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An Improved CMOS Bandgap Reference with Self-Biased Cascoded Current Mirrors

Yongxue Zhang

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Abstract

In this paper,an improved cascoding CMOS bandgap reference(BGR) without opamp is presented.By incorporating a simple feedback transistor and several resistors into conventional cascoding circuit,the power-supply rejection and 2nd-order curvature compensation circuit is formed.With Spectre tool and 0.35μm CMOS model,the simulation has been carried out and the results show that the PSRR and temperature performance are both improved evidently.PSRR of the improved BGR is 93dB at DC and the TC is 7ppm/℃ over the temperature range of-40～+125℃,respectively.

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What this paper is about

In this paper,an improved cascoding CMOS bandgap reference(BGR) without opamp is presented.By incorporating a simple feedback transistor and several resistors into conventional cascoding circuit,the power-supply rejection and 2nd-order curvature compensation circuit is formed.With Spectre tool and 0.35μm CMOS model,the simulation has been carried out and the results show that the PSRR and temperature performance are both improved evidently.PSRR of the improved BGR is 93dB at DC and the TC is 7ppm/℃ over the temperature range of-40～+125℃,respectively.

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Available abstract

In this paper,an improved cascoding CMOS bandgap reference(BGR) without opamp is presented.By incorporating a simple feedback transistor and several resistors into conventional cascoding circuit,the power-supply rejection and 2nd-order curvature compensation circuit is formed.With Spectre tool and 0.35μm CMOS model,the simulation has been carried out and the results show that the PSRR and temperature performance are both improved evidently.PSRR of the improved BGR is 93dB at DC and the TC is 7ppm/℃ over the temperature range of-40～+125℃,respectively.

Key concepts: Power supply rejection ratio, Bandgap voltage reference, CMOS, Resistor, Current mirror, Computer science, Compensation (psychology), Transistor

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