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Design of high PSRR bandgap voltage reference

Tiecheng Gao

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Abstract

A bandgap voltage reference circuit is designed which has high power supply rejection ratio(PSRR)and low temperature coefficient.In the design,the whole bandgap circuit has high PSRR through using Folded Cas-code Operational Amplifier as the next stage.Based on the TSMC 0.18 μm CMOS model,the simulation re-sults using HSPICE show that the temperature coefficient of the circuit is 9.69 × 10-6/℃ between the tempera-ture range of-25-115 ℃ and the PSRR is-100 dB.The bandgap output voltage Vref swing is 0.2 mV when the supply voltage is 2.5-4.5 V.Therefore,the design is an effective way to implement a bandgap voltage ref-erence.

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What this paper is about

A bandgap voltage reference circuit is designed which has high power supply rejection ratio(PSRR)and low temperature coefficient.In the design,the whole bandgap circuit has high PSRR through using Folded Cas-code Operational Amplifier as the next stage.Based on the TSMC 0.18 μm CMOS model,the simulation re-sults using HSPICE show that the temperature coefficient of the circuit is 9.69 × 10-6/℃ between the tempera-ture range of-25-115 ℃ and the PSRR is-100 dB.The bandgap output voltage Vref swing is 0.2 mV when the supply voltage is 2.5-4.5 V.Therefore,the design is an effective way to implement a bandgap voltage ref-erence.

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Available abstract

A bandgap voltage reference circuit is designed which has high power supply rejection ratio(PSRR)and low temperature coefficient.In the design,the whole bandgap circuit has high PSRR through using Folded Cas-code Operational Amplifier as the next stage.Based on the TSMC 0.18 μm CMOS model,the simulation re-sults using HSPICE show that the temperature coefficient of the circuit is 9.69 × 10-6/℃ between the tempera-ture range of-25-115 ℃ and the PSRR is-100 dB.The bandgap output voltage Vref swing is 0.2 mV when the supply voltage is 2.5-4.5 V.Therefore,the design is an effective way to implement a bandgap voltage ref-erence.

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

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