Dc Characteristics; Regulators - Nokia NPL-4 Series Manual

NPL-4/5/RM-104
System Module and User Interface

DC characteristics

Regulators

The transceiver baseband section has a multi function analog ASIC, UEMEK, which con-
tains among other functions six pieces of 2.78 V linear regulators and a 4.8 V switching
regulator. All the regulators can be controlled individually by the 2.78 V logic directly or
through a control register. Normally, direct control is needed because of switching speed
requirement: the regulators are used to enable the RF-functions which means that the
controls must be fast enough.
The seven regulators are named VR1 to VR7. VrefRF01 is used as the reference voltages
for the Helgo, VrefRF01 (1.35V) for the bias reference and for the RX ADC (analog-to-
digital converter) reference.
The regulators (except for VR7) are connected to the Helgo. Different modes of operation
can be selected inside the Helgo according to the control information coming through
the RFBus.
List of the needed supply voltages
Volt. source
VR1
VR2
VR3
VR4
VR5
VR6
VR7
VrefRF01
Vbatt
Copyright © 2005 Nokia Corporation. All rights reserved.
Page 78
Load
PLL charge pump (4.8 V)
TX modulators, ALCs, driver
VCTCXO, synthesizer digital parts
Helgo pre-amps, mixers, DtoS
dividers, LO-buffers, prescaler
LNAs, Helgo baseband (Vdd_bb)
VCO
ref. voltage for Helgo
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Issue 2 05/05