FR1: BW 100MHz, Inner RB 137(Number)@64(Position),
QPSK DL / QPSK UL, 23 dBm
* Loop-back mode in call equipment
* 3.3 voltage/room temperature
Note: Worst/best-case current consumption values depend on mobile network
configuration – not under module control.
5.3 General Design Rule
The principal guidelines for the Power Supply Design include three different design steps:
•
Electrical design
•
Thermal design
•
PCB layout
Electrical Design Guidelines
The electrical design of the power supply is highly dependent on the power source from
which the power is drained.
+5v Source Power Supply Design Guidelines
•
The desired power supply voltage output is 3.3V. Being the difference
between the input source and the desired output moderate, a linear
regulator can be used. A switching power supply is preferred to reduce
power dissipation.
•
When using a linear regulator, a proper heat sink must be provided to
dissipate the power generated.
•
A low ESR bypass capacitor of adequate capacity must be provided to cut
the current absorption peaks close to the FN990 Family module. A 100 μF
tantalum capacitor is usually suitable on VPH_PWR.
•
Make sure that the low ESR capacitor on the power supply output (usually a
tantalum one) is rated at least 10V.
•
A protection diode must be inserted close to the modem power input to
protect the FN990 Family module from power polarity inversion.
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