Error! No text of specified style in document. - System Integration Manual
CDMA-2X-11004-P1
Objective Specification
System description
Page 13 of 79
5.1
Architecture
Wireless
Base-band
Processor
M emory
Pow er M anagement Unit
RF
Transceiver
19.2 MHz
32.768 kHz
SAW
Filter
Diplexer
ANT
LNA
3G PA
LNA
3G PA
UART
USB
GPIOs (* * )
Power On
HW Reset (* * )
Vcc (Supply)
V_INT (I/O)
Digital and
analog voice (* * )
HW shutdown (* )
(*): FW75
(**): LISA-C200
Figure 1: Block diagram
5.1.1
Functional blocks
Error! No text of specified style in document. modules consist of the following internal functional
blocks: RF front-end, RF transceiver, Baseband section and Power Management Unit.
RF Front-End
The Antenna connector is directly connected to the Diplexer which separates the 800 and 1900
MHZ bands. Each 800 & 1900 MHz RF chain are connected to their respective transceiver paths via
duplexers as shown in prior block diagram.
Each duplexer provides the filtering and Rx/Tx path separation before connecting to the LNA and
RF PA devices.
A separate shield compartment houses the 800 MHZ and 1900 MHZ RF power amplifiers. This
compartment provides high Tx signal isolation, preventing de-sensing of the Rx frontend circuitry.
RF Transceiver
The transceiver includes the following key components:
Dual-band 800 & 1900 MHz CDMA transceiver, excluding the RF Power Amplifiers, duplexers and
diplexer.
19.2 MHz Crystal Oscillator
While operating, the RF transceiver performs direct up-conversion and down-conversion of the
baseband I/Q signals, with the RF voltage controlled gain amplifier being used to set the uplink TX
