Baseband Block Introduction

The WT9 module is used in TFE-2 Model C products. The baseband is built around one DSP, System ASIC and the MCU. The DSP performs all speech and GSM related signal processing tasks. The baseband power supply is 3V, except for the A D and D A converters that are the interface to the RF section, and to the comparators in the LAPWRU. The audio codec is a separate device which is connected to both the DSP and the MCU. The audio codec supports the internal audio from line adapter and external audio...

Power Distribution

The power supply is based on the ASIC circuit PSCLD. The chip consists of regulators and control circuits providing functions like automatic power up, reset and watchdog functions. External buffering is required to provide more current. Automatic power up is needed because there is no 'power on' -button on the terminal so whenever power supply is connected to the terminal it will start automatically the power up procedure. If the input voltage is too high or too low, the terminal will...

Circuit Description

The transceiver electronics consists of one integrated Radio Module (RF + System blocks + LA block). System blocks, RF blocks and LA-block are intercon- System Module Technical Documentation nected with PCB wiring. Accessories are connected to the transceiver via a system connector or 2 RJ-11 connectors. The System blocks provide the MCU and DSP environments, Logic control IC, memories, audio processing, RF control hardware (RFI2) and 2 to 4 wire interface for the landline telephone. On board...

Introduction

The TFE-2 Model C is a radio transceiver unit for the GSM network. It is a GSM power class 4 transceiver providing 15 power levels with a maximum output power of 2 W. The transceiver consists of a Radio module (WT9) and assembly parts WT9 is the baseband RF module of TFE-2 Model C transceiver. The WT9 module carries out all the system and RF functions of the transceiver. The system module WT9 is designed for a Fixed Wireless terminal, that operates in the GSM system. The small-size SIM...

Chapter Transceiver Overview Contents

Block Diagram of External Connections Page 2-5 2-11 Power Supply Regulator PSCLD, N300 Page 2-13 PSCLD, N300 External Components Page 2-13 SIM Interface and Regulator in N300 Page 2-14 MCU Access and Wait State Generation Page 2-16 Baseband A D Converter Channels usage Page 2-21 2-23 RF Transmitter Timing and Power Control Page 2-27 Technical Documentation System Module Line Line Adapter Power RF Receiver Frequency Synthesizers RF Pre-Filters RX Interstage First First IF First IF Receiver IF...

Immobilizer hardware

The hardware part of the Immobilizer is implemented around the baseband ASIC, (D400). The main parts are a 74HC00 logic circuit (D410, quad NAND), which is used as a flip-flop, a back-up battery (G410) and a push-button switch (S410). The whole circuitry is described in the following section. The immobilizer uses three I O pins of BART ASIC (D400). Pin 142 is used for writing to the immobilizer and from pin 140 the state of the flip-flop can be read. Pin 141 is connected to GND to indicate the...

Terminal

The TFE-2 Model C is a Fixed Wireless transceiver unit for the GSM 900 network. It is a GSM900 power class 4 transceiver providing 15 power levels with a maximum output power of 2 W. The basic package contains the following products 2. Power supply Euro plug Power supply US plug Power supply UK plug ACW-2 G67512S ACW-2P G6751S5 ACW-2X G6751S6 General Information Technical Documentation

Frequency Synthesizers

The stable frequency source for the synthesizers and base band circuits is a discrete voltage controlled crystal oscillator VCXO. The frequency of the oscillators is controlled by an AFC voltage, which is generated by the base band circuits. The UHF PLL generates the down conversion signal for the receiver and the up conversion signal for the transmitter. The UHF VCO is a discrete oscillator. The working assumption for PLL circuit is Philips UMA1018. The VHF PLL signal divided by 4 in CRFRT is...

RFI N Operation

This means that the RFI2 clock can be switched off and the AFC value will be kept. One of the A D converters used for receiver signal conversion can be used as an auxiliary converter that supplies 8 channels for baseband measurement purposes. When the converter is used in this mode, each conversion generates an interrupt directly to the DSP. The DSP operates this converter via the ASIC D400. Data communication between the ASIC D400 and RFI2 N450 is carried...

MCU Flash Loading

The flash loading equipment is connected to the baseband by means of the service adapter. The power supply for the baseband is supplied via the adapter and controlled by the flash programming equipment. The baseband module is powered up when the power is connected to the power supply connector. Five signals are required for the flash programming, with the addition of the power supply. The baseband MCU will automatically wait for flash downloading to be performed if one of the two following...

Power Supply

Nokia Premicell Serial

VL 3.2V VA 3.2 V VSL 3.2 V The baseband has one power supply circuit N300 delivering power to the different parts in the baseband. There are two logic power supplies and one analog power supply. The analog power supply VA is used for analog circuits such as audio codec. Due to the current consumption and the baseband architecture the digital supply is divided into two parts. Both digital power supplies VSL and VL from the N300 PSCLD are used to distribute the power dissipation inside N300...

Audio Control

The audio codec N130 is controlled by the MCU D420. The ASIC generates a 512 kHz data clock, and a 8 kHz synchronization signal for the PCM data bus. Data is put out on the bus at the rising edge of the clock and read in at the falling edge. Data from the DSP D360 to the audio codec N130 is transmitted as a separate signal from data transmitted from the audio codec, N130 to the DSP D360. The communication is full duplex synchronous. The transmission is started at the falling edge of the...

System Connector X

Nokia Premicell Tfe Rs232

Technical Documentation System Module Serial RX Receive data for serial communication 0 min max 0 0.6 V 1 min max 2.4 3.2 V Serial TX Transmit data for serial communication 0 min max 0 0.6 V 1 min max 2.4 3.2 V Serial Clock Serial Clock for synchronous communication RS RTS 0 min max 0 0.6 V 1 min max 2.4 3.2 V 0 min max 0 0.6 V Watchdog disable, Flash mode 1 min max 2.4 7.15 V, Normal mode Audio Clock 512 kHz clock for audio data 0 min max 0 0.6 V 1 min max 2.4 3.2 V Serial control bus General...