Rf Power Supply Configuration - Nokia NEM-4 Series Troubleshooting Instructions

CCS Technical Documentation

RF Power Supply Configuration

All power supplies for the RF Unit are generated in the UEM IC (D190). All RF supplies
can be checked either in Mjoelner can or in BB can.
The power supply configuration used is shown in the block diagram below. Values of
voltages are given as nominal outputs of UEM. Currents are typical values.
UEM
VR1A
(4.75V)
(4.7V)
VR2
(2.78V)
VR3
(2.78V)
VR4
(2.78V)
VR5
(2.78V)
VR7
(2.78V)
VIO
(1.8V)
VREF01
(1.35V)
VBAT
Issue 1 09/2003
Company Confidential
Figure 10: RF Power distribution diagram
Copyright  2003 Nokia Corporation
Company Confidential
RF Troubleshooting
Charge Pump Supply : Vddcp(0.5mA)
TX Modulators(85mA), Bias :
Vddtx(8mA)
Mjolner registers: Vdddig(10uA)
Mjoelner mixers: OUTXX (66mA)
VCXO Supply : Vddxo(2.7mA)
BT Buffer (1mA)
RX LNA, RX Mjoner BB :
Vddrxf(7mA), Vddrxbb(30mA)
PLL Supplies : Vddpll(0.5mA), Vddlo
+ Vddpre(36mA)
External VCO supply (13mA)
26MHz Buffer, logic : Vddbbb(0.7mA),
Vddl (1uA)
Bias Reference : VBEXT(-10uA)
PA, Bluetooth
NEM-4
Page 6(b)-61