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INDEPENDENT GATE FINFET SRAM CELL USING LEAKAGE REDUCTION TECHNIQUES
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International Association of
Scientific Innovation and Research (IASIR) (An Association Unifying the Sciences, Engineering, and Applied Research) (An Association Unifying the Sciences, Engineering, and Applied Research) International Journal of Em erging Technologies in Computational and Applied Sciences (IJETCAS) www.iasir.net IJETCAS 14- 632; © 2014, IJETCAS All Rights Reserved Page 289 ISSN (Print): 2279-0047 ISSN (Online): 2279-0055 INDEPENDENT GATE FINFET SRAM CELL USING LEAKAGE REDUCTION TECHNIQUES Anshul Jain1, Dr. Minal Saxena2 and Virendra Singh2 1Research Scholar of Sagar Institute of Research & Technology, Bhopal, Madhya Pradesh, India 2 Professor, Dept. of Electronics and Communication, Sagar Institute of Research & Technology, Bhopal, Madhya Pradesh, India. __________________________________________________________________________________________ Abstract: Scaling of devices in bulk CMOS technology contributes to short channel effects and increase in leakage. Static random access memory (SRAM) is needed to occupy 90% of the area of SoC. Since leakage becomes the important factor in SRAM cell, it is implemented using FinFET. FinFET devices became better alternative for deep submicron technologies. In this paper, 6T SRAM cell is implemented using independent gate FinFET in which both the opposite side of gates are operated independently which provides better scalability to the SRAM cell. The device is implemented using different leakage reduction techniques such as Multi threshold voltage, and Gated-VDD technique to reduce leakage current, power consumption in the SRAM cell and provides better performance. The Proposed FinFET based 6T SRAM cell has been designed using Cadence Virtuoso Tool, all the simulation results has been generated by Cadence SPECTRE simulator at 45nm Technology. Keywords: SRAM, FinFET, Leakage Current, Leakage Power, Independent Gate ______________________________________________________________________________________ I. INTRODUCTION CMOS scaling has lead to advance in performance of digital circuits however faces important challenges due to process technology limits. Sub-threshold leakage, short channel effects, gate dielectric leakage and device-to- device changes are the challenges lead in additional leakage current [1]. Scaling to nanometer regime develops a major short channel effect which develops from several geometrical effects in which the channel length becomes equal to the depletion layer [2]. Drain Induced Barrier Lowering (DIBL) is the major effect produced by SCE, in which high electric fields from the drain can lower that barrier that is supposedly only controlled by the gate. As technology scales down, while dealing with short-channels (SCEs), not only very ultra-thin to keep the current drive is required but also very low VTH is required to maintain the device speed and VTH variations under control [3] as this effect can degrade the devices sub-threshold slope and cause changes in the threshold Voltage (VTH). Therefore, multi-gate FETs such as planar double gate FETs and FinFETs have been proposed for low power digital CMOS technologies to reduce SCE. FinFET is a double gate device in which second gate is aligned vertically opposite to the first gate [4]. FinFET can be designed as tied gate and independent gate FinFET. In the tied gate type, both the opposite gates are tied together giving short channel effect immunity and in the independent gate, one gate is used to switch ON/OFF and threshold voltage of the FinFET is adjusted by the other gate gives better VTH control [5]. Use of independent gate FinFET reduces leakage and hence reduces power consumption to improve performance. Many circuit and architectural level techniques have been introduced to reduce leakage. In this paper, some circuit level techniques are introduced instead of architectural level techniques, because architectural level techniques degrade the performance with the reduction of power. There are different types of leakage reduction techniques. One is multi threshold leakage reduction technique [6] which uses high threshold PMOS and NMOS acting as a switch to disconnect power supply during standby mode thereby reducing leakage. This technique provides increased operating speed by low threshold MOSFET and reduced leakage by high threshold voltage. This technique has the disadvantage of increased overall circuit area and introduces extra parasitic capacitance and delay during MOSFET fabrication. Other technique is gated VDD [7] in which a NMOS transistor with gated voltage supply is connected to the SRAM cell. This technique maintains the lower supply and threshold voltages although reducing leakage and leakage power dissipation. Stacking effect is produced by additional transistor in combination with the SRAM cell transistors when the gated-VDD transistor is turned OFF [8]. These techniques have also been used to reduce leakage in independent gate mode of FinFET based 6T SRAM cell. II. FINFET BASED SRAM CELL The FinFET SRAM cell structure is better choice due to the self-alignment of opposite side of gates and the fabrication compatibility with the existing standard CMOS fabrication technology. The supply voltage (VDD), threshold voltage (VTH) and Fin height can be used for reducing leakage in SRAM cell by increasing Fin-height which allows reduction in VDD but reduction in VDD leaves strong impact on the stability of the SRAM cell under the parametric variations [9]. FinFET provides effective control of the short-channel effects without
2.
