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An 18.5nW, 62.9dB PSRR, Switched-Capacitor Bandgap Voltage Reference using Low Power Clock Generator Circuit for Biomedical Applications | IEEE Conference Publication | IEEE Xplore

An 18.5nW, 62.9dB PSRR, Switched-Capacitor Bandgap Voltage Reference using Low Power Clock Generator Circuit for Biomedical Applications


Abstract:

This paper proposes a switched-capacitor network (SCN) based fractional bandgap voltage reference (BGR) circuit designed in 180nm CMOS process to achieve high accuracy an...Show More

Abstract:

This paper proposes a switched-capacitor network (SCN) based fractional bandgap voltage reference (BGR) circuit designed in 180nm CMOS process to achieve high accuracy and low power consumption for implantable biomedical applications. The design proposes a V_{EB} generator that employs a 2x charge pump and an improved SCN to generate a temperature inde-pendent reference voltage (V_{REF})’. A low-power clock generator circuit is proposed, which reduces the leakage current by 37 % compared to previous works, thereby reducing the circuit's power consumption to 18.5nW at typical conditions. The design works from a supply voltage of 0.5V and has a TC of 74. Sppm/ {}^{\circ} \mathrm{C} over a temperature range of 0-80^{\circ} \mathrm{C}. The PSRR of the circuit is -62.9dB at 100Hz. Based on the Monte Carlo simulations of 500 samples, we obtain an untrimmed 3\sigma/\mu of 2.6%. The design occupies an active area of 0.027mm2.
Date of Conference: 21-25 May 2023
Date Added to IEEE Xplore: 21 July 2023
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Conference Location: Monterey, CA, USA

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