3. TECHNICAL BRIEF
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3.1 Transceiver (SI4210, U401)
The RF parts consist of a transmitter part, a receiver part, a digitally-controlled crystal oscillator.
The Aero® II transceiver is a complete RF front end for multi-band GSM and GPRS wireless
communications. The receive section interfaces between the RF band-select SAW filters and the
baseband subsystem. The Aero II receiver leverages a proven digital low-IF architecture and enables
a universal baseband interface without the need for complex dc offset compensation. The transmit
section of Aero II provides a complete upconversion path from the baseband subsystem to the power
amplifier (PA) using an offset phase-locked loop (OPLL) integrated with Silicon Laboratories’ patented
synthesizer technology. All sensitive components, such as TX/RF VCOs, loop filters, tuning inductors,
and varactors are completely integrated into a single integrated circuit. The Aero II transceiver includes
a digitallycontrolled crystal oscillator (DCXO) and completely integrates the reference oscillator and
varactor functionality.
3. TECHNICAL BRIEF
Figure. 3-1 SI4210 TRANSCEIVER BLOCK DIAGRAM
Содержание KG320
Страница 1: ...Date May 2006 Issue 1 0 Service Manual Model KG320 Service Manual KG320 ...
Страница 3: ... 4 ...
Страница 20: ...3 TECHNICAL BRIEF 21 Figure 3 5 SKY77328 FUNCTIONAL BLOCK DIAGRAM ...
Страница 39: ...3 TECHNICAL BRIEF 40 3 7 CAMERA IC AIT811T U103 Figure 3 18 AIT811T APPLICATION BLOCKDIAGRAM ...
Страница 41: ...3 TECHNICAL BRIEF 42 3 8 MIDI IC YMU787 U202 Figure 3 20 YMU787 BLOCKDIAGRAM ...
Страница 59: ...4 2 TX Trouble 4 TROUBLE SHOOTING 60 SKY7477328 FEM 26Mhz OSCILLATOR SI4210 TEST POINT Figure 4 2 ...
Страница 72: ...4 TROUBLE SHOOTING 73 4 6 LCD Trouble AIT811T EMI FILTER CN102 TEST POINT Figure 4 6 ...
Страница 77: ...4 TROUBLE SHOOTING 78 Graph 4 10 a BLUE RST Graph 4 10 b DEBUG_TX RX Graph 4 10 c PCM_SYNCS TX RX USC0 ...
Страница 90: ...4 TROUBLE SHOOTING 91 4 14 Camera and Flash Trouble Camera Module U201 CN202 Figure 4 17 ...
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Страница 107: ... 108 8 PCB LAYOUT ...
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Страница 121: ...10 STAND ALONE TEST 122 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
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