A High Performance Reference Circuit with Optimized Input Offset Operational Amplifier using Device Mismatch Model

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A High Performance Reference Circuit with Optimized Input Offset Operational Amplifier using Device Mismatch Model

Kapil K. Rajput,Sanjay Kumar Singh,Ravi Saini,Anil Saini-2013-04-15

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TL;DRAbstract

In this paper, author describes a band gap reference (BGR) circuit, having reference voltage 1.20V with maximum temperature coefficient of 63 ppm/ 0 C in temperature range of –40 to 120 0 C. The circuit operates in range of supply voltage, 3.0V to 3.6V. An operational amplifier (op-amp), whose input offset voltage is reduced upto 892 µV using Pelgrom’s device mismatch model is used in BGR. The power supply rejection ratio of circuit is improved at higher frequency and achieved 36 dB at 1 MHz. The circuit having area of 0.45 mm 2 in 0.35 µm CMOS technology is designed, fabricated and tested successfully.

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In this paper, author describes a band gap reference (BGR) circuit, having reference voltage 1.20V with maximum temperature coefficient of 63 ppm/ 0 C in temperature range of –40 to 120 0 C. The circuit operates in range of supply voltage, 3.0V to 3.6V. An operational amplifier (op-amp), whose input offset voltage is reduced upto 892 µV using Pelgrom’s device mismatch model is used in BGR. The power supply rejection ratio of circuit is improved at higher frequency and achieved 36 dB at 1 MHz. The circuit having area of 0.45 mm 2 in 0.35 µm CMOS technology is designed, fabricated and tested successfully.

Keywords

Input offset voltageBandgap voltage referenceOffset (computer science)Voltage referenceOperational amplifierCMOSElectrical engineeringVoltage

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