Title: Curvature-correction in the bandgap voltage reference based on thermal compensation of beta and base-emitter voltage

Authors: Vinayak Hande; Maryam Shojaei Baghini

Addresses: Department of Electrical Engineering, Indian Institute of Technology – Bombay, Mumbai, MH, India ' Department of Electrical Engineering, Indian Institute of Technology – Bombay, Mumbai, MH, India

Abstract: A novel current-mode bandgap voltage reference circuit is presented. The proposed architecture exhibits the curvature compensation ability. The curvature compensation is achieved by utilising the nonlinear behaviour of forward current gain (β) to compensate nonlinear temperature dependence of base-emitter voltage (VBE). The proposed voltage reference is analysed theoretically and compared with other existing methods. The circuit is designed and simulated in standard 180 nm mixed mode CMOS technology which gives a bandgap reference level of 1.243 V. The minimum required supply voltage is 1.5 V. The maximum current drawn from VDD is 3.8 µA. A temperature coefficient of 4.5 ppm/°C is achieved over −25°C to 125°C temperature range. Variation in reference voltage is ± 15 mV across process corners. The reference circuit exhibits −65 dB low-frequency PSNA at 10 Hz with line sensitivity of 5 mV/V.

Keywords: bandgap voltage reference; curvature compensation; temperature coefficient; forward current gain; base-emitter voltage; circuit design; simulation.

DOI: 10.1504/IJCAD.2016.075900

International Journal of Circuits and Architecture Design, 2016 Vol.2 No.1, pp.50 - 67

Received: 27 Dec 2014
Accepted: 16 Jul 2015
Published online: 12 Apr 2016 *

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