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A Precise CMOS Bandgap Voltage Reference with High PSRR

Fook Liang Heng

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Abstract

A precise CMOS bandgap voltage reference with high power supply rejection ratio (PSRR) is proposed in this paper. The circuit is fabricated with the 0.6um 5V CMOS process. The voltage supply is 3V. A regulated PMOS current source is applied to the reference core to improve the PSRR. The simulation results show that the circuit has a good PSRR of - 88dB at low frequency. The temperature coefficient is low to 3.5ppm and the output voltage variation is only 0.65mV over the temperature range from - 40℃ to 120℃.

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What this paper is about

A precise CMOS bandgap voltage reference with high power supply rejection ratio (PSRR) is proposed in this paper. The circuit is fabricated with the 0.6um 5V CMOS process. The voltage supply is 3V. A regulated PMOS current source is applied to the reference core to improve the PSRR. The simulation results show that the circuit has a good PSRR of - 88dB at low frequency. The temperature coefficient is low to 3.5ppm and the output voltage variation is only 0.65mV over the temperature range from - 40℃ to 120℃.

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Available abstract

A precise CMOS bandgap voltage reference with high power supply rejection ratio (PSRR) is proposed in this paper. The circuit is fabricated with the 0.6um 5V CMOS process. The voltage supply is 3V. A regulated PMOS current source is applied to the reference core to improve the PSRR. The simulation results show that the circuit has a good PSRR of - 88dB at low frequency. The temperature coefficient is low to 3.5ppm and the output voltage variation is only 0.65mV over the temperature range from - 40℃ to 120℃.

Key concepts: Power supply rejection ratio, Bandgap voltage reference, PMOS logic, Voltage reference, CMOS, Computer science, Electrical engineering, Voltage

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