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The Scientific World Journal
Volume 2013, Article ID 939254, 9 pages
http://dx.doi.org/10.1155/2013/939254
Review Article

The System Power Control Unit Based on the On-Chip Wireless Communication System

1Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an 710119, China
2The Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received 9 March 2013; Accepted 17 April 2013

Academic Editors: D. De Vleeschauwer and B. R. Kumar

Copyright © 2013 Tiefeng Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Currently, the on-chip wireless communication system (OWCS) includes 2nd-generation (2G), 3rd-generation (3G), and long-term evolution (LTE) communication subsystems. To improve the power consumption of OWCS, a typical architecture design of system power control unit (SPCU) is given in this paper, which can not only make a 2G, a 3G, and an LTE subsystems enter sleep mode, but it can also wake them up from sleep mode via the interrupt. During the sleep mode period, either the real-time sleep timer or the global system for mobile (GSM) communication sleep timer can be used individually to arouse the corresponding subsystem. Compared to previous sole voltage supplies on the OWCS, a 2G, a 3G, or an LTE subsystem can be independently configured with three different voltages and frequencies in normal work mode. In the meantime, the voltage supply monitor, which is an important part in the SPCU, can significantly guard the voltage of OWCS in real time. Finally, the SPCU may implement dynamic voltage and frequency scaling (DVFS) for a 2G, a 3G, or an LTE subsystem, which is automatically accomplished by the hardware.