NKC-1X
System Module
CCS Technical Documentation
Page 48
Nokia Corporation
Issue 1 02/03
DC Characteristics
Power Distribution Diagram
Figure 12: 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:
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-
Table 22: Regulator specifications
Regulator name
Output voltage (V)
Regulator Max.
current (mA)
RF total
1GHz
RF total 2GHz
VR1 a/b
4.75 ± 3%
10
4
4
VR2
2.78 ± 3%
100
100
76
VR3
2.78 ± 3%
20
2
2
VR4
2.78 ± 3%
50
23
24
VR5
2.78 ± 3%
50
5
5
VR7
2.78 ± 3%
45
40
45
IPA
2.7 max.
1 ± 10%
3 ± 4%
3.5 ± 4%
5 ± 3%
1.3 – 5.0
1.3 – 3.7
VREFRF01
1.35 ± 0.5%
0.12
0.05
0.05
VFLASH1
2.78 ± 3%
70
1
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