A radiation-hardened 12-bit non-linear DAC was designed and fabricated on Honeywell’s 0.35 μm MOI5 SOI CMOS process. The non-linear DAC allows a significant reduction in complexity and power dissipation when used within direct digital frequency synthesizers (DDFSs). The non-linear DAC implements a 32-segement piecewise linear approximation to sine function reducing the ROM look-up table size fr...

We present a current output digital-to-analog converter (DAC) targeted for spacecraft applications. The DAC uses a switched current design and thermometer decoding guaranteeing monotonic behavior. Radiation Hard by Design techniques are used to mitigate potential total dose and Single Event Latch-up issues. A prototype DAC has been fabricated on a commercial 0.5μm process through the MOSIS serv...

Improved offline calibration for DAC mismatch in low OSR Sigma Delta ADCs with distributed feedback, " in Proc. Abstract—We present an offline calibration method to correct the non-linearity due to DAC element mismatch in distributed feedback SigmaDelta-modulation A/D-converters. The improvement over previous methods is that not only the first feedback DAC is calibrated, but also the DACs that ...

A new technique is proposed to eliminate the nonlinear error of a multibit digital-to-analog converter (DAC) used in a sigma-delta modulator where the solidity of multibit DAC against the clock jitter is reserved. By using dual quantization, this technique reduces the bit length of DAC to one bit and consequently eliminates its nonlinear error. A lowpass finite impulse response (FIR) filter wit...

Lack of immunogenicity of cancer cells has been considered a major reason for their failure in induction of a tumor specific T cell response. In this paper, we present evidence that decitabine (DAC), a DNA methylation inhibitor that is currently used for the treatment of myelodysplastic syndrome (MDS), acute myeloid leukemia (AML) and other malignant neoplasms, is capable of eliciting an anti-t...

This paper provides a novel assessment of the role of direct air capture of CO2 from ambient air (DAC) on the feasibility of achieving stringent climate stabilization. We use the WITCH energy-economy-climate model to investigate the long term prospects of DAC, implementing a technological specification based on recent estimates by the American Physical Society (APS 2011). Assuming global cooper...

Constructions starting at each of the three in-frame ATG codons of the Acremonium chrysogenum cefG gene (Met1, Met46 and Met60) were expressed in Escherichia coli, obtaining proteins of 49, 44 and 43 kDa, respectively. All three proteins showed deacetylcephalosporin C (DAC) acetyltransferase activity. The native A. chrysogenum DAC acetyltransferase was purified to electrophoretic homogeneity by...

DAC (Digital to Analog Converter) is the enabling inverse technology of ADC that generates analog output proportionate to given digital input. In most of the control and digital processing system requires the DAC for meddlesome with real world. But most of the digital controlling microprocessor and microcontroller don’t have an on chip DAC integrated peripheral architecture. For such implementi...

This paper describes algorithms for generating a low-distortion single-tone signal, for testing ADCs, using an arbitrary waveform generator (AWG). The AWG consists of DSP (or waveform memory) and DAC, and the nonlinearity of the DAC generates distortion components. We propose here to use DSP algorithms to precompensate for the distortion. The DSP part of the AWG can interleave multiple signals ...

We de.ne a new logic-based query language, called DAC, which is an extension of Datalog. A DAC(w(n); h(n))(b(n))-program consists of a family of Datalog programs Pn such that w(n); h(n); b(n) bound the width of rules, the number of rules, and the recursion depth of any Pn, respectively. We exhibit queries which are not Datalog expressible but are DAC expressible. We also prove non-expressivenes...