User Guide

PAMS
Transceiver
NHB–3
Technical Documentation
Original 26/97
Page 3–5
Functional Description
Circuit Description
The transceiver electronics consist of the Radio Module (RF + System blocks)
and the UIF Module. The UIF Module is connected to the Radio Module with a
connector. 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
(D2CA), memories, audio processing and RF control hardware (RFI). On board
power supply circuitry delivers operating voltages for both System and RF
blocks.
The general purpose microcontroller, Hitachi H8, communicates with the DSP,
memories and Logic control IC (D2CA) with an 8–bit data bus.
The RF block is designed for a handportable phone which operates in the
DCS1900 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.
Block Diagram
AUDIO
DSP
RFI
UIF
MCU
RX
SYNTE
TX
SYSTEM
ASIC
AFC
TXI,TXQ
TXC
DUPLEX
FILTER
IF 13 M
Clk 26 M
Clk
13 M
RF CONTROL
Clk
26 M
Clk 512 k, Clk 8 k
M2BUS
DBUS
RF BLOCK
SYSTEM BLOCK
D2CA
RX
SYNTE
TX
UIM