Anshul Jain et
al., International Journal of Emerging Technologies in Computational and Applied Sciences, 9(3), June-August, 2014, pp. 289-294 IJETCAS 14- 632; © 2014, IJETCAS All Rights Reserved Page 290 vigorously scaling down the gate-oxide thickness and increasing the channel doping density [10-11]. The FinFET SRAM cell works in different four modes: shorted or tied gate (SG) mode, independent gate (IG) mode, low power (LP) mode and IG/LP mode. In the independent gate mode, both the gates are controlled independently for low power consumption. Independent Gate FinFET SRAM Cell Opposite side of gates are restrained independent to each other in the independent gate FinFET. In this device, multi-threshold voltages are provided by independent gate biasing which can be exploited to reduce number of transistors. Independent gate SRAM cell is designed which reduces leakage current and increase data stability hence performance of the cell. Fins have been provided with minimum width. In cross coupled inverters, both the opposite side gates in pull up transistors are controlled independently to provide multi-threshold voltages and opposite gates in pull down transistors are tied to each other. Direct-data-access mechanism causes interference in read cycle [12] which can be minimized within the latch without increasing the transistor size. Therefore independent gate FinFET gives better stability in SRAM cell. Figure 1: Schematic design of SRAM cell using independent gate FinFET During the word line (WL) is kept at low, the access transistors cut off to make the SRAM in standby mode. The stored bit is sustained by the latch of the SRAM cell. For a read operation, WL becomes high after the bit lines (BL and BLB) are pre-charged to VDD and VSS. Node Q stores “0”, BL is discharged through NM3 and NM1. Alternatively, when node QB stores “0”, BLB is discharged through NM4 and NM2. The access transistors NM3 and NM4 act as high-VTH devices with weaker current conducting capability as compared to tied-gate FinFET SRAM so that the current produced by access transistors is reduced. During a write operation, the WL is high. The access transistors NM3 and NM4 act as weak high-threshold-voltage devices. To write “0” at node Q, BL is discharged and BLB is charged so that transistor NM3 conducts and “0” is passed to IG-FinFET SRAM cell through NM3. Alternatively, to write “0” at node QB, BL is charged and BLB is discharged so that transistor NM4 conducts and “0” is passed to IG FinFET SRAM cell through NM4 as shown in Figure 1. III. LEAKAGE REDUCTION TECHNIQUES (A) Multi Threshold Voltage Leakage Reduction Technique In multi threshold voltage (MVT) technique [13], a high threshold sleep control is connected in series with low VTH circuit. In active mode, sleep transistor must be ON to provide the standard circuit functionality of SRAM cell. In standby mode, sleep transistor must be OFF to provide the improved leakage control. Sleep transistor of high threshold must be used otherwise leakage current will increase making this technique less effective so that low threshold FinFET transistors are used in the SRAM cell logic and high threshold transistor as sleepy transistor. High VTH transistors are used for low sub-threshold current and low VTH transistors are used to improve the performance of the cell. These two different types of threshold can be developed by changing the channel length. Figure 2 and 3 shows the MVT technique using PMOS and NMOS respectively. Low VTH Logic Sleep VDD Virtual VDD High VTH WL BL GND BLB PM1 NM1 PM2 NM2 NM3 NM4 Q QB VDD VDD Figure 2: PMOS HVT
3.
