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A High Precision CMOS Bandgap Reference Voltage

XU Binfu

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Abstract

A bandgap reference circuit with 2nd order temperature compensation is presented in the paper.In order to improve the power supply rejection ratio,a partial voltage which is relatively irrelevant to total voltage is used in the bandgap core,and in order to reduce the influence which caused by the offset voltage of operational amplifier,a serial-connected PN junction structure is used in the circuit too.The bandgap reference is implemented in a standard TSMC 0.18 μm CMOS process.Simulation results using HSpice tools show that the circuit has a high Power Supply Rejection Ratio(PSRR)and low temperature coefficient.

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What this paper is about

A bandgap reference circuit with 2nd order temperature compensation is presented in the paper.In order to improve the power supply rejection ratio,a partial voltage which is relatively irrelevant to total voltage is used in the bandgap core,and in order to reduce the influence which caused by the offset voltage of operational amplifier,a serial-connected PN junction structure is used in the circuit too.The bandgap reference is implemented in a standard TSMC 0.18 μm CMOS process.Simulation results using HSpice tools show that the circuit has a high Power Supply Rejection Ratio(PSRR)and low temperature coefficient.

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Available abstract

A bandgap reference circuit with 2nd order temperature compensation is presented in the paper.In order to improve the power supply rejection ratio,a partial voltage which is relatively irrelevant to total voltage is used in the bandgap core,and in order to reduce the influence which caused by the offset voltage of operational amplifier,a serial-connected PN junction structure is used in the circuit too.The bandgap reference is implemented in a standard TSMC 0.18 μm CMOS process.Simulation results using HSpice tools show that the circuit has a high Power Supply Rejection Ratio(PSRR)and low temperature coefficient.

Key concepts: Bandgap voltage reference, Power supply rejection ratio, Voltage reference, CMOS, Voltage, Input offset voltage, Silicon bandgap temperature sensor, Electrical engineering

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