3. H/W Circuit Description
3.1 RF Transceiver General Description
The RF parts consist of a transceiver part, a power amplifier part, a front-end module part, a voltage
supply part, and a VC-TCXO part.
The Aero
TM
I
transceiver is composed of single RF chipset, Si4205-BM[U803] which is a triple and
quad-band GSM/GPRS wireless communications.
This device integrated a receiver based on a low IF (100KHz) architecture and a transmitter based on
modulation loop architecture. The transceiver employed a 3 wire serial interface to allow an external
system controller to write the control registers for dividers, receive path gain, power down setting, and
other controls.
3.2 Receiver Part
The receiver part uses a low-IF receiver architecture that allows for the on-chip integration of the
channel selection filters, eliminating the external RF image reject filters and the IF SAW filter required
in conventional super-heterodyne architecture. The Si4205-BM[U803] integrates three differential
input LNAs that are matched to the 150 Ohm balanced-output SAW filters through external LC
matching networks.
A quadrature image-rejection mixer downconverts the RF signal to a 100kHz intermediate frequency
(IF) with the RFLO from the frequency synthesizer. The mixer output is amplified with an analog
programmable gain amplifier (PGA) and quadrature IF signal is digitized with high resolution A/D
converters (ADCs).
The Si4205-BM[U803] downconverts the ADC output to baseband with a digital 100kHz quadrature
LO signal. Digital decimation and IIR filters perform channel selection to remove blocking and
reference interference signals. After channel selection, the digital output is scaled with digital PGA,
which is controlled with the DGAIN[5:0] bits in register 05h. The amplified digital output signal go
through with DACs that drive a differential analog signal onto the RXIP,RXIN,RXQP and RXQN pins
to interface to standard analog ADC
input baseband ICs.
-12-
Antenna Bar Number
Rx Power (dBm)
Antenna Display
5
→
4
-85dBm
±
2dBm
4
→
3
-90dBm
±
2dBm
3
→
2
-95dBm
±
2dBm
2
→
1
-100dBm
±
2dBm
1
→
0
-105dBm
±
2dBm
Содержание L1100
Страница 1: ...Service Manual Model L1100 Service Manual L1100 P N MMBD0032801 Date June 2004 Issue 1 0 ...
Страница 31: ... 30 Figure 14 Power Supply Scheme ...
Страница 46: ... 45 Figure 25 CLC344E Camera Chip Circuit ...
Страница 49: ... 48 Figure 28 Camera Module Circuit MAIN BOARD FPCB ...
Страница 62: ...4 9 Microphone Trouble 61 Circuit Diagram ...
Страница 82: ... 81 U602 FPCB CN2 1 3 U601 5 4 Test Points 1 20 2 19 ...
Страница 88: ...Checking ANT SW Mobile SW 2 Rx pass continued 87 SW801 ANT Pin 2 VC2 SW801 RF Pin 7 VC1 Pin5 VC3 U801 FL801 ...
Страница 97: ...Checking ANT SW Mobile SW 2 Tx pass continued 96 Pin 2 VC2 SW801 RF Pin 7 VC1 Pin5 VC3 U801 FL801 SW801 ANT ...
Страница 98: ...5 1 Disassembly 5 ASSEMBLY INSTRUCTION 97 2 1 1 2 ...
Страница 99: ...98 1 2 3 2 1 ...
Страница 100: ... 99 1 2 3 ...
Страница 101: ... 100 ...
Страница 103: ...6 2 Download Procedure 1 Execute Fluid_GUI exe and select Erase Program flash menu 104 ...
Страница 104: ...2 Click the Add button Then choose m0 file which is going to download 105 ...
Страница 106: ...4 Press Global Settings menu Choose a correct serial port and set the configuration as below 107 ...
Страница 108: ...6 Wait for downloading to be finished 109 ...
Страница 125: ... 127 9 PCB LAYOUT ...
Страница 126: ... 128 9 PCB LAYOUT ...
Страница 129: ... 131 12 EXPLODED VIEW REPLACEMENT PART LIST 12 1 EXPLODED VIEW ...