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
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