Low Power CNFET SRAM Design

CNFET has emerged as an alternative material to
silicon for high performance, high stability and low power SRAM
design in recent years. SRAM functions as cache memory in
computers and many portable devices. In this paper, a new SRAM
cell design based on CNFET technology is proposed. The proposed
SRAM cell design for CNFET is compared with SRAM cell designs
implemented with the conventional CMOS and FinFET in terms of
speed, power consumption, stability, and leakage current. The
HSPICE simulation and analysis show that the dynamic power
consumption of the proposed 8T CNFET SRAM cell’s is reduced
about 48% and the SNM is widened up to 56% compared to the
conventional CMOS SRAM structure at the expense of 2% leakage
power and 3% write delay increase.





References:
[1] ITRS Process Integration, Devices, and Structures. [Online]. Available:
http://www.itrs.net/Links/2009ITRS/2009Chapters 2009Tables/2009
PIDS.pdf
[2] S. R. Prasad, B. K. Madhavi, and K. L. Kishore, "Design of low-leakage
CNTFET SRAM cell at 32nm technology using forced stack technique,”
International Journal of Engineering Research and Applications, vol. 2,
no. 1, pp. 805-808, Jan.-Feb. 2012.
[3] Ph. Avouris, and J. Chen, "Nanotube electronics and optoelectronics,”
Elsevier Journal Materials Today, vol. 9, no. 10, pp. 46-54, Oct. 2006.
[4] A. Javey and J. Kong, Eds., Carbon Nanotube Electronics, Springer,
New York, 2009.
[5] A. Rahman, J. Guo, S. Datta, and M. S. Lundstrom, "Theory of ballistic
nanotransistors,” IEEE Trans. Electron Devices, vol. 50, no. 9, pp. 1853-
1864, Sept. 2003.
[6] A. Pushkarna, S. Raghavan, and H. Mahmoodi, "Comparison of
performance parameters of SRAM designs in 16nm CMOS and
CNTFET technologies,” in Proc. IEEE International SOC Conference,
Sept. 2010, pp. 27-29.
[7] S. Lin, Y. B. Kim, F. Lombardi, and Y. J. Lee, "A new SRAM cell
design using CNTFETs ,” in Proc. IEEE International SOC Design
Conference, Nov. 2008, pp. 168-171.
[8] S. Lin, Y. B. Kim, and F. Lombardi, "Design of a CNTFET-based
SRAMcell by dual-chirality selection,” IEEE Transactions on
Nanotechnology, vol. 9, no. 1, pp. 30-37, Jan. 2010.
[9] M. S. Dresselhaus, G. Dresselhaus, and Ph. Avouris, Carbon nan-otubes:
synthesis, structure, properties, and applications, Berlin, Ger-many:
Springer-Verlag, 2001.
[10] J. Deng, "Device modeling and circuit performance evaluation for
nanoscale devices: silicon technology beyond 45 nm node and carbon
nanotube field effect transistors,” PhD thesis, Stanford University, Stanford,
USA, Jun. 2007.
[11] Stanford University CNFET Model website. [Online]. Available: http:
//nano.stanford.edu/model stan cnt.htm
[12] N. Patil, A. Lin, J. Zhang, H.S.P. Wong, and S. Mitra, "Digital VLSI
logic technology using carbon nanotube FETs: Frequently Asked Questions,”
in Proc. IEEE Design Automation Conference, Jul. 2009, pp.
304-309
[13] J. Deng, and H.-S. P. Wong ”A Circuit-Compatible SPICE model for
En-hancement Mode Carbon Nanotube Field Effect Transistors,” Proc.
Intl. Conf. Simulation of Semiconductor Processes and Devices, pp. 166
- 169, Sept., 2006.
[14] Tawfik, S.A. Kursun, V. ”Low-Power and Compact Sequential Circuits
With Independent-Gate FinFETs”, Electron Devices, IEEE Transactions
vol. 55, No. 1, pp. 60-70, Jan 2008.
[15] A. Bhavnaganwala, X. Tang, and J. D. Meindl ”The Impact of Intrinsic
Device Fluctuations on CMOS SRAM Cell Stability” IEEE Journal of
Solid-State Circuits, , Vol. 36, No. 4, pp. 658-665. April 2001.