A band-gap voltage reference for interface circuit of microsensor |
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Authors: | CAO Yi-jiang XiaoFei and ZHANG Er-dong |
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Affiliation: | ( Dept. of Electronic Science and Technology,College of Applied Science,Harbin University of Science and Technology,Harbin 150080, China) |
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Abstract: | A high performance CMOS band-gap voltage reference circuit that can be used in interface integrated circuit of microsenser and compatible with 0.6 μm (double poly) mix process is proposed in this paper.The circuit can be employed in the range of 1.8-8 V and carry out the first-order PTAT (proportional to absolute temperature) temperature compensation.Through using a two-stage op-amp with a NMOS input pair as a negative feedback op-amp,the PSRR (power supply rejection ratio) of the entire circuit is increased,and the temperature coefficient of reference voltage is decreased.Results from HSPICE simulation show that the PSRR is -72.76 dB in the condition of low-frequency,the temperature coefficient is 2.4×10-6 in the temperature range from-10 ℃ to 90℃ and the power dissipation is only 14 μW when the supply voltage is 1.8 V. |
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Keywords: | microsensor band-gap voltage reference temperature coefficient PSRR |
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