A High-Efficiency On-Chip DC-DC Down-Conversion Using Selectable Supply-Voltage Charge-Recycling

Byung-Do YANG  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E94-A   No.12   pp.2676-2684
Publication Date: 2011/12/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E94.A.2676
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Circuit Design
Keyword: 
charge-recycling,  DC-DC conversion,  low power,  on-chip,  

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Summary: 
This paper proposes a high-efficiency on-chip DC-DC down-conversion technique using selectable supply-voltage charge-recycling. This technique converts an external high supply-voltage (2VDD) to an on-chip low supply-voltage (VDD) by using charge-recycling. It partitions the original logic using VDD into high logic (H-logic) and low logic (L-logic), consuming nearly the same amount of power. The H-logic uses a higher supply-voltage (2VDD and VDD). The L-logic uses a lower supply-voltage (VDD and ground). The charge used in the H-logic is recycled in the L-logic. In order to reduce a charge mismatch between the H-logic and the L-logic, this scheme dynamically changes the ratio between the H-logic and the L-logic by selecting the supply-voltages used by the divided logic blocks. To verify the DC-DC down-conversion using the proposed charge-recycling scheme, a test chip was fabricated using a 0.35 µm CMOS technology. Its power efficiency was measured at 93%.