TOBY-L4 series - System Integration Manual
UBX-16024839 - R04
System description
Page 23 of 143
1.5.1.1
VCC supply requirements
Table 7 summarizes the requirements for the
VCC
modules supply. See section 2.2.1 for suggestions on how to
properly design a
VCC
supply circuit compliant with the requirements listed in Table 7.
The supply circuit affects the RF compliance of the device integrating TOBY-L4 series modules
with applicable required certification schemes as well as antenna circuit design. Compliance is
guaranteed if the requirements summarized in Table 7 are fulfilled.
Item
Requirement
Remark
VCC
nominal voltage
Within
VCC
normal operating range:
3.40 V min. / 4.40 V max.
RF performance is guaranteed when
VCC
PA voltage is
inside the normal operating range limits.
RF performance may be affected when
VCC
PA voltage is
outside the normal operating range limits, though the
module is still fully functional until the
VCC
voltage is
inside the extended operating range limits.
VCC
voltage during
normal operation
Within
VCC
extended operating range:
3.00 V min. / 4.50 V max.
VCC
voltage must be above the extended operating range
minimum limit to switch-on the module.
The module may switch-off when the
VCC
voltage drops
below the extended operating range minimum limit.
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
The maximum average current consumption can be
greater than the specified value according to the actual
antenna mismatching, temperature and supply voltage.
Sections 1.5.1.2, 1.5.1.3 and 1.5.1.4 describe the current
consumption profiles in 2G, 3G and LTE connected modes.
VCC
peak current
Support with margin the highest peak
VCC
current
consumption value in connected mode conditions
The specified maximum peak of current consumption
occurs during the GSM single transmit slot in 850/900
MHz connected mode, in case of a mismatched antenna.
Section 1.5.1.2 describes 2G Tx peak/pulse current.
VCC
voltage drop
during 2G Tx slots
Lower than 400 mV
Supply voltage drop values greater than recommended
during 2G TDMA transmission slots directly affect the RF
compliance with the applicable certification schemes.
Figure 5 describes supply voltage drop during 2G Tx slots.
VCC
voltage ripple
during 2G/3G/LTE Tx
Noise in the supply must be minimized
High supply voltage ripple values during LTE/3G/2G RF
transmissions in connected mode directly affect the RF
compliance with applicable certification schemes.
Figure 5 describes supply voltage ripple during RF Tx.
VCC
under/over-shoot
at start/end of Tx slots
Absent or at least minimized
Supply voltage under-shoot or over-shoot at the start or
the end of 2G TDMA transmission slots directly affect the
RF compliance with the applicable certification schemes.
Figure 5 describes supply voltage under/over-shoot
Table 7: Summary of VCC modules supply requirements
