Wide-Supply-Voltage-Range CMOS Bandgap Reference for In Vivo Wireless Power Telemetry

Ruhaifi Bin Abdullah Zawawi, Wajahat H. Abbasi, Seung-Hwan Kim, Hojong Choi and Jungsuk Kim
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Ruhaifi Bin Abdullah Zawawi: Department of Health Science and Technology, Gachon Advanced Institute for Health Sciences & Technology, Incheon 21999, Korea
Wajahat H. Abbasi: Department of Health Science and Technology, Gachon Advanced Institute for Health Sciences & Technology, Incheon 21999, Korea
Seung-Hwan Kim: R&D Center, Metabiomed Corporation, 215 Osongsaenmyeong1-ro, Chenongu 28161, Korea
Hojong Choi: Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, 350-27, Gum-daero, Gumi 39253, Korea
Jungsuk Kim: Department of Biomedical Engineering, Gachon University, 534-2 Hambakmoe-ro, Incheon 21936, Korea

Energies, 2020, vol. 13, issue 11, 1-14

Abstract: The robustness of the reference circuit in a wide range of supply voltages is crucial in implanted devices. Conventional reference circuits have demonstrated a weak performance over wide supply ranges. Channel-length modulation in the transistors causes the circuit to be sensitive to power supply variation. To solve this inherent problem, this paper proposes a new output-voltage-line-regulation controller circuit. When a variation occurs in the power supply, the controller promptly responds to the supply deviation and removes unwanted current in the output path of the reference circuit. The proposed circuit was implemented in a 0.35-μm SK Hynix CMOS standard process. The experimental results demonstrated that the proposed reference circuit could generate a reference voltage of 0.895 V under a power supply voltage of 3.3 V, line regulation of 1.85 mV/V in the supply range of 2.3 to 5 V, maximum power supply rejection ratio (PSRR) of −54 dB, and temperature coefficient of 11.9 ppm/°C in the temperature range of 25 to 100 °C.

Keywords: bandgap voltage reference; inductive link; implantable biomedical; line regulation; wireless power telemetry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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