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A Hybrid Scheme for On-Chip Voltage Regulation in System-On-a-Chip (SOC)

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2 Author(s)
Gjanci, J. ; Dept. of Electr. & Comput. Eng., Univ. of Illinois at Chicago, Chicago, IL, USA ; Chowdhury, M.H.

Conventional off-chip or single-stage on-chip converter will fail to meet the demand for different supply voltage domains for various functional blocks/cores in traditional or future multi-/many-core system-on-a-chips (SOCS). In this paper, a hybrid two-stage voltage regulation scheme is proposed, where the first stage consists of a switching voltage regulator located off-chip, and the second stage consists of a tree structure of linear regulators located on the chip. This approach proves to be efficient, simple and less costly compared to other options that offer total on-chip integration of a switching regulators. The difficulties and limitations of on-chip switching regulator have been analyzed. For the tree structure of on-chip linear regulators two different architectures (cascaded and parallel) have been proposed. It is demonstrated that a cascaded tree of linear regulators is a better solution than a parallel tree structure from performance point of view.

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Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:19 ,  Issue: 11 )