Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 47, Issue 8, Pages 1935-1945Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2012.2196316
Keywords
DC-DC power conversion; integrated voltage regulator (IVR); voltage regulator (VR); switched inductor; Buck converter; switching-converter; nonlinear feedback; hysteretic control; transient response
Categories
Funding
- Department of Energy [DE-EE0002892]
- National Science Foundation [ECCS-0903466]
- C2S2 Center, part of the Focus Center Research Program
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0903466] Funding Source: National Science Foundation
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A four-phase integrated buck converter in 45 nm silicon-on-insulator (SOI) technology is presented. The controller uses unlatched pulse-width modulation (PWM) with nonlinear gain to provide both stable small-signal dynamics and fast response (similar to 700 ps) to large input and output transients. This fast control approach reduces the required output capacitance by 5 in comparison to a conventional, latched PWM controller at a similar operating point. The converter switches package-integrated air-core inductors at 80 MHz and delivers 1 A/mm(2) at 83% efficiency and 0.66 conversion ratio. A network-on-chip (NoC) serves as a realistic digital load along with a programmable current source capable of generating load current steps with slew rate of similar to 1 A/100 ps for characterization of the control scheme.
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