Adaptive Supply Voltage for Low-Power Ripple-Carry and Carry-Select Adders

Hiroaki SUZUKI; Woopyo JEONG; Kaushik ROY

doi:10.1093/ietele/e90-c.4.865

Adaptive Supply Voltage for Low-Power Ripple-Carry and Carry-Select Adders

Hiroaki SUZUKI, Woopyo JEONG, Kaushik ROY

Full Text Views

0

Share
Cite this

Summary :

Demands for the low power VLSI have been pushing the development of aggressive design methodologies to reduce the power consumption drastically. To meet the growing demand, we propose low power adders that adaptively select supply voltages based on the input vector patterns. First, we apply the proposed scheme to the Ripple Carry Adder (RCA). A prototype design by a 0.18 µm CMOS technology shows that the Adaptive VDD 32-bit RCA achieves 25% power improvement over the conventional RCA with similar speed. The proposed adder cancels out the delay penalty, utilizing two innovative techniques: carry-skip techniques on the checking operands, and the use of Complementary Pass Transistor Logic (CPL) with dual supply voltage for level conversion. As an expansion to faster adder architectures, we extend the proposal to the Carry-Select Adders (CSA) composed of the RCA sub-blocks. We achieved 24% power improvement on the 128-bit CSA prototype over a conventional design. The proposed scheme also achieves stand-by leakage power reduction--for 32-bit and 128-bit Adaptive RCA and CSA, respectively, 62% and 54% leakage reduction was possible.

Publication: IEICE TRANSACTIONS on Electronics Vol.E90-C No.4 pp.865-876

Publication Date: 2007/04/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1093/ietele/e90-c.4.865

Type of Manuscript: PAPER

Category: Electronic Circuits

Cite this

Copy

Hiroaki SUZUKI, Woopyo JEONG, Kaushik ROY, "Adaptive Supply Voltage for Low-Power Ripple-Carry and Carry-Select Adders" in IEICE TRANSACTIONS on Electronics, vol. E90-C, no. 4, pp. 865-876, April 2007, doi: 10.1093/ietele/e90-c.4.865.
Abstract: Demands for the low power VLSI have been pushing the development of aggressive design methodologies to reduce the power consumption drastically. To meet the growing demand, we propose low power adders that adaptively select supply voltages based on the input vector patterns. First, we apply the proposed scheme to the Ripple Carry Adder (RCA). A prototype design by a 0.18 µm CMOS technology shows that the Adaptive VDD 32-bit RCA achieves 25% power improvement over the conventional RCA with similar speed. The proposed adder cancels out the delay penalty, utilizing two innovative techniques: carry-skip techniques on the checking operands, and the use of Complementary Pass Transistor Logic (CPL) with dual supply voltage for level conversion. As an expansion to faster adder architectures, we extend the proposal to the Carry-Select Adders (CSA) composed of the RCA sub-blocks. We achieved 24% power improvement on the 128-bit CSA prototype over a conventional design. The proposed scheme also achieves stand-by leakage power reduction--for 32-bit and 128-bit Adaptive RCA and CSA, respectively, 62% and 54% leakage reduction was possible.
URL: https://globals.ieice.org/en_transactions/electronics/10.1093/ietele/e90-c.4.865/_p

Copy

@ARTICLE{e90-c_4_865,
author={Hiroaki SUZUKI, Woopyo JEONG, Kaushik ROY, },
journal={IEICE TRANSACTIONS on Electronics},
title={Adaptive Supply Voltage for Low-Power Ripple-Carry and Carry-Select Adders},
year={2007},
volume={E90-C},
number={4},
pages={865-876},
abstract={Demands for the low power VLSI have been pushing the development of aggressive design methodologies to reduce the power consumption drastically. To meet the growing demand, we propose low power adders that adaptively select supply voltages based on the input vector patterns. First, we apply the proposed scheme to the Ripple Carry Adder (RCA). A prototype design by a 0.18 µm CMOS technology shows that the Adaptive VDD 32-bit RCA achieves 25% power improvement over the conventional RCA with similar speed. The proposed adder cancels out the delay penalty, utilizing two innovative techniques: carry-skip techniques on the checking operands, and the use of Complementary Pass Transistor Logic (CPL) with dual supply voltage for level conversion. As an expansion to faster adder architectures, we extend the proposal to the Carry-Select Adders (CSA) composed of the RCA sub-blocks. We achieved 24% power improvement on the 128-bit CSA prototype over a conventional design. The proposed scheme also achieves stand-by leakage power reduction--for 32-bit and 128-bit Adaptive RCA and CSA, respectively, 62% and 54% leakage reduction was possible.},
keywords={},
doi={10.1093/ietele/e90-c.4.865},
ISSN={1745-1353},
month={April},}

Copy

TY - JOUR
TI - Adaptive Supply Voltage for Low-Power Ripple-Carry and Carry-Select Adders
T2 - IEICE TRANSACTIONS on Electronics
SP - 865
EP - 876
AU - Hiroaki SUZUKI
AU - Woopyo JEONG
AU - Kaushik ROY
PY - 2007
DO - 10.1093/ietele/e90-c.4.865
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E90-C
IS - 4
JA - IEICE TRANSACTIONS on Electronics
Y1 - April 2007
AB - Demands for the low power VLSI have been pushing the development of aggressive design methodologies to reduce the power consumption drastically. To meet the growing demand, we propose low power adders that adaptively select supply voltages based on the input vector patterns. First, we apply the proposed scheme to the Ripple Carry Adder (RCA). A prototype design by a 0.18 µm CMOS technology shows that the Adaptive VDD 32-bit RCA achieves 25% power improvement over the conventional RCA with similar speed. The proposed adder cancels out the delay penalty, utilizing two innovative techniques: carry-skip techniques on the checking operands, and the use of Complementary Pass Transistor Logic (CPL) with dual supply voltage for level conversion. As an expansion to faster adder architectures, we extend the proposal to the Carry-Select Adders (CSA) composed of the RCA sub-blocks. We achieved 24% power improvement on the 128-bit CSA prototype over a conventional design. The proposed scheme also achieves stand-by leakage power reduction--for 32-bit and 128-bit Adaptive RCA and CSA, respectively, 62% and 54% leakage reduction was possible.
ER -