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

Authors
Zawawi, Ruhaifi Bin AbdullahAbbasi, Wajahat H.Kim, Seung-HwanChoi, HojongKim, Jungsuk
Issue Date
Jun-2020
Publisher
MDPI
Keywords
bandgap voltage reference; inductive link; implantable biomedical; line regulation; wireless power telemetry
Citation
ENERGIES, v.13, no.11
Journal Title
ENERGIES
Volume
13
Number
11
URI
https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/25946
DOI
10.3390/en13112986
ISSN
1996-1073
1996-1073
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-mu m 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/degrees C in the temperature range of 25 to 100 degrees C.
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