After Sales Technical Documentation
NHE–5 Series Transceiver
Chapter 3
TRANSCEIVER
OVERVIEW
Original 06/96
NHE–5
After Sales
Transceiver Overview
Technical Documentation
CHAPTER 2 – TRANSCEIVER OVERVIEW
Contents
Introduction Page 3–3
Block Diagram of External Connections Page 3–3
Modes of Operation Page 3–4
Circuit Description Page 3–4
Block Diagram Page 3–5
Power Distrubution Diagrams Page 3–5
Page 3–2
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After Sales
NHE–5
Technical Documentation
Introduction
The NHE–5 is a radio transceiver unit for the pan–European GSM network. It
is a GSM phase 1 power class 4 transceiver providing 11 power levels with a
maximum output power of 2 W.
The transceiver consists of a Radio module (GT8) and assembly parts
The full–size SIM (Subscriber Identity Module) card is located inside the phone.
Block Diagram of External Connections
BUZZER EARPIECE
2
Keypad
2
SIM
Transceiver Overview
Display
ANTENNA
FLASH
LOADING
1
RADIO MODULE
5
SYSTEM
CONNECTOR
17 5
GT8
12
CHARGER
2+2
24
MIC
2
4
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BATTERY
Page 3–3
NHE–5
After Sales
Transceiver Overview
Modes of Operation
There are five different operation modes
– power off mode
– idle mode
– active mode
– charge mode
– local mode
In the power off mode only the circuits needed for power up are supplied.
In the idle mode circuits are in reset, powered down and clocks are stopped as
long as possible.
In the active mode all the circuits are supplied with power although some parts
might be in the idle state part of the time.
The charge mode is in parallel of all previous modes. The charge mode itself
consists of three different state: fast charge, discharge and tricle.
Technical Documentation
The local mode is used for alignment and testing.
Circuit Description
The transceiver electronics consist of the Radio Module (RF + System blocks),
the UI PCB, the display module and audio components. The keypad and the
display module are connected to the Radio Module with a connectors. System
blocks and RF blocks are interconnected with PCB wiring. The Transceiver is
connected to accessories via a bottom system connector with charging and accessory control.
The System blocks provide the MCU and DSP environments, Logic control IC,
memories, audio processing and RF control hardware (RFI2). On board power
supply circuitry (PSCLD) delivers operating voltages for both System and RF
blocks.
The general purpose microcontroller, Hitachi H8, communicates with the DSP,
memories and Logic control IC with an 8–bit data bus.
The RF block is designed for a handportable phone which operates in the GSM
system. The purpose of the RF block is to receive and demodulate the radio
frequency signal from the base station and to transmit a modulated RF signal to
the base station.
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After Sales
NHE–5
Technical Documentation
Block Diagram
RX
RX
DUPLEX
FILTER
SYNTE
SYNTE
TX
TX
IF 13 M
Clk 13 M
AFC
TXC
TXI,TXQ
Transceiver Overview
Display
SYSTEM
ASIC
D151
RFI2
N450
Clk
13 M
SIM
Clk
6.5 M
Clk
13 M
MCU
D150
DSP
D152
M2BUS
AUDIO
N200
RF CONTROL
RF BLOCK
SYSTEM BLOCK
Power Distrubution Diagrams
The power supply is based on the ASIC circuit PSCLD. The chip consists of
regulators and control circuits providing functions like power up, reset and
watchdog functions. External buffering is required to provide more current.
The MCU and the PSCLD circuits control charging together, detection being
carried out by the PSCLD and higher level intelligent control by the MCU. The
MCU measures battery and charger voltages as well as the temperature and
size of the battery via DSP by means of RFI2 internal ADC to sense the condition of the battery.
The detailed power distribution diagrams are given in Baseband blocks and RF
blocks documents.
Clk 512 k, Clk 8 k
Original 06/96
Page 3–5
NHE–5
After Sales
Transceiver Overview
Technical Documentation
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