEIVER
5.1. Introduction
This Section provides a technical description of the receiver section of the Main PCB. A complete circuit diagram is provided
in the Service Manual.
5.2. Downlink Frequencies
5.2.1. GSM 900
The downlink frequencies for the GSM 900 band are as follows:
Downlink frequencies for the GSM 900 band can be calculated as follows:
Downlink frequency = 935 MHz + (ARFCN x 0.2 MHz)
e.g. for CH55
935 MHz + (55 x 0.2 MHz)
= 935 MHz + (11 MHz)
= 946 MHz
5.2.2. GSM 1800
The downlink frequencies for the GSM 1800 band can be calculated as follows:
Downlink frequency = 1805 MHz + ((ARFCN - 511) x 0.2 MHz)
e.g. for CH512
1805 MHz + ((512 - 511) x 0.2 MHz)
= 1805 MHz + (0.2 MHz)
= 1805.2 MHz
CHANNEL
NUMBERS DOWNLINK FREQUENCIES (MHz)
1-5
6-10
11- 1 5
16-20
21-25
935.200
936.200
937.200
938.200
939.200
935.400
936.400
937.400
938.400
939.400
935.600
936.600
937.600
938.600
939.600
935.800
936.800
937.800
938.800
939.800
936.000
937.000
938.000
939.000
940.000
26-30
31-35
36-40
41-45
46-50
940.200
941.200
942.200
943.200
944.200
940.400
941.400
942.400
943.400
944.400
940.600
941.600
942.600
943.600
944.600
940.800
941.800
942.800
943.800
944.800
941.000
942.000
943.000
944.000
945.000
51-55
56-60
61-65
66-70
71-75
945.200
946.200
947.200
948.200
949.200
945.400
946.400
947.400
948.400
949.400
945.600
946.600
947.600
948.600
949.600
945.800
946.800
947.800
948.800
949.800
946.000
947.000
948.000
949.000
950.000
76-80
81-85
86-90
91-95
96-100
950.200
951.200
952.200
953.200
954.200
950.400
951.400
952.400
953.400
954.400
950.600
951.600
952.600
953.600
954.600
950.800
951.800
952.800
953.800
954.800
951.000
952.000
953.000
954.000
955.000
101-105
106-110
111- 11 5
116-120
121-124
955.200
956.200
957.200
958.200
959.200
955.400
956.400
957.400
958.400
959.400
955.600
956.600
957.600
958.600
959.600
955.800
956.800
957.800
958.800
959.800
956.000
957.000
958.000
959.000

RECEIVER
Issue 1 Section 5 MCUK001001G8
Revision 0 – 16 – Technical Guide
5.3. Functional Description
5.3.1. Dual Band Receiver IC
The main building block for the Dual Band receiver is the Hatchi Bright III GSM transceiver IC (U104). The receiver is a
superheterodyne type with the 1st IF at 225 MHz and 2nd IF at 45 MHz. The intermediate frequencies are common to both
frequency bands.
The receiver section of U104 contains the following stages:
• Dual band LNA stage.
• Gain controlled 1st mixer for GSM 900 band.
• Gain controlled 1st mixer for GSM 1800 band.
• Gain controlled 2nd mixer.
• Gain controlled IF amplifier.
• I, Q quadrature down converter.
• Baseband operational amplifiers for further amplification and some filtering of the baseband I, Q signals.
5.3.2. Circuit Description
Figure 5.1: Dual Band Receiver
RF input to the receiver is either via the antenna or via the external antenna connector. The input signal from the antenna is
fed into the GSM 900 / GSM 1800 dual band Antenna switch module which comprises a diplexer and diode switches. The
diplexer splits the two GSM frequency bands whilst the pin switches route the signal flow from the receiver and the transmitter
as required.
The output is applied to the 1st dual band receiver SAW filter which provides the roofing filter for the Rx front end for both
900 MHz and 1800 MHz bands. Note that the apprpriate signal path will be set by the Antenna switching module. The output
is applied to the internal dual LNA of the Bright III IC.
The Bright III LNA gain is constant, typical gain is +17 dB for GSM 900 and +16 dB for GSM 1800, with a typical noise factor
of 1.5 dB and 1.7 dB respectively.
The output from the dual LNA passes through a dual LC filter which is designed to reduce interference at image spurious
frequency, and is fed into the 1st mixer of each band. Both 1st mixers are gain controlled by 3-wire bus to (typically) between
+9.5 dB and -1.0 dB for GSM 900 and between +8.5 dB and -4.0 dB for GSM 1800.
The 1st IF output at 225 MHz is filtered by the differential IF SAW filter to reduce adjacent channel interference before
application to the 2nd mixer. The use of differential filters eliminates the need for a balun transformer, providing some cost and
space advantage.
The 2nd mixer is also gain controlled by 3-wire bus between, typically, +13.0 dB and -3.0 dB. Gain switching is synchronised
with the 1st mixer. The 2nd mixer output at 45 MHz is filtered by an L-C network before it is applied to the IF amplifier.
The IF amplifier is gain controlled by 3-wire bus for AGC purposes. The gain can be adjusted between -29 dB and +69 dB in
2 dB steps.
PGC
1800
DUAL BAND
RX BPF
FL202
DUAL BAND TRANSCEIVER (PART)
IF
SAW
1st
Mixer 2nd Mixer
900
1800
900
LPF Rx
Tx
Rx
Tx
Ext
Ant.
HPF
10221-1
DUAL BAND
Rx SAW
I
Q
Demodulator
U104
FL201 LNA
DIPLEXER
U104
FL700