•
Common regulators for GSM and WCDMA
•
Boost and SMPS regulators in Aura
•
Feeding the supply voltage to PA
•
Operation frequency varies depending on the used system
Frequency SMPS Boost DCDC
WCDMA 3.0 MHz (typ) 4.5 MHz (typ) 1.3 MHz (typ)
GSM 9.5 MHz 7.5 MHz 2.7 MHz
•
Digital interface to baseband
•
WCDMA mode
•
Digital IQ interface
•
3 data and 1 clk signals
•
GSM mode
•
GSM TX data bits are sourced from baseband via RFBus to Älli
In GMSK mode, the output level of Älli is kept high with all power levels, and the output power is adjusted
by altering the collector voltage of PA. In practice, the output level of Älli is also slightly changed (optimized)
in the highest power level to keep the PA compression level more constant, which results in better overall
efficiency and performance.
In WCDMA and EDGE mode, the output power is tuned by output level of Älli. The supply voltage in WCDMA
mode is adjusted in power levels to optimize the current consumption.
RM-596
System Module
Page 6 – 34 COMPANY CONFIDENTIAL Issue 2
Copyright © 2010 Nokia. All rights reserved.
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