HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 43 of 111 2019-11-25
The GSM system is made in a way that the RF transmission is not continuous, else it is
packed into bursts at a base frequency of about 216 Hz, and the relative current peaks
can be as high as about 2A. Therefore the power supply has to be designed in order to
withstand with these current peaks without big voltage drops; this means that both the
electrical design and the board layout must be designed for this current flow. If the layout
of the PCB is not well designed a strong noise floor is generated on the ground and the
supply; this will reflect on all the audio paths producing an audible annoying noise at 216
Hz; if the voltage drop during the peak current absorption is too much, then the device
may even shutdown as a consequence of the supply voltage drop.
NOTE:
The electrical design for the Power supply should be made ensuring
it will be capable of a peak current output of at least 2 A.
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