Anshul Jain et
al., International Journal of Emerging Technologies in Computational and Applied Sciences, 9(3), June-August, 2014, pp. 289-294 IJETCAS 14- 632; © 2014, IJETCAS All Rights Reserved Page 291 In Figure 2, PMOS high threshold voltage transistor is connected above the low threshold voltage device providing the virtual VDD, whereas in Figure 3, NMOS high threshold voltage transistor is connected below the low threshold voltage device to provide virtual ground. (B) Gated VDD Technique Leakage associated with SRAM cell creates major problem in chip designing because of large area. The leakage in cell can be reduced using gated VDD technique by contributing an extra transistor producing stacking effect. This extra NMOS transistor produces greater impact on leakage current in conjunction with SRAM cell transistors. Figure 4: Conventional 6T SRAM cell using gated VDD technique It happens because gated transistor becomes ON in used portions and becomes OFF during unused portions in SRAM cell. Here NMOS transistor is connected between ground and source region of NMOS transistors of the cell. Similarly, PMOS transistor can also be connected between the VDD and source region of PMOS transistors in SRAM cell. Gated VDD transistor becomes ON during active mode and switches to OFF state during standby mode. Leakage current due to this technique can be reduced by stacking effect produced which arises because of the three transistors present between the ground terminal and the bit lines (BL and BLB). Transistor of adequate width must be used to provide isolation from leakage current during read cycle. During PMOS gated VDD, insignificant area overhead and transistor width reduces because of no concern during read operation. So that NMOS gated VDD provide better control over the leakage than PMOS gated VDD. The gated VDD technique is shown in Figure 4. IV. PERFORMANCE ANALYSIS OF DOUBLE GATE FINFET SRAM CELL USING MVT AND GATED VDD TECHNIQUES The 6T FinFET SRAM cell using independent gate mode is simulated using Cadence virtuoso tool at 27o C in 45 nm technology. In the SRAM cell, the output Q depends on bit line (BL) and QB depends on bit line bar (BLB) when write line (WL) is kept high. Leakage current and leakage power in independent gate FinFET SRAM cell are shown in Figure 5 and 6 respectively in which transient analysis between 0 ns and 100 ns has been done and leakage current is calculated approximately equal to 120.3 pA and leakage power becomes 21.46 nW. The leakage current and leakage power in Independent gate FinFET is reduced using multi threshold voltages. Figure 7 and 8 shows leakage current and leakage power during standby mode in IG FinFET SRAM cell using PMOS HVT technique. According to this waveform, when elevated threshold PMOS transistor is connected serially between VDD and low threshold SRAM cell logic circuit, sub-threshold leakage and leakage power reduces allowing the low threshold circuit to amplify the performance of the device. BL BLB VDD GND PM1 NM1 PM2 NM2 NM3 NM4 Q QB Gated VDD control Sleep High VTH VDD Virtual ground Low VTH Logic Figure 3: NMOS HVT WL
4.
Anshul Jain et
al., International Journal of Emerging Technologies in Computational and Applied Sciences, 9(3), June-August, 2014, pp. 289-294 IJETCAS 14- 632; © 2014, IJETCAS All Rights Reserved Page 292 Figure 5: Leakage current in independent gate FinFFET Figure 6 Leakage current in independent gate FinFET Transient response of IG FinFET SRAM cell is observed using MVT technique and leakage current and power have been obtained which are predicted equal to 51.48 pA and 8.103 nW respectively. Figure 7: Leakage current in IG FinFET SRAM using PMOS HVT Figure 9 and 10 shows leakage current and leakage power waveform of independent gate FinFET SRAM cell when sleep transistor is kept OFF throughout hold state using NMOS HVT transistor. When high threshold NMOS transistor is connected between ground and low threshold SRAM cell logic leakage current and leakage power reduces and thereby reducing power consumption and increased performance. Leakage current and leakage power have been observed approximately equal to 51.92 pA and 20.59 nW respectively. Simulated independent gate FinFET SRAM cell is connected with gated VDD transistor generating stacking effect. NMOS gated VDD transistor is used because it provides better insulation from leakage current and leakage power than PMOS gated VDD transistor. The extra gated VDD transistor becomes OFF during unused portions of the SRAM cell by providing virtual ground. The leakage current in gated VDD circuit is 58.09 pA moreover leakage power becomes 20.65 nW reducing the total power consumption as shown in Figure 11 and 12.
5.
Anshul Jain et
al., International Journal of Emerging Technologies in Computational and Applied Sciences, 9(3), June-August, 2014, pp. 289-294 IJETCAS 14- 632; © 2014, IJETCAS All Rights Reserved Page 293 Figure 8: Leakage power in IG FinFET SRAM cell using PMOS HVT Figure 9: Leakage current in IG FinFET SRAM cell using NMOS HVT Figure 10: Leakage power in IG FinFET SRAM cell using NMOS HVT Figure 11: Leakage current in IG FinFET using gated VDD
6.
