Spelling suggestions: "subject:"analógicodigital"" "subject:"analogdigital""
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CMOS differential analog optical receivers with hybrid integrated I-MSM detectorChang, Jae Joon 08 1900 (has links)
No description available.
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Analysis, design, and testing of semiconductor intersubband devicesImam, Neena 12 1900 (has links)
No description available.
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Energy Harvesting for Self-Powered Wireless SensorsWardlaw, Jason 2011 December 1900 (has links)
A wireless sensor system is proposed for a targeted deployment in civil infrastructures (namely bridges) to help mitigate the growing problem of deterioration of civil infrastructures. The sensor motes are self-powered via a novel magnetic shape memory alloy (MSMA) energy harvesting material and a low-frequency, low-power rectifier multiplier (RM). Experimental characterizations of the MSMA device and the RM are presented. A study on practical implementation of a strain gauge sensor and its application in the proposed sensor system are undertaken and a low-power successive approximation register analog-to-digital converter (SAR ADC) is presented. The SAR ADC was fabricated and laboratory characterizations show the proposed low-voltage topology is a viable candidate for deployment in the proposed sensor system. Additionally, a wireless transmitter is proposed to transmit the SAR ADC output using on-off keying (OOK) modulation with an impulse radio ultra-wideband (IR-UWB) transmitter (TX). The RM and SAR ADC were fabricated in ON 0.5 micrometer CMOS process.
An alternative transmitter architecture is also presented for use in the 3-10GHz UWB band. Unlike the IR-UWB TX described for the proposed wireless sensor system, the presented transmitter is designed to transfer large amounts of information with little concern for power consumption. This second method of data transmission divides the 3-10GHz spectrum into 528MHz sub-bands and "hops" between these sub-bands during data transmission. The data is sent over these multiple channels for short distances (?3-10m) at data rates over a few hundred million bits per second (Mbps). An UWB TX is presented for implementation in mode-I (3.1-4.6GHz) UWB which utilizes multi-band orthogonal frequency division multiplexing (MB-OFDM) to encode the information. The TX was designed and fabricated using UMC 0.13 micrometer CMOS technology. Measurement results and theoretical system level budgeting are presented for the proposed UWB TX.
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A Low Jitter Analog Circuit for Precisely Correcting Timing Skews in Time Interleaved Analog-to-Digital ConvertersBray, Adam 22 November 2013 (has links)
Time-interleaved analog-to-digital converters are an attractive architecture for achieving a high speed, high resolution ADC in a power efficient manner. However, due to process and manufacturing variations, timing skews occur between the sampling clocks of the sub ADCs within the TI-ADC. These timing skews compromise the spurious free dynamic range of the converter. In addition, jitter on the sampling clocks, degrades the signal-to-noise ratio of the TI-ADC. Therefore, in order to maintain an acceptable spurious free dynamic range and signal to noise ratio, it is necessary to correct the timing skews while adding minimal jitter.
Two analog-based architectures for correcting timing skews were investigated, with one being selected for implementation. The selected architecture and additional test circuitry were designed and fabricated in a 0.18??m CMOS process and tested using a 125 MSPS 16 bit ADC. The circuit achieves a correction precision on the order of 10???s of femtoseconds for timing skews as large as approximately 180 picoseconds, while adding less than 200 femtoseconds of rms jitter.
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A prototype investigation of a multi-GHz multi-channel analog transient recorder /Kohnen, William. January 1986 (has links)
No description available.
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Two problems in signal quantization and A/D conversionJimenez, David 09 June 2008 (has links)
We consider two different problems in quantization theory. During the first part we discuss the so called Bennett's White Noise Hypothesis, introduced to study quantization errors of different schemes. Under this hypothesis, one assumes that the reconstruction errors of different channels can be considered as uniform, independent and identically distributed random variables.
We prove that in the case of uniform quantization errors for frame expansions, this hypothesis is in fact false. Nevertheless, we also prove that in the case of fine quantization, the errors of different channels are asymptotically uncorrelated, validating, at least partially, results on the computation of the mean square error of reconstructions that were obtained through the assumption of Bennett's hypothesis.
On the second part, we will introduced a new scalar quantization scheme, called a Beta Alpha Encoder. We analyze its robustness with respect to the quantizer imperfections. This scheme also induces a challenging dynamical system. We give partial results dealing with the ergodicity of this system.
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Effects of fixed-point DSP processing on DMT based xDSL applications /Deng, Feng, January 1900 (has links)
Thesis (M. Eng.)--Carleton University, 2001. / Includes bibliographical references (p. 129-132). Also available in electronic format on the Internet.
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A low-voltage CMOS imager with wide dynamic range /Fortier, Justin January 1900 (has links)
Thesis (M.Eng.) - Carleton University, 2002. / Includes bibliographical references (p. 83-86). Also available in electronic format on the Internet.
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A multi-functional digital receiver with adaptive filtering and bit synchronization /Powell, Stephen, January 1900 (has links)
Thesis (M. App. Sc.)--Carleton University, 2003. / Includes bibliographical references (p. 94-96). Also available in electronic format on the Internet.
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The impact of non-ideal analog factors on OFDM signaling /Lee, Chiko, January 1900 (has links)
Thesis (M. App. Sc.)--Carleton University, 2005. / Includes bibliographical references (p. 179-183). Also available in electronic format on the Internet.
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