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2007•MicroelectronicsOpen access

2nd-Order Compensated Low Voltage CMOS Bandgap Voltage Reference

WU Zhi-ming

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Abstract

A low-voltage CMOS bandgap reference with second-order compensation using a temperature-dependent resistor ratio was presented.Resistor strings for temperature compensation were used to level-shift up the DC voltage at the inputs of the operational amplifier such that supply voltage can be reduced.Simulation results show that the circuit delivers an output voltage of 1.165 V and achieves a temperature coefficient of 4.5 ppm/°C over the range from-40 ℃ to 125 ℃,and a power supply rejection ratio of 60.6 dB.The proposed voltage reference source can operate down to a 1.5 V supply and consumes a maximum supply current of 15 μA.

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A low-voltage CMOS bandgap reference with second-order compensation using a temperature-dependent resistor ratio was presented.Resistor strings for temperature compensation were used to level-shift up the DC voltage at the inputs of the operational amplifier such that supply voltage can be reduced.Simulation results show that the circuit delivers an output voltage of 1.165 V and achieves a temperature coefficient of 4.5 ppm/°C over the range from-40 ℃ to 125 ℃,and a power supply rejection ratio of 60.6 dB.The proposed voltage reference source can operate down to a 1.5 V supply and consumes a maximum supply current of 15 μA.

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Available abstract

A low-voltage CMOS bandgap reference with second-order compensation using a temperature-dependent resistor ratio was presented.Resistor strings for temperature compensation were used to level-shift up the DC voltage at the inputs of the operational amplifier such that supply voltage can be reduced.Simulation results show that the circuit delivers an output voltage of 1.165 V and achieves a temperature coefficient of 4.5 ppm/°C over the range from-40 ℃ to 125 ℃,and a power supply rejection ratio of 60.6 dB.The proposed voltage reference source can operate down to a 1.5 V supply and consumes a maximum supply current of 15 μA.

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

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