Motorola i897 - Radio Architecture Overview

OVERVIEW: iDEN Digital Modulation Technology
1.3 Radio Architecture Overview
The digital section consists of ZEUS Dual Core Baseband Processor, Host memories (flash and
DDR), and the iDEN power management (See Figure 1- 4 below i897 Block Diagram).
Design Review – Block Diagram
Zeus
BT
BT
Antenna
Sledge-
Hammer
Janus(GPS)
Tri-Band
Antenna
USB 2.0
Controller
USB
Switch
uUSB
Conn
EMU
SOL
SD
Memory
SIM Card
1G NAND
+512M
20-pin
Conn
Display
Serializer
External
SW2
FILT_B+
External
VMMC
FILT_B+
External
SW3
FILT_B+
80-pin
B2B
Conn
POWERRF
MEMORY USB
RR
SW1
V1
V2
V3
V
S
IM
V
_
VIB
FILT
_
B+
JTAG
Camera, Flash, Cap touch, Lin VIB, I2C, CLI
Keypad, SPI, I2C
MIC, VIB, Earpiece
USB_HS
USB_FS
Brightwater/Aberdeen
Banfi
Audio
Amp
V4
SW3
External
LM2758
FILT_B+
Figure 1-4 i897 Block Diagram
The JANUS front end module contains the RX front end (including switches, SAWs, LNA-Life, and
the RX balun), the GPS front end (including the diplexer, SAW, GPS LNA, GPS balun), the TX
output stage (including the TX balun, power amplifier, low-pass filter, antenna switch). The main
RX VCO module, with all the associated loop filter components, is placed on the radio board.
The SLEDGEHAMMER IC is a multi-band transceiver IC intended to support iDEN and WiDEN
protocols. The Sledgehammer IC contains RF and analog baseband paths for iDEN receive and
transmit, in addition to a GPS receive RF path. The SLEDGEHAMMER IC also contains two RF
synthesizers required to generate local oscillator signals for the iDEN receive and transmit and for
GPS receive, as well as an ESCORT loop required to prevent re-modulation of the transmit signal.
The SLEDGEHAMMER IC, utilizing a higher level of integration, serves as placement to the
TOMAHAWK, Half-Life, GRF2i and JAVELIN ICs. The SLEDGEHAMMER IC is used in
conjunction with the Roadrunner IC which will contain the transceiver signal path data converters
and digital filtering which were previously parts of TOMAHAWK.
The Roadrunner IC provides the entire radio DC distribution, audio functions, and digital portion of the
iDEN transceiver/GPS receiver. The DC distribution will consist of linear and switch mode
regulators.
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6880401P59-O