Extend the battery power of a handset with one simple IC

Murphy, Eva; Goggin, Ray
January 2006
Portable Design;Jan2006, Vol. 12 Issue 1, p27
This article focuses on extending the battery power of cell phones. It is the goal of every handset designer to decrease the power and extend the battery lifetime of cell phones. One way of reducing power consumption is to move the major chips of the handset, such as the analog and digital baseband chips, to a lower voltage. Quite often, the extra features in the smartphone needs higher voltages. A problem occurs at the interface between the baseband and polyphonic ringtone circuitry. Driving the analog switch with the lower voltage digital logic from the baseband chip could cancel the power savings obtained from using lower supply voltages on the baseband chips, since the switch would operate inefficiently and draw significant amount of current. One solution to this problem is to level-translate the digital logic from the baseband circuitry, thereby maintaining the power savings of using 1.8 V for the baseband chips. To know more about why one would need a level translator, one needs to look at where the current is actually flowing.


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