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L810-MiniPCIeHardware User Manual
Page 13 of 26
3.4 Power Supply Filtering
Filter capacitor for the supply circuit of 3.3VAUX can be designed as follows:
Recommended
capacitance
Application
Description
330uF
Capacitor for power supply
To reduce the power supply
fluctuation during call
1uF,100nF
Digital signal noise
To filter out the interference from
clock and digital signals
39pF,33pF
700MHz, 850/900MHz frequency band
To filter out the radio-frequency
interference
18pF,8.2pF,
6.8pF
1700/1800/1900MHz, 2100/2300MHz,
2500/2600MHz frequency band
To filter out the radio-frequency
interference
3.5 Power Consumption
Please refer to the Module’s Hardware User Guide for the details.
GSM system adopts non-continuous emission method, which is 217Hz bursts and the maximum current
will reach 2A. In case of circuit design, the power drop should be considered and withstand the maximum
2A current. In case of PCB design, the width of the power traces must be sufficient to support the
maximum current. If the design requirements are not followed, the module might shutdown while it is
working.
