Outline Paper presentation Ultra-Portable Devices Introduction. - PowerPoint PPT Presentation

Outline Paper presentation – Ultra-Portable Devices • Introduction. Paper: Paper: • VT-Sub-CMOS Logic. H Hendrawan S., Kaushik Roy, et al. d S K hik R t l Robust Subthreshold Logic for Ultra-Low Power Operation, • Sub-DTMOS Logic. IEEE Transactions on Very large scale Integration (VLSI) Systems, VOL.9, NO.1, • Results. Date: February, 2001. y, • Summary. Presented by: S. M. Yasser Sherazi Paper Presentation - Ultra Portable Devices 1 Paper Presentation - Ultra Portable Devices 2 2 ” Introduction ” ’’VT-Sub-CMOS Logic’’ • Power vs Frequency for various V dd . Paper Presentation - Ultra Portable Devices 3 Paper Presentation - Ultra Portable Devices 4

”Stabalization Module” ”Leakage Current Monitor” • LCM is the leakge sensor and control to SSB. • SSb applies appropriate bias to the substrate of transistor. Paper Presentation - Ultra Portable Devices 5 Paper Presentation - Ultra Portable Devices 6 ”Self-substrate bias Circuit” ’’V control Vs V bb for various Temps.” Paper Presentation - Ultra Portable Devices 7 Paper Presentation - Ultra Portable Devices 8

”SUB-DTMOS LOGIC” ’’Positive and Negative Pump Circuits’’ Paper Presentation - Ultra Portable Devices 9 Paper Presentation - Ultra Portable Devices 10 ’’Delay verses V dd ’’ ’’Power verses V dd ’’ Paper Presentation - Ultra Portable Devices 11 Paper Presentation - Ultra Portable Devices 12 12

’’VTC of sub-CMOS and sub-DT-CMOS ’’Power-delay Product versus V dd ’’ Logic’’ Logic Paper Presentation - Ultra Portable Devices 13 13 Paper Presentation - Ultra Portable Devices 14 14 ”Sub-DT-Pseudo-NMOS Logic” ”Delay versus number of Fan-outs” Paper Presentation - Ultra Portable Devices 15 15 Paper Presentation - Ultra Portable Devices 16

”Delay versus V dd ” ”Power versus V dd ” Paper Presentation - Ultra Portable Devices 17 Paper Presentation - Ultra Portable Devices 18 ”VTC’s of sub-DT- and sub-Pseudo- ”Power-delay product versus V dd ” NMOS logic” NMOS logic Paper Presentation - Ultra Portable Devices 19 Paper Presentation - Ultra Portable Devices 20

”On-current versus temp” ”Delay versus temp” Paper Presentation - Ultra Portable Devices 21 Paper Presentation - Ultra Portable Devices 22 ”PDP versus temperature” ”Threshold voltage versus V bs ” Paper Presentation - Ultra Portable Devices 23 Paper Presentation - Ultra Portable Devices 24

”Delay versus Threshold Voltage” ”PDP versus Threshold Voltage” Paper Presentation - Ultra Portable Devices 25 Paper Presentation - Ultra Portable Devices 26 ”Effect of ∆ V th ” ” Effect of Temperature” Paper Presentation - Ultra Portable Devices 27 Paper Presentation - Ultra Portable Devices 28

”Conclusion” • Both VT-sub-CMOS and sub-DTMOS logic families show superior robustness and tolerance to temperature and i b t d t l t t t d process variations than that of regularsubthreshold CMOS logic logic. • VT sub CMOS logic can be readily implemented in twin well • VT-sub-CMOS logic can be readily implemented in twin-well process technology, but it requires additional circuitry for stabilization. • In contrast, sub-DTMOS logic does not require any additional co as , sub OS og c does o equ e a y add o a stabilization circuitry but can only be implemented in triple- well process technology. Paper Presentation - Ultra Portable Devices 29