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A New Opamp-less CMOS Bandgap Voltage Reference Circuit

Feng Shu, Wan Yonglu, Yuelong Zhang

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Abstract

Theory of bandgap reference voltage and conventional bandgap reference circuits were presented,and a novel bandgap reference circuit without op-amp was designed.In the circuit,MOS current mirrors and negative feedback clamping technique were used to avoid the use of operational amplifier,thus eliminating effects of offset and power supply rejection ratio(PSRR) of the operational amplifier on accuracy of bandgap voltage reference.Based on 0.18 μm standard CMOS process,the circuit was simulated using Spectre of Cadence.Simulation results showed that the bandgap voltage reference circuit had a temperature coefficient of 6.73×10-6/℃ in the temperature range from-40 ℃ to 125 ℃,and a PSRR of 54.8 dB,and it consumed 0.25 mW of power from 2.5 V supply.

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What this paper is about

Theory of bandgap reference voltage and conventional bandgap reference circuits were presented,and a novel bandgap reference circuit without op-amp was designed.In the circuit,MOS current mirrors and negative feedback clamping technique were used to avoid the use of operational amplifier,thus eliminating effects of offset and power supply rejection ratio(PSRR) of the operational amplifier on accuracy of bandgap voltage reference.Based on 0.18 μm standard CMOS process,the circuit was simulated using Spectre of Cadence.Simulation results showed that the bandgap voltage reference circuit had a temperature coefficient of 6.73×10-6/℃ in the temperature range from-40 ℃ to 125 ℃,and a PSRR of 54.8 dB,and it consumed 0.25 mW of power from 2.5 V supply.

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Available abstract

Theory of bandgap reference voltage and conventional bandgap reference circuits were presented,and a novel bandgap reference circuit without op-amp was designed.In the circuit,MOS current mirrors and negative feedback clamping technique were used to avoid the use of operational amplifier,thus eliminating effects of offset and power supply rejection ratio(PSRR) of the operational amplifier on accuracy of bandgap voltage reference.Based on 0.18 μm standard CMOS process,the circuit was simulated using Spectre of Cadence.Simulation results showed that the bandgap voltage reference circuit had a temperature coefficient of 6.73×10-6/℃ in the temperature range from-40 ℃ to 125 ℃,and a PSRR of 54.8 dB,and it consumed 0.25 mW of power from 2.5 V supply.

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

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