3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
3.1 Transceiver (SI4205-BM, U500)
The RF parts consist of a transmitter part, a receiver part, a frequency synthesizer part, a
voltagesupply part, and a VCTCXO part.
The Aero I transceiver is the integrated RF front end for multi-band GSM/GPRS digital cellular
handsets and wireless data modems. The integrated solution eliminates the IF SAW filter, external
low noise amplifier (LNAs) for three bands, transmit and RF voltage controlled oscillator(VCO
modules, and other discrete components found in conventional designs.
Figure 3-1 RECEIVER FUNCTIONAL BLOCK DIAGRAM
H
C
TI
W
S
A
N
N
E
T
N
A
TCXO
Summary of Contents for B2070
Page 68: ... 67 4 TROUBLE SHOOTING TEST POINT 4 6 LCD Trouble ...
Page 72: ... 71 4 TROUBLE SHOOTING TEST POINT 4 8 Speaker Trouble ...
Page 79: ... 78 4 TROUBLE SHOOTING 4 11 KEY backlight Trouble TEST POINT ...
Page 107: ... 106 8 PCB LAYOUT Figure 8 1 B2070 BOTTOM SIDE PCB LAYOUT ...
Page 108: ... 107 8 PCB LAYOUT Figure 8 1 B2070 TOP SIDE PCB LAYOUT ...
Page 109: ... 108 ...
Page 117: ...10 STAND ALONE TEST 116 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 121: ... 120 ...
Page 123: ... 122 ...