Indian Journal of Engineering & Materials Sciences

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Bandgap current reference using widlar current source


Affiliations
1 Electronics and Communication Engineering Division, Netaji Subhas University of Technology, New Delhi 110078, India
2 Electronics and Communication Engineering Department, Bharati Vidyapeeth’s College of Engineering, New Delhi 110063, India
3 Electronics and Communication Engineering Department, Indira Gandhi Delhi Technological University for Woman, Delhi 110006, India

This paper has proposed a temperature insensitive current reference (CR) using Widlar current source. This CR has overwhelmed the direct relation of current to temperature present in Widlar current source. To obtain temperature insensitivity the proposed CR has been combined the complementary temperature behavior of current across MOSFET and BJT. Eldospice has supported the simulations of the proposed circuit using level 53, 0.18 µm CMOS technology with the help of EldoSpice. The proposed circuit has presented almost constant reference current of 63µA at a supply voltage of 1.8V for a temperature range of -30 to 100 °C. The proposed circuit has shown the maximum variation of 0.1µA as compared to 24.87µA in conventional Widlar current source.
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  • Bandgap current reference using widlar current source

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Authors

Bhawna Aggarwal
Electronics and Communication Engineering Division, Netaji Subhas University of Technology, New Delhi 110078, India
Yogita Arora
Electronics and Communication Engineering Department, Bharati Vidyapeeth’s College of Engineering, New Delhi 110063, India
Jasdeep Kaur Dhona
Electronics and Communication Engineering Department, Indira Gandhi Delhi Technological University for Woman, Delhi 110006, India

Abstract


This paper has proposed a temperature insensitive current reference (CR) using Widlar current source. This CR has overwhelmed the direct relation of current to temperature present in Widlar current source. To obtain temperature insensitivity the proposed CR has been combined the complementary temperature behavior of current across MOSFET and BJT. Eldospice has supported the simulations of the proposed circuit using level 53, 0.18 µm CMOS technology with the help of EldoSpice. The proposed circuit has presented almost constant reference current of 63µA at a supply voltage of 1.8V for a temperature range of -30 to 100 °C. The proposed circuit has shown the maximum variation of 0.1µA as compared to 24.87µA in conventional Widlar current source.