An ultra-low power circuit with power-on reset and power-down reset functions

Abstract

The invention discloses an ultra-low power consumption circuit with power-on reset and power-off reset functions, which integrates the functions of the power-on reset circuit and the power-off reset circuit, and uses the high and low levels output by the comparator to realize the reset Function. The change of the power supply voltage will cause the charging and discharging effect of the capacitor, so as to change the input voltage at both ends of the comparator to obtain different output levels and realize the reset function. Reasonable adjustment of the size and capacitance of each MOS tube can meet different power-on and power-off requirements, including power-on, power-off voltage and duration, and work in different voltage domains, power-on reset and power-off reset functions. Ingeniously combined, it can also achieve ultra-low standby power consumption at the nano-amp level.

Description

technical field [0001] The invention relates to a circuit with ultra-low power consumption and simultaneously with power-on reset and power-down reset functions. Background technique [0002] Power-on and power-down reset circuits are included in many integrated circuits to ensure that analog and digital blocks initialize to a known state after power is applied. However, a common reset circuit, such as an RC reset circuit, can be reset when powered on, but cannot be reset effectively when powered off, and it also occupies a large layout area. Although other types of reset circuits can achieve power-on reset and power-off reset, they cannot take into account the power-on and power-on voltage, duration, and requirements for adapting to different voltage domains, and even generate large standby power consumption. The current circuits all use the above circuits in combination, which further increases the area and power consumption. At present, the chip size and power supply vo...

AI Technical Summary

Problems solved by technology

However, common reset circuits such as RC reset circuits can complete the reset when the power is turned on, but cannot be effectively reset when the power is turned off, and also occupy a large layout area.

Although other types of reset circuits can achieve power-on reset and power-off reset, they cannot take into account the power-on and power-off voltage, duration, and the requirements of different voltage domains, and even generate large standby power consumption.

The current circuit is a combination of the above circuits, which further increases the area and power consumption

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