ZHANG R C,SUI J C,HE Z Q,et al. A low-cost high-precision undervoltage protection circuit[J]. Microelectronics & Computer,2024,41(7):74-80. doi: 10.19304/J.ISSN1000-7180.2023.0489
Citation: ZHANG R C,SUI J C,HE Z Q,et al. A low-cost high-precision undervoltage protection circuit[J]. Microelectronics & Computer,2024,41(7):74-80. doi: 10.19304/J.ISSN1000-7180.2023.0489

A low-cost high-precision undervoltage protection circuit

  • A low cost and high precision undervoltage protection circuit is proposed. The power supply sampling voltage, the negative to the absolute temperature voltage, and the positive to the absolute temperature voltage are dispersed in two different branches using a negative feedback circuit. By reasonably designing the resistance ratio, the output voltage difference of the two branches can simultaneously contain both the power supply sampling voltage and the precise bandgap reference voltage. After comparing the output voltage difference of the two branches using a comparator, the comparison between the power supply sampling voltage and the reference voltage is effectively realized. The circuit has a simple structure and avoids the use of auxiliary circuits such as start-up and bias circuits, accurately realizing the comparison between the power supply voltage and the reference voltage while achieving high precision and low cost. Based on the HHGRACE 0.11 μm process, the undervoltage protection circuit is designed and implemented. The post-simulation results show that when the power supply voltage is normal at 3.60 V and the rising and falling thundervoltage protection point is designed to be 2.50 V and 2.45 V respectively, under different process corners and temperature ranges of −40℃ to 125 ℃, the maximum deviation of the undervoltage point was 120 mV(6σ), the power consumption is 21 μW, and the total circuit area is 18000 μm2.
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