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Higher-Order Curvature-Compensated Bandgap Voltage Reference with High PSRR

Xiangzhan Wang

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Abstract

Based on the principle of piecewise compensation,a novel higher-order curvature compensation method for bandgap reference was presented.This method focused on forming multiple local extrema of reference voltage curve in the entire operating temperature range,which significantly improves the temperature independence.Results from simulation based on 0.5 μm CMOS process showed that the circuit had a temperature coefficient of 5.8×10-7 / ℃ in the temperature range from-40 ℃ to 135 ℃.By using an error amplifier with improved PSRR,the reference source,which operated at 5 V supply power,had a PSRR of-95.4 dB and-92.4 dB at dc and 1 kHz,respectively.

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What this paper is about

Based on the principle of piecewise compensation,a novel higher-order curvature compensation method for bandgap reference was presented.This method focused on forming multiple local extrema of reference voltage curve in the entire operating temperature range,which significantly improves the temperature independence.Results from simulation based on 0.5 μm CMOS process showed that the circuit had a temperature coefficient of 5.8×10-7 / ℃ in the temperature range from-40 ℃ to 135 ℃.By using an error amplifier with improved PSRR,the reference source,which operated at 5 V supply power,had a PSRR of-95.4 dB and-92.4 dB at dc and 1 kHz,respectively.

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Available abstract

Based on the principle of piecewise compensation,a novel higher-order curvature compensation method for bandgap reference was presented.This method focused on forming multiple local extrema of reference voltage curve in the entire operating temperature range,which significantly improves the temperature independence.Results from simulation based on 0.5 μm CMOS process showed that the circuit had a temperature coefficient of 5.8×10-7 / ℃ in the temperature range from-40 ℃ to 135 ℃.By using an error amplifier with improved PSRR,the reference source,which operated at 5 V supply power,had a PSRR of-95.4 dB and-92.4 dB at dc and 1 kHz,respectively.

Key concepts: Power supply rejection ratio, Bandgap voltage reference, Voltage reference, Materials science, Temperature coefficient, Compensation (psychology), Curvature, Voltage

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