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Yang, Qing

Qing Yang

M. Sc.

Gastwissenschaftler
Institut für Intelligente Sensorik und Theoretische Elektrotechnik

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+49 711 685 60841
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Pfaffenwaldring 47
70569 Stuttgart
Deutschland
Raum: 3.134

Publikationen

Zeitschriften, Konferenzen und Bücher:

2023
1. J. Zhao, Q. Yang, F. Dreyer, D. Krüger, F. Jelezko, und J. Anders, „A Broadband NMR Magnetometer System With Field Searching and Automatic Tuning Function“, IEEE Transactions on Instrumentation and Measurement, Bd. 72, S. 1–10, 2023, doi: 10.1109/TIM.2022.3222484.
  - BibTeX
  BibTeX
  @article{9953151, abstract = {In this article, we present a CMOS-based broadband nuclear magnetic resonance (NMR) magnetometer system with magnetic field searching and automatic tuning capabilities. The NMR front-end consists of a custom-designed NMR transceiver application-specific integrated circuit (ASIC) and an external $LC$ resonance circuit formed by an NMR coil and a digitally tunable capacitor (DTC). With a 1-mm NMR coil, the system is designed to measure the magnetic fields between 0.54 and 2.54 T with nanotesla resolution. To this end, the system automatically sweeps its excitation frequency to acquire an NMR signal from a known sample inside the NMR coil. The measured frequency of the NMR signal, together with the known Larmor frequency of the sample, can then be used to determine the unknown magnetic field with very high precision. The presented system provides an optimum sensitivity over its entire frequency range by automatically tuning the $LC$ resonant circuit to the current Larmor frequency using the DTC. With a 0.78- $\mu \text{L}$ sample of vegetable oil, the presented NMR magnetometer achieves an excellent field resolution of 1.77 nT inside a 1.45-T benchtop MR magnet, corresponding to a relative resolution of 1.2 ppb, which is limited by the field stability of the magnet. With its intrinsic frequency noise of 15 mHz, measured using a synthetic input signal, the presented sensor can support magnetic field resolutions down to 242 pT within a 1.45-T base field.}, author = {Zhao, Jianyu and Yang, Qing and Dreyer, Frederik and Krüger, Daniel and Jelezko, Fedor and Anders, Jens}, doi = {10.1109/TIM.2022.3222484}, issn = {1557-9662}, journal = {IEEE Transactions on Instrumentation and Measurement}, pages = {1-10}, title = {A Broadband NMR Magnetometer System With Field Searching and Automatic Tuning Function}, volume = 72, year = 2023 }
2. F. Dreyer, Q. Yang, B. Alnajjar, D. Krüger, B. Blümich, und J. Anders, „A portable chip-based NMR relaxometry system with arbitrary phase control for point-of-care blood analysis“, IEEE Transactions on Biomedical Circuits and Systems, S. 1–12, 2023, doi: 10.1109/TBCAS.2023.3287281.
  - BibTeX
  BibTeX
  @article{10155209, abstract = {In this paper, we present a portable NMR relaxometry system optimized for the point-of-care analysis of body liquids such as blood. The presented system is centered on an NMR-on-a-chip transceiver ASIC, a reference frequency generator with arbitrary phase control, and a custom-designed miniaturized NMR magnet with a field strength of 0.29 T and a total weight of 330 g. The NMR-ASIC co-integrates a low-IF receiver, a power amplifier, and a PLL-based frequency synthesizer on a total chip area of 1100 $\bm {\times }$ 900 $\mu$ m$\bm {^{2}}$. The arbitrary reference frequency generator enables the use of conventional CPMG and inversion sequences, as well as modified water-suppression sequences. Moreover, it is used to implement an automatic frequency lock to correct temperature-induced magnetic field drifts. Proof-of-concept measurements on NMR phantoms and human blood samples show an excellent concentration sensitivity of v$\bm {_\rm{c,min}}$ = 2.2 mM/$\bm {\sqrt{\rm{Hz}}}$. This very good performance renders the presented system an ideal candidate for the future NMR-based point-of-care detection of biomarkers such as the blood glucose concentration.}, author = {Dreyer, Frederik and Yang, Qing and Alnajjar, Belal and Krüger, Daniel and Blümich, Bernhard and Anders, Jens}, doi = {10.1109/TBCAS.2023.3287281}, issn = {1940-9990}, journal = {IEEE Transactions on Biomedical Circuits and Systems}, pages = {1-12}, title = {A portable chip-based NMR relaxometry system with arbitrary phase control for point-of-care blood analysis}, year = 2023 }
2022
1. F. Dreyer, Q. Yang, D. Krüger, und J. Anders, „A chip-based NMR relaxometry system for point-of-care analysis“, in 2022 IEEE Biomedical Circuits and Systems Conference (BioCAS), in 2022 IEEE Biomedical Circuits and Systems Conference (BioCAS). Okt. 2022, S. 183–187. doi: 10.1109/BioCAS54905.2022.9948623.
  - BibTeX
  BibTeX
  @inproceedings{9948623, abstract = {In this paper, we present a miniaturized NMR relaxometry system for the point-of-care analysis of body liquids, centered on an NMR-on-a-chip transceiver ASIC and a DDS-based reference frequency generator. The NMR ASIC is fabricated in a 0.13-µm SiGe BiCMOS technology. It co-integrates a low-IF receiver, a power amplifier, and a phase-locked loop on a small footprint of 1100 × 900 µm2. The presented system provides an excellent low-field concentration sensitivity of ${v_{{\text{c}},\min }} = 5.4{\text{mM}}/\sqrt {{\text{Hz}}} .$ The reference frequency generator provides an output signal with arbitrarily adjustable phase, enabling classical CPMG experiments as well as its modern adaptations. The system also includes an automatic frequency lock to prevent temperature-induced frequency drifts. Proof-of-concept NMR measurements on reference and biomedical samples demonstrate the excellent performance of the presented system as well as its applicability for future point-of-care analysis.}, author = {Dreyer, Frederik and Yang, Qing and Krüger, Daniel and Anders, Jens}, booktitle = {2022 IEEE Biomedical Circuits and Systems Conference (BioCAS)}, doi = {10.1109/BioCAS54905.2022.9948623}, issn = {2163-4025}, month = {10}, pages = {183-187}, title = {A chip-based NMR relaxometry system for point-of-care analysis}, year = 2022 }
2. Q. Yang, J. Zhao, F. Dreyer, D. Krüger, und J. Anders, „A portable NMR platform with arbitrary phase control and temperature compensation“, Magnetic Resonance, Bd. 3, Nr. 1, Art. Nr. 1, 2022, doi: 10.5194/mr-3-77-2022.
  - BibTeX
  - Link
  BibTeX
  @article{mr-3-77-2022, author = {Yang, Q. and Zhao, J. and Dreyer, F. and Kr\"uger, D. and Anders, J.}, doi = {10.5194/mr-3-77-2022}, journal = {Magnetic Resonance}, number = 1, pages = {77--90}, title = {A portable NMR platform with arbitrary phase control and temperature compensation}, url = {https://mr.copernicus.org/articles/3/77/2022/}, volume = 3, year = 2022 }
  Link
  https://mr.copernicus.org/articles/3/77/2022/

Qing Yang

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