Name: Fibocom L850-GL Series
Brand: Fibocom
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FIBOCOM L850-GL Series Hardware Guide Page 21 of 59

Figure 3-2 Power supply design

The filter capacitor design for power supply is shown in the following table:

Recommended

Capacitance

Application Description

220uF×2

Voltage-stabilizing

capacitors

Reduce power fluctuations of the module in

operation, requiring capacitors with low ESR.

 LDO or DC/DC power supply requires the

capacitor of no less than 440uF

 The capacitor for battery power supply can be

reduced to 100~200uF

1uF, 100nF Digital signal noise

Filter out the interference generated from the clock

and digital signals

39pF, 33pF

700/800, 850/900 MHz

frequency band

Filter out low frequency band RF interference

18pF, 8.2pF,

6.8pF

1500/1700/1800/1900,

2100/2300, 2500/2600MHz

frequency band

Filter out medium/high frequency band RF

interference

The stable power supply can ensure the normal operation of L850 module; and the ripple of the power

supply should be less than 300mV in design. When the module operates with the maximum emission

power, the maximum operating current can reach 1.5A, so the power source should be not lower than

3.135V, or the module may shut down or reboot. The power supply limits are shown in Figure 3-3:

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Fibocom L850-GL Series Specifications

General