u-blox LEXI-R422, System Integration Manual

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LEXI-R422 - System integration manual
UBX-23007449 - R02 System description Page 16 of 108
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1.5.1.1 VCC supply requirements
Table 6 summarizes the requirements for the VCC modules supply. See section 2.2.1 for suggestions
to correctly design a VCC supply circuit compliant with the requirements listed in Table 6 .
⚠
The supply circuit affects the RF compliance of the device integrating LEXI-R422 modules with
applicable required certification schemes as well as antenna circuit design. RF performance is
optimized by fulfilling the requirements summarized in the
Table 6 .
Item Requirement Remark
VCC nominal voltage Within VCC normal operating range:
3.2 V / 4.5 V
Operating within 3GPP / ETSI specifications: RF
performance is optimized when
VCC PA voltage is
inside the normal operating range limits.
VCC voltage during
normal operation
Within VCC extended operating range:
3.0 V / 4.5 V
Operating with possible slight deviation in RF
performance outside normal operating range.
VCC voltage must be above the extended operating
range minimum limit to switch-on the module and to
avoid possible switch-off of the module.
Operation above
VCC extended operating range is not
recommended and may affect device reliability.
VCC average current Support with adequate margin the highest
averaged VCC current consumption value in
connected mode conditions specified in the
LEXI-R422 data sheet
[1]
The maximum average current consumption can be
greater than the specified value according to the
actual antenna mismatching, temperature and
supply voltage.
Section
1.5.1.2 describes current consumption
profiles in connected mode.
VCC peak current Support with adequate margin the highest peak
VCC current consumption value in Tx connected
mode conditions specified in the LEXI-R422 data
sheet
[1]
The maximum peak Tx current consumption can be
greater than the specified value according to the
actual antenna mismatching, temperature and
supply voltage.
Sections
1.5.1.2 and 1.5.1.3 describe current
consumption profiles in connected mode.
VCC voltage drop
during Tx slots
Lower than 400 mV VCC voltage drop directly affects the RF compliance
with applicable certification schemes.
Figure 6 describes VCC voltage drop during 2G Tx
slots.
VCC voltage ripple
during Tx
Noise in the supply pins must be minimized High supply voltage ripple values during RF
transmissions in connected mode directly affect the
RF compliance with the applicable certification
schemes.
VCC under/over-
shoot at start/end
of Tx slots
Absent or at least minimized
VCC under/over-shoot directly affects the RF
compliance with applicable certification schemes.
Figure 6 describes VCC voltage under/over-shoot.
Table 6: VCC modules supply requirements