The paper presents a detailed study on the idle leakage reduction techniques on partially depleted silicon-on-insulator (PD-SOI) CMOS SRAM. The most promising leakage reduction techniques that have been proposed are i...
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The paper presents a detailed study on the idle leakage reduction techniques on partially depleted silicon-on-insulator (PD-SOI) CMOS SRAM. The most promising leakage reduction techniques that have been proposed are introduced, analyzed and compared into 65 nm low-power PD-SOI technology, taking into account all the SOI specific effect. Especially, it is shown that the leakage reduction techniques change the strength of individual cell transistor, thus modifying the cell stability during the first read access following a long period of idle mode. The conclusions of the paper show that letting the bit lines float during the idle mode is mandatory to diminish the cell leakage current and help to protect the cell content against the bit-line aggressions.
We present a generic method for analyzing the effect of process variability in nanoscale circuits. The proposed framework uses kernel and a generic tail probability estimator to eliminate the need for a-priori density...
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We present a generic method for analyzing the effect of process variability in nanoscale circuits. The proposed framework uses kernel and a generic tail probability estimator to eliminate the need for a-priori density choice for the nature of circuit variation. This allows capturing the true nature of the circuit variation from a few random samples of its observed responses. The data-driven, non-parametric, and generic nature of the proposed method can greatly facilitate the technology-circuit co-design.
Reliabilities of high-k stacked gate dielectrics are discussed from the viewpoint of the impact of initial traps in high-k layer. TDDB reliability can be explained by the generated subordinate carrier injection (GSCI)...
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Reliabilities of high-k stacked gate dielectrics are discussed from the viewpoint of the impact of initial traps in high-k layer. TDDB reliability can be explained by the generated subordinate carrier injection (GSCI) model. While initial traps increase the leakage current, they do not degrade the TDDB reliability. In contrast, the BTI reliability is strongly degraded by initial traps.
Polarities of plasma charging damage in n- and p-channel MOSFETs with Hf-based high-k gate stack (HfAlOx/SiO 2 ) were studied for two different plasma sources (Ar-and Cl-based gas mixtures), and found to depend on pla...
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Polarities of plasma charging damage in n- and p-channel MOSFETs with Hf-based high-k gate stack (HfAlOx/SiO 2 ) were studied for two different plasma sources (Ar-and Cl-based gas mixtures), and found to depend on plasma conditions, in contrast to those with conventional SiO 2 . For Ar-plasma, which was confirmed to induce a larger charging damage, both n- and p-ch MOSFETs with high-k gate stacks suffer from negative charge trapping, whereas for Cl-plasma confirmed to induce less damage, both n- and p-ch MOSFETs with high-k gate stacks suffer from positive charge trapping, i.e., the direction of threshold voltage (V t ) shift depends on plasma sources and a amount of charging damage. From the results of constant-current stress tests, the present unique V t shifts were attributed to the characteristic hole and electron trapping phenomena, implying the necessity of taking the intrinsic charge trapping process into consideration for accurate evaluations of charging damage on high-k gate dielectrics.
A physical yet analytical phase change memory (PCM) model simultaneously accounting for thermal and electrical conductivities is presented. Due to the physics based nature of the model, the essential temperature from ...
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A physical yet analytical phase change memory (PCM) model simultaneously accounting for thermal and electrical conductivities is presented. Due to the physics based nature of the model, the essential temperature from heating and cooling of PCM during operation is instantaneously updated. More importantly, the model can be applied to non-conventional circuit design technique. We show that for the first time the input current pulsing scheme for PCM programming can be significantly simplified via the unique intrinsic thermal memory effect. The model is implemented in HSPICE using Verilog-A, which is flexible and portable for different circuit simulators. As PCM technology is emerging, the predictive compact model can expedite the novel technology development.
This paper describes a comparative analysis between two topologies of operational amplifiers to design a 40 MS/s 12-bit pipeline analog to digital converter (ADC). The analysis includes AC and transient simulation to ...
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This paper describes a comparative analysis between two topologies of operational amplifiers to design a 40 MS/s 12-bit pipeline analog to digital converter (ADC). The analysis includes AC and transient simulation to select the proper topology. This ADC is implemented in a 0.35 mum AMS CMOS technology with 3.3 V single power supply. The capacitors and selected operational amplifiers were scaled for low power dissipation. All analog components of this pipeline ADC are fully differential, as there are dynamic comparators, analog multiplexers and operational amplifiers with gain boosting.
The dramatic increase in leakage current, coupled with the swell in process variability in nano-scaled CMOS technologies, has become a major issue for future IC design. Moreover, due to the spread of leakage power val...
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The dramatic increase in leakage current, coupled with the swell in process variability in nano-scaled CMOS technologies, has become a major issue for future IC design. Moreover, due to the spread of leakage power values, leakage variability cannot be neglected anymore. In this work an accurate analytic estimation and modeling methodology has been developed for logic gates leakage under statistical process variations. The developed methodology is completely based on BSIM4 equations, implemented in Verilog-A, and applicable to any different CMOS technologies (90 nm, 65 nm, etc), electrical simulators and models. For the first time subthreshold, gate, BTBT, and GIDL leakage variations are considered. Comparisons to Monte-Carlo simulation on 90 and 65 nm STMicroelectronics CMOS technologies fully validate the accuracy of the proposed method and demonstrate the efficiency of the proposed analysis method.
The following topics are dealt: advanced transistor structure, architecture and process; RF & AMS; low power electronics; reliability; system level technology assessment; DFM/DFT/DFY/DFR; advanced memory devices; ...
The following topics are dealt: advanced transistor structure, architecture and process; RF & AMS; low power electronics; reliability; system level technology assessment; DFM/DFT/DFY/DFR; advanced memory devices; advanced materials; soft error rate; SoC/MPSoC/SIP, IC & platform design & process; and CAD.
Ultra Thin Body Si-On-ONO (UTB SOONO) transistors with ultra thin spacer are successfully demonstrated and evaluated. They have shown increased driving current more than 30% compared with conventional UTB SOONO transi...
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Ultra Thin Body Si-On-ONO (UTB SOONO) transistors with ultra thin spacer are successfully demonstrated and evaluated. They have shown increased driving current more than 30% compared with conventional UTB SOONO transistors with thick spacer due to reduced source/drain resistance without short channel effect degradation by using thin spacer. In this paper, it is shown that thin spacer technology is very attractive to UTB SOI device in terms of device performance and process simplicity.
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