Dc Characteristics; Regulators - Nokia NPM-6 Series Manual

System Module and User Interface

DC characteristics

Regulators

The transceiver baseband section has a multi function analog ASIC, UEM, which contains
among other functions six pieces of 2.78 V linear regulators and a 4.8 V switching regu-
lator. 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 Helga, 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 Helga. Different modes of operation
can be selected inside the Helga 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
Page 40
Load
PLL charge pump (4.8 V)
TX modulators, ALCs, driver
VCTCXO, synthesizer digital parts
Helga pre-amps, mixers, DtoS
dividers, LO-buffers, prescaler
LNAs, Helga baseband (Vdd_bb)
VCO
ref. voltage for Helga
PA
ãNokia Corporation.
CCS Technical Documentation
Issue 1 01/03