1. A 233-MHz 80%-87% efficient four-phase DC-DC converter utilizing air-core inductors on package
- Author
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Jae-Hong Hahn, Siva G. Narendra, Vivek De, B. Bloechel, Tanay Karnik, Donald S. Gardner, Gerhard Schrom, P. Hack, S. Borkar, G. Dermer, and Peter Hazucha
- Subjects
Engineering ,business.industry ,Buck converter ,Ćuk converter ,Electrical engineering ,Buck–boost converter ,Hardware_PERFORMANCEANDRELIABILITY ,Decoupling capacitor ,Inductor ,law.invention ,Capacitor ,law ,Boost converter ,Hardware_INTEGRATEDCIRCUITS ,Electronic engineering ,Electrical and Electronic Engineering ,business ,Decoupling (electronics) - Abstract
We demonstrate an integrated buck dc-dc converter for multi-V/sub CC/ microprocessors. At nominal conditions, the converter produces a 0.9-V output from a 1.2-V input. The circuit was implemented in a 90-nm CMOS technology. By operating at high switching frequency of 100 to 317 MHz with four-phase topology and fast hysteretic control, we reduced inductor and capacitor sizes by three orders of magnitude compared to previously published dc-dc converters. This eliminated the need for the inductor magnetic core and enabled integration of the output decoupling capacitor on-chip. The converter achieves 80%-87% efficiency and 10% peak-to-peak output noise for a 0.3-A output current and 2.5-nF decoupling capacitance. A forward body bias of 500 mV applied to PMOS transistors in the bridge improves efficiency by 0.5%-1%.
- Published
- 2005
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