https://repository.umindanao.edu.ph/handle/123456789/2249 2026-04-27T14:04:25Z 2026-04-27T14:04:25Z Yan, Xiang Qin, Kefan Zheng, Xinyue Hu, Weibo Ma, Wei Cui, Haitao https://repository.umindanao.edu.ph/handle/123456789/2267 2026-04-23T01:50:45Z 2024-11-01T00:00:00Z

A two-channel interleaved ADC with fast-converging foreground time calibration and comparison-based control logic Yan, Xiang; Qin, Kefan; Zheng, Xinyue; Hu, Weibo; Ma, Wei; Cui, Haitao A dual-channel interleaved analog-to-digital converter (ADC) operating at 320 MS/s is prototyped to validate a fast-converging foreground time calibration algorithm that is independent of ADC offset errors. An input polarity switching technique is introduced to eliminate the impact of sub-ADC offset mismatches during foreground time calibration. After foreground calibration, the signal-to-noise and distortion ratio (SNDR) and spurious free dynamic range (SFDR) are improved by 8.6 and 18.4 dB, respectively. In the sub-ADC design, a comparison functionality is enabled in the digital circuits to prevent metastability and expedite data conversion. The single-channel conversion rates reach 160 MS/s. The ADC is implemented via 40-nm digital CMOS technology, achieving a 52.01 dB signal-to-noise plus distortion ratio (SNDR) at near-Nyquist input while sampling at 320 MS/s. The overall power consumption is 3.65 mW, which includes an on-chip reference buffer and a clock circuit. A joint publication of the IEEE circuits and systems society, the IEEE computer society, the IEEE solid-state circuits society.

2024-11-01T00:00:00Z Chen, Yanhang Huang, Siji Huang, Qifeng Fan, Yifei Yuan, Jie https://repository.umindanao.edu.ph/handle/123456789/2266 2026-04-23T00:45:13Z 2024-11-01T00:00:00Z

The error analysis of bit weight self-calibration methods for high-resolution SAR ADCs Chen, Yanhang; Huang, Siji; Huang, Qifeng; Fan, Yifei; Yuan, Jie High-resolution successive approximation register (SAR) analog-to-digital converters (ADCs) commonly need to calibrate their bit weights. Due to the nonidealities of the calibration circuits, the calibrated bit weights carry errors. This error could propagate during the calibration procedure. Due to the high precision requirement of these ADCs, such residue error commonly becomes the signal-to-noise-and-distortion ratio (SNDR) bottleneck of the overall ADC. This article presents an analysis of the residue error from bit weight self-calibration methods of high-resolution SAR ADCs. The major sources contributing to this error and the error reduction methods are quantitively analyzed. A statistical analysis of the noise-induced random error is developed. Our statistical model finds that the noise-induced random error follows the chi-square distribution. In practice, this random error is commonly reduced by repetitively measuring and averaging the calibrated bit weights. Our statistical model quantifies this bit weight error and leads to a clearer understanding of the error mechanism and design trade-offs. Following our chi-square model, the SNDR degradation due to the circuit noise during the calibration can be easily estimated without going through the time-consuming traditional transistor-level design and simulation process. The required repetition time can also be calculated. The bit-weight error models derived in this article are verified with measurement on a 16-bit SAR ADC design in a 180-nm CMOS process. Results from our model match both simulations and measurements well. A joint publication of the IEEE circuits and systems society, the IEEE computer society, the IEEE solid-state circuits society.

2024-11-01T00:00:00Z VanScoy, Amy https://repository.umindanao.edu.ph/handle/123456789/2265 2026-04-22T19:00:30Z 2023-04-01T00:00:00Z

"We bring change to the people" or not: understanding librarians' views on reference and information service as social justice work VanScoy, Amy This qualitative secondary analysis reanalyzes data from a Q methodology study with 66 participants from a variety of library types in Slovenia, South Africa, and the United States. In the original Q methodology study, many participants ranked the statement "librarian as agent if change" as an important conceptualization of reference and information service (RIS). To elucidate and expand this finding, the qualitative data surrounding "librarian as agent of change" were analyzed thematically to understand how participants viewed, or did not view, RIS as making change. Results show that for librarians who perceive themselves as agents of change can be viewed on different level-individual, organizational, and societal. Results show that the pervasiveness of neutrality in RIS prevents some librarians from taking on a role supporting social change and advocacy.

2023-04-01T00:00:00Z Sullivan, Margaret https://repository.umindanao.edu.ph/handle/123456789/2261 2026-04-22T19:00:21Z 2023-04-01T00:00:00Z

Health information as a human right: from justification to practice Sullivan, Margaret The COVID-19 pandemic has illuminated how necessary clear and accurate health information is and yet how vulnerable people are to mis- and disinformation. The object of this article is to put forth a sound argument, based on both policy and philosophical doctrine, on why people-regardless of citizenship-have a right to accurate, current health information. Evidence is provided to show that access to quality health information is a human right asserted by the United Nations, and academic writing from scholars of philosophy is explored to put forth a moral assertion that agrees. Finally. practical measures are offered for librarians and other information professionals to promote these rights in their institutions and communities-for example, by teaching health and information literacy skills while pushing back on disinformation flooding communities in times of crisis.

2023-04-01T00:00:00Z