Motorola Mobility LLC T56KT1 User Manual
Power Supply
12
G30 - Module Hardware Description
December 15, 2009
Power Supply
The G30 power supply must be a single external DC voltage source of 3.3V to 4.2V. The power
supply must be able to sustain the voltage level during a GSM transmit burst current surge, which
may reach 2.0A.
supply must be able to sustain the voltage level during a GSM transmit burst current surge, which
may reach 2.0A.
The G30 interface contacts for the main power supply, are described in
. All these
contacts must be used for proper operation.
Power Supply Design
Special care must be taken when designing the power supply of the G30. The single external DC
power source indirectly supplies all the digital and analog interfaces, but also directly supplies the
RF power amplifier (PA). Therefore, any degradation in the power supply performance, due to
losses, noises or transients, will directly affect the G30 performance.
power source indirectly supplies all the digital and analog interfaces, but also directly supplies the
RF power amplifier (PA). Therefore, any degradation in the power supply performance, due to
losses, noises or transients, will directly affect the G30 performance.
The burst-mode operation of the GSM transmission and reception, draws instantaneous current
surges from the power supply, which causes temporary voltage drops of the power supply level.
The transmission bursts consume the most instantaneous current, and therefore cause the largest
voltage drop. If the voltage drops are not minimized, the frequent voltage fluctuations may
degrade the G30 performance.
surges from the power supply, which causes temporary voltage drops of the power supply level.
The transmission bursts consume the most instantaneous current, and therefore cause the largest
voltage drop. If the voltage drops are not minimized, the frequent voltage fluctuations may
degrade the G30 performance.
Table 2-2: Power Supply Signals
Pin #
(LGA interface)
Pin #
(70 pin
connector
interface)
Signal Name
Description
65, 67-77
1-4
GND
Main ground connection for G30
module.
module.
78, 79
5-8
VCC
DC supply input for G30 module.
V
V
IN
= 3.3 V to 4.2 V
I
RMS
= 350 mA during multislot
transmission
I
I
MAX
= 2 A during transmit
bursts