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3.2.8. Power Amplifier
The RF3133 [U504] is a triple-band GSM/DCS/PCS power amplifier module that incorporates an
indirect closed loop method of power control. The indirect closed loop is fully self-contained and it
does not require loop optimization. It can be driven directly from the DAC output in the baseband
circuit. On-board power control provides over 37 dB of control range with an analog voltage input
(Vramp). Efficiency is 55% at GSM and 52% at DCS.
3.2.9. 13MHz Clock
The 13 MHz clock(U506) consists of a TCXO(Temperature Compensated Crystal Oscillator) which
oscillates at a frequency of 13 MHz. It is used within the Si4133T/Si4201 RF Main Chip, BB Analog
chip-set(IOTA), Digital chip-set(Calypso G2).
Figure 4. Power Amp
Figure 5. VC-TCXO Circuit
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