Anshul Jain et
al., International Journal of Emerging Technologies in Computational and Applied Sciences, 9(3), June-August, 2014, pp. 289-294 IJETCAS 14- 632; © 2014, IJETCAS All Rights Reserved Page 294 Figure 12: Leakage power in IG FinFET using gated VDD SRAM Cells Leakage Current (pA) Leakage Power (nW) Independent Gate 120.3 21.46 IG with HVT PMOS HVT 51.48 8.103 NMOS HVT 51.92 20.59 IG with Gated VDD 58.09 20.65 Table 1: Leakage Current and leakage power in Independent gate FinFET SRAM Cell using MVT and Gated VDD V. CONCLUSION Since SRAM cell consumes larger cell area in embedded system designs it should have less leakage current and consume less power to offer better performance. Acording to the simulated results it is concluded that leakage current and leakage power have reduced to about 94 % using independent gate FinFET in comparison with conventional MOSFET. Leakage current in IG FinFET SRAM cell using NMOS HVT is reduced by approximately 95 %.Leakage current using PMOS HVT is reduced by 94 % and using gated VDD technique, it is reduced by 93 % Similarly leakage power is reduced by approximately 30 % using NMOS HVT and leakage power is reduced by 76 % using PMOS HVT in IG FinFET SRAM cell.Whereas leakage power is reduced by ~20 % - 25% using gated VDD technique in IG FinFET SRAM cell.Therefore it can be said that among these leakage reduction techniques, Multi threshold voltage technique offers better leakage control over the gated VDD technique by providing virtual ground and virtual VDD instead of direct supply voltage. MVT technique provide less power consumption and better performance making it suitable for IC design. REFERENCES [1] “Process Integration, Devices, and Structures,” International Technology Roadmap for Semiconductors, 2011 Edition. [2] Marc Van Rossum, “MOS Device and Interconnects Scaling Physics,” Springer, 2009. [3] David Michael Fried, “The Design, Fabrication and Characterization of Independent-Gate FinFETs,” Cornell University, pp 1- 184, 2004. [4] Kazuhiro Nakajima, “Interface-State Density of Three Dimensional Silicon Channels Measured by Charge Pumping Method,” Department of Electronics and Applied Physics, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 2012. [5] Paolo Magnone, Felice Crupi, Abdelkarim Mercha, Pietro Andricciola, Hans Tuinhout, and Robert J. P. Lander, “FinFET Mismatch in Sub-threshold Region: Theory and Experiments,” IEEE Transactions On Electron Devices, vol. 57, no. 11, pp. 2848-2856, November 2010. [6] Masoud Rostami and Kartik Mohanram, “Novel Dual-VTH Independent-Gate FinFET Circuits,” IEEE Conference on Design Automation (ASP-DAC), pp. 867-872, 2010. [7] Zhiyu Liu, V. kursun, “High Read Stability and Low Leakage SRAM Cell Based on Data/Bit line Decoupling,” IEEE Proceedings of SOC Conference, pp. 115 – 116, 2006. [8] Rajlaxmi Belavadi, Pramod Kumar. T, Obaleppa. R. Dasar, Narmada. S, Rajani. H. P, “Design and Implementation of Low Leakage Power SRAM System Using Full Stack Asymmetric SRAM,” International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering, vol. 2, issue 7, pp. 3083-3091, July 2013. [9] Changhwan Shin, “Advanced MOSFET Designs and Implications for SRAM Scaling,” University of California, Berkeley, 2011. [10] Zhiyu Liu, S. A. Tawfik, V. kursun, “Statistical Data Stability and Leakage Evaluation of FinFET SRAM Cells with Dynamic Threshold Voltage Tuning under Process Parameter Fluctuations,” IEEE Symposium on Quality electronic design, pp- 305 – 310, 2008. [11] Garima Mittal and Nidhi Bajpayee, “Comparative Analysis of Leakage current and Ground Bounce Noise using MTCMOS combinational circuit,” Journal of Environmental Science, Computer Science and Engineering & Technology, vol.2, no.2, pp. 467-476, 2013. [12] Bipin Gupta, Sangeeta Nakhate, “TRANSISTOR GATING: A Technique for Leakage Power Reduction in CMOS Circuits,” International Journal of Emerging Technology and Advanced Engineering, volume 2, issue 4, pp. 321-326, April 2012. [13] Ehsan Pakbaznia, Massoud Pedram, “Coarse-Grain MTCMOS Sleep Transistor Sizing Using Delay Budgeting,” Proceedings of the conference on Design, automation and test in Europe, pp. 385-390, 2008.
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