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45nm direct battery DC-DC converter for mobile applications

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dc.contributor.advisor Anantha P. Chandrakasan. en_US Bandyopadhyay, Saurav en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. en_US 2010-12-06T17:29:38Z 2010-12-06T17:29:38Z 2010 en_US 2010 en_US
dc.description Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010. en_US
dc.description Includes bibliographical references (p. 65-66). en_US
dc.description.abstract Portable devices use Lithium-ion batteries as the energy source due to their high energy density, long cycle life and low memory effects. With the aggressive downscaling of CMOS, it is becoming increasingly difficult to efficiently interface the low voltage, low power digital baseband and DSP of the mobile phone with the battery which maybe at voltages as high as 4.2V. This is efficiently done by a DC-DC converter which is a separate IC designed on an older generation process capable of handling high voltages. However, this requires an extra IC, thereby increasing the overall system cost. Here, a buck converter is demonstrated on a standard 45nm digital CMOS process which can be integrated with the 45nm digital core on the same die. This converter is capable of handling high battery voltages (2.8V to 4.2V) and delivers a regulated low voltage (0.5V to 1.1V) to the digital core. The converter can supply 20[mu]A to 100mA of load current. The peak efficiency of the converter is 87% for 73mW output at 4.2V supply and for the ultra low power levels, efficiency of 75% is obtained for a 20[mu]W load at 3V. Both pulse width modulation (PWM) and pulse frequency modulation (PFM) modes of control are used. A new digital pulse width modulator (DPWM) architecture is presented which provides 75% area savings over the conventional delay line and counter based architecture with comparable power consumption. The buck converter also requires Switched Capacitor (SC) DC-DC Converters to generate stacking regulators and regulator for the control circuitry. On the whole, the complete system integrates the Power Management Unit with the core for a single chip radio in 45nm. en_US
dc.description.statementofresponsibility by Saurav Bandyopadhyay. en_US
dc.format.extent 66 p. en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri en_US
dc.subject Electrical Engineering and Computer Science. en_US
dc.title 45nm direct battery DC-DC converter for mobile applications en_US
dc.title.alternative Forty five nm direct battery Direct Current-Direct Current converter for mobile applications en_US
dc.type Thesis en_US S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. en_US
dc.identifier.oclc 681408033 en_US

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