Ultra-low power consumption 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-down reset functions, which integrates the functions of a power-on reset circuit and a power-down reset circuit, and realizes the reset function by using high and low levels output by a comparator. The change of the power supply voltage causes the charge-discharge effect of a capacitor, so that the input voltage at the two ends of the comparator is changed, different output levels are obtained, and the reset function is realized. By reasonably adjusting the size and capacitance of each MOS transistor, different power-on and power-off requirements, including power-on and power-off voltages and durations, and working in different voltage domains can be met, the power-on reset function and the power-off reset function are ingeniously combined, and meanwhile, nanoampere-level ultra-low standby power consumption can also be realized.

Description

technical field [0001] The invention relates to a circuit with ultra-low power consumption and functions of power-on reset and power-off reset. Background technique [0002] Power-on and brown-out reset circuits are included in many integrated circuits to ensure that analog and digital blocks are initialized to a known state after power is applied. 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 circuits all use the above circuits in combination, which further increases the area and power consumption. At present, the chip size and power supply v...

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

Images