User Guide

CCS Technical Documentation System Module
RH-12/RH-28
Issue 1 02/04 Nokia Corporation Page 41
meallized frame and ground plane of the UI-board.
RF Frequency Plan
RF frequency plan is shown below. The VCO operates at the channel frequency multiplied
by two or four, depending on the frequency band of operation. This means that the base-
band-modulated signals are directly converted up to the transmission frequency and the
received RF signals directly down to the baseband frequency.
Figure 21: RF Frequency Plan
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 regulators can be controlled individually by the 2.78 V logic directly or through a con-
trol register.
The use of the regulators can be seen in the power distribution diagram, which is pre-
sented in the Figure Power Distribution Diagram below.