Dc Characteristics; Power Distribution Diagram; Power Distribution Diagram; Regulators - Nokia NKC-1X Series Technical Documentation Manual

NKC-1X
System Module

DC Characteristics

Power Distribution Diagram

Note: The current values in the figure above are not absolute values and cannot bemea-
sured. These values represent maximum/typical currents drawn by the corresponding RF
or TACO blocks in use, and are, therefore, dependent on the phone's operating mode and
state.

Regulators

The regulator circuit is the UEM and the specifications can be found in the table below:
Regulator name
VR1 a/b
VR2
VR3
VR4
VR5
VR7
IPA
VREFRF01
VFLASH1

Receiver

The receiver shows a superheterodyne structure with zero 2nd IF. Most of the receiver
functions are integrated in the RF ASIC. The only functions out of the chip are duplexers
and SAW filters. I
An active 1st downconverter sets naturally high gain requirements for preceding stages.
Hence, losses in very selective frontend filters are minimized down to the limits set by
filter technologies used and component sizes. LNA gain is set up to 16dB, which is close
to the maximum available stable gain from a single stage amplifier. LNAs are not exactly
noise matched in order to keep passband gain ripple in minimum. Filters have relative
tight stopband requirements, which are not all set by the system requirements but the
interference free operation in the field. In this receiver structure, linearity lies heavily on
mixer design. The 2nd order distortion requirements of the mixer are set by the 'half IF'
suppression. A fully balanced mixer topology is required. Additionally, the receiver 3rd
order IIP tends to depend on active mixer IIP3 linearity due to pretty high LNA gain.
IF stages include a narrowband SAW filter on the 1st IF and an integrated lowpass filter-
Page 48
Figure 12: Power distribution diagram
Table 22: Regulator specifications
Output voltage (V)
4.75 ± 3%
2.78 ± 3%
2.78 ± 3%
2.78 ± 3%
2.78 ± 3%
2.78 ± 3%
2.7 max.
1.35 ± 0.5%
2.78 ± 3%
Nokia Corporation
CCS Technical Documentation
Regulator Max. RF total
current (mA) 1GHz
10 4
100 100
20 2
50 23
50 5
45 40
1 ± 10% 1.3 – 5.0
3 ± 4%
3.5 ± 4%
5 ± 3%
0.12 0.05
70 1
RF total 2GHz
4
76
2
24
5
45
1.3 – 3.7
0.05
1
Issue 1 02/03