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Nokia RM-70 User Manual

Nokia RM-70
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Ahne RF ASIC (application specific integrated circuit)
Front end module (FEM) module (Power amplifier and Antenna switch)
The RF engine also includes:
Voltage controlled oscillators (VCO and VCTCXO)
SAW filters
The baseband section controls the RF module through the serial bus, RFBus. This passes information about
eg. frequency band and mode of operation. Ahne RF ASIC controls the mode of operation, and further sends
control signals to the front end module.
In addition to the RFBus there are other interface signals for the power control loop, VCTCXO control and for
the modulated waveforms.
Main processor
The main processor in this device is RAPGSM, a BB5.0 ASIC.
Some of its interfaces, processors and controllers are:
General purpose UARTs
Processor modules
I2C (between ICs) interface
GSM coder
Interfaces to user interface, SIM and MMC
Accessory interface
Handling of RF-BB interface
I/O voltage = 1.8 V, Core voltage <1.8 V
Energy management
Two ASICs manages the energy in the phone; Retu and Tahvo. Together they cover the analogue audio and
energy management function needs.
Tahvo
All blocks that need a special silicon process are included in Tahvo.
Tahvos main features are:
Energy management control
Supply voltage generation
Charge control
Digital core supply
Current control for LED supply
Retu
The blocks that do not have special needs are included in Retu.
Retu controls for example:
Audio block
SIM
FM radio
RM-70
System module Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 8 –9
Copyright © 2005 Nokia. All rights reserved.

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Nokia RM-70 Specifications

General IconGeneral
BrandNokia
ModelRM-70
CategoryCell Phone
LanguageEnglish

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