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Browsing MIT Open Access Articles by Title
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(The International Society for Optical Engineering, 2009-09)We report on recent progress in developing diffraction gratings which can potentially provide extremely high spectral resolution of 10[superscript 5]-10[superscript 6] in the EUV and soft x-ray photon energy ranges. Such ...
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(Institute of Electrical and Electronics Engineers (IEEE), 2010-12)We have demonstrated 50-nm enhancement-mode (E-mode) In[subscript 0.7]Ga[subscript 0.3]As PHEMTs with f[subscript max] in excess of 1 THz. The devices feature a Pt gate sinking process to effectively thin down the In[subscript ...
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(Institute of Electrical and Electronics Engineers, 2010-02)An 8T SRAM fabricated in 45 nm SOI CMOS exhibits voltage scalable operation from 1.2 V down to 0.57 V with access times from 400 ps to 3.4 ns. Timing variation and the challenge of low-voltage operation are addressed with ...
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(Institute of Electrical and Electronics Engineers (IEEE), 2010-12)We have developed a new self-aligned gate technology for InGaAs High Electron Mobility Transistors with non-alloyed Mo-based ohmic contacts and a very low parasitic capacitance gate design. The new process delivers a contact ...
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(Institute of Electrical and Electronics Engineers, 2008-12)Aggressive supply voltage scaling to below the device threshold voltage provides significant energy and leakage power reduction in logic and SRAM circuits. Consequently, it is a compelling strategy for energy-constrained ...
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(Institute of Electrical and Electronics Engineers, 2009-08)A 6-bit highly digital flash ADC is implemented in a 0.18 mum CMOS process. The ADC operates in the subthreshold regime down to 200 mV and employs comparator redundancy and reconfigurability to improve linearity. The ...
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(VLSI-TSA, 2009-04)We present a digitally assisted subsampler, designed to serve as the downconversion path in adaptive predistorters for 800MHz–5.8GHz RF power amplifiers. We use digital averaging to overcome the noise folding problems ...
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(Institute of Electrical and Electronics Engineers (IEEE), 2010-01)A 76 GHz phase-locked loop (PLL) was designed in 0.13 μm IBM BiCMOS8HP technology with the intended application of millimeter-wave imaging. The PLL has a type II second order loop filter. The voltage-controlled oscillator ...
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(Institute of Electrical and Electronics Engineers, 2009-12)The use of a VCO-based integrator and quantizer within a continuous-time (CT) \Delta \Sigma analog-to-digital converter (ADC) structure is explored, and a custom prototype in a 0.13 \mum CMOS with a measured performance ...
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(National Academy of Sciences (U.S.), 2009-09)A hyperstable complex of the tetrameric MuA transposase with recombined DNA must be remodeled to allow subsequent DNA replication. ClpX, a AAA+ enzyme, fulfills this function by unfolding one transpososome subunit. Which ...
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(Proceedings of the National Academy of Sciences (PNAS), 2011-09)Well-differentiated liposarcoma (WDLPS), one of the most common human sarcomas, is poorly responsive to radiation and chemotherapy, and the lack of animal models suitable for experimental analysis has seriously impeded ...
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Aberrant substrate engagement of the ER translocon triggers degradation by the Hrd1 ubiquitin ligase (Rockefeller University Press, The, 2012-06)Little is known about quality control of proteins that aberrantly or persistently engage the endoplasmic reticulum (ER)-localized translocon en route to membrane localization or the secretory pathway. Hrd1 and Doa10, the ...
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(American Physical Society, 2010-05)We extend the recently developed converse NMR approach [Thonhauser et al., J. Chem. Phys. 131, 101101 (2009)] such that it can be used in conjunction with norm-conserving, nonlocal pseudopotentials. This extension permits ...
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(Elsevier ScienceDirect, 2009-08)Based on high-level ab initio calculations, we predict the existence of a strong 4Σ+–4Σ+ [superscript 4 sigma superscript + - superscript 4 sigma superscript +] optical transition (dav=1.6 D) [(d subscript av = 1.6 D)] ...
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(Nature Publishing Group, 2010-07)RNA-Seq provides an unbiased way to study a transcriptome, including both coding and noncoding genes. To date, most RNA-Seq studies have critically depended on existing annotations, and thus focused on expression levels ...
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(American Physical Society, 2011-07)Using first-principles density-functional-theory–based calculations, we analyze the structural stability of small clusters of 3d late transition metals. We consider the relative stability of the two structures: layer-like ...
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(American Physical Society, 2010-11)We present a low-temperature structural model for lithium imide (Li[subscript 2]NH) that is consistent with experimental studies. Using the cluster expansion formalism and density-functional theory, we have identified a ...
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(Public Library of Science, 2009-04)The engulfment of apoptotic cells is required for normal metazoan development and tissue remodeling. In Caenorhabditis elegans, two parallel and partially redundant conserved pathways act in cell-corpse engulfment. One ...
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(MIT Press, 2009-01)Abortion legalization in the early 1970s led to dramatic changes in fertility. Some research has suggested that it altered cohort outcomes, but this literature has been limited and controversial. In this paper, we provide ...
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(Optical Society of America, 2011-06)We present numerical experiments showing how coupled-mode theory can be systematically applied to join very dissimilar photonic crystal waveguides with 100% transmission. Our approach relies on appropriately tuning the ...
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