Baseband Electrical Interfaces: Bt Module; Rf System Module; Overview; Rf General Description - Nokia RM-761 Service Manual

RM-761; RM-799; RM-800
System Module

Baseband electrical interfaces: BT module

The BTRDS device is interfaced to the Quantum engine. An asynchronous serial interface with HW flow control
implemented on the XGold213 USIF1 HW block provides the control/data interface, with optional digital audio
data interface provided with an I2S interface. The interface furthermore supports a bidirectional wake up
mechanism through dedicated signals UART_WAKE and BT_WAKEUP in. The Quantum engine also provides a
32 kHz sleep clock output and a 26MHz main clock to the BTRDS device. Activation of the 26MHz can be
requested by the BTRDS device by asserting the BT_CLK_REQ signal.
Figure 68 BT circuits

RF System Module

Overview

This Chapter contains a brief introduction to the design of the RF part for the Quantum engine block in order
to give the maintenance operator a good knowledge of the RF HW for making debugging and troubleshooting
easier.
The assumption is that the service centre is equipped according to the Nokia's Level 3 as described in
"Recommended service equipment, for authorized Nokia service suppliers" Version 30, 01 Nov. 2009 by
Nokia.

RF general description

The RF part of the Quantum engine is a 2G block using the Infineon X-GOLD213 IC RF sub-system as the RF
transceiver module, which supports dual-band GSM voice and data applications (GPRS class 10 with the
feature of RX EGPRS capability). It also supports 2 different Front End Modules, FEM, (Renesas EU and Skyworks
EU) includes both dual-band power amplifiers and antenna switch for RX/TX path switching functionalities.
The 26MHz reference clock is generated by a build-in digitally adjustable oscillator with one off-chip crystal.
Furthermore the engine supports FM radio functionality with an on-chip FM radio block. The external circuitry
needed for the FM radio is the LNA and the antenna. BT is also supported with an external BT chipset.

Frequency plan

Quantum is a dual band engine, which supports either EU version or US version frequency bands. The
frequency plan and power class are shown in the following table.
Page 5 – 24 COMPANY CONFIDENTIAL Issue 1
Copyright © 2011 Nokia. All rights reserved.