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Ultra-High-Resistance Pseudo-Resistors with Small Variations in a Wide Symmetrical Input Voltage Swing
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.ORCID iD: 0000-0002-6749-9593
Institute of Microelectronics of Seville, IMSECNM (CSIC/University of Seville), Sevilla, Spain.ORCID iD: 0000-0003-2848-9226
2023 (English)In: IEEE Transactions on Circuits and Systems - II - Express Briefs, ISSN 1549-7747, E-ISSN 1558-3791, Vol. 70, no 8, p. 2794-2798Article in journal (Refereed) Published
Abstract [en]

This paper presents a new strategy and circuit configuration composed of serially-connected PMOS devices operating in the subthreshold region for implementing ultra-highvalue resistors required in very low-frequency active-RC filters and bio-amplifiers. Depending on the application, signal bandwidth for instance in bio-amplifiers may vary from a few mHz up to a maximum of 10 kHz. Three different resistor structures are proposed to achieve ultra-high resistance. While ranging in the order of several TY, the proposed ultra-high-resistance pseudoresistors occupy a small on-chip silicon area, which is one of the main issues in the design of analog front-end circuits in ultra-low power implantable biomedical microsystems. In addition, these ultra-high-value resistors lead to the use of a small capacitance to create a very small cut-off frequency. Therefore, the large area to implement capacitances is also considerably reduced. The proposed resistor structures have very small variations about 7% and 12% in a wide input voltage range (-0.5 V +0.5 V), thus significantly improving the total harmonic distortion of bioamplifiers and the analog front-end of the system. Simulation results of different circuits designed in a 180nm CMOS technology, are shown to demonstrate the advantages of the proposed ultra-high-resistance pseudo-resistors.

Place, publisher, year, edition, pages
IEEE , 2023. Vol. 70, no 8, p. 2794-2798
Keywords [en]
MOST-based resistors, low-voltage, low-power biomedical systems
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hig:diva-41223DOI: 10.1109/tcsii.2023.3258880ISI: 001043666500016Scopus ID: 2-s2.0-85151515976OAI: oai:DiVA.org:hig-41223DiVA, id: diva2:1745434
Available from: 2023-03-23 Created: 2023-03-23 Last updated: 2023-09-01Bibliographically approved

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Horestani, Fatemeh Karami

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