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A Novel CMOS Bandgap Reference

Zhendao Wang

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Abstract

The normal band-gap low voltage reference circuit always adopt PNP to produce ΔVbe,however the offset voltage of the OPA directly influences the precision of the output voltage reference.The design of a 30×10-6/℃ CMOS bandgap voltage reference with low power supply voltage in temperature compensation and with the NPN to produce ΔVbe technology is described.The band-gap reference is implemented in SMIC 0.18μm CMOS process leading to an output voltage of about 1.24V.Simulation shows the average temperature coefficient is 30×10-6/℃ in the range from-40℃ to +120℃,PSRR is-88dB at 27℃ and voltage level bias characteristic is 31.2×10-6/ V.

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What this paper is about

The normal band-gap low voltage reference circuit always adopt PNP to produce ΔVbe,however the offset voltage of the OPA directly influences the precision of the output voltage reference.The design of a 30×10-6/℃ CMOS bandgap voltage reference with low power supply voltage in temperature compensation and with the NPN to produce ΔVbe technology is described.The band-gap reference is implemented in SMIC 0.18μm CMOS process leading to an output voltage of about 1.24V.Simulation shows the average temperature coefficient is 30×10-6/℃ in the range from-40℃ to +120℃,PSRR is-88dB at 27℃ and voltage level bias characteristic is 31.2×10-6/ V.

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Available abstract

The normal band-gap low voltage reference circuit always adopt PNP to produce ΔVbe,however the offset voltage of the OPA directly influences the precision of the output voltage reference.The design of a 30×10-6/℃ CMOS bandgap voltage reference with low power supply voltage in temperature compensation and with the NPN to produce ΔVbe technology is described.The band-gap reference is implemented in SMIC 0.18μm CMOS process leading to an output voltage of about 1.24V.Simulation shows the average temperature coefficient is 30×10-6/℃ in the range from-40℃ to +120℃,PSRR is-88dB at 27℃ and voltage level bias characteristic is 31.2×10-6/ V.

Key concepts: Bandgap voltage reference, Voltage reference, CMOS, Power supply rejection ratio, Voltage, Input offset voltage, Electrical engineering, Temperature coefficient

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