Zero static power consumption undervoltage detection circuit

A technology of undervoltage detection and static power consumption, which is applied in the direction of measuring electrical variables, measuring devices, measuring current/voltage, etc., can solve the problem that low power consumption applications are not suitable, the reference voltage and comparator working status are difficult to guarantee, and increase Resistor area and other issues

Pending Publication Date: 2019-07-05
南京芯耐特半导体有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The resistance and comparator of the commonly used power-off detection circuit structure consume DC power consumption during normal operation. Increasing the resistance can reduce the static power consumption of the resistance voltage divider, but it also inevitably increases the resistance area. In low-power applications inappropriate
Moreover, in applications where the power supply voltage is relatively low, it is difficult to guarantee the working status of the reference voltage and the comparator, which makes this structure not suitable for low-voltage applications

Method used

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  • Zero static power consumption undervoltage detection circuit
  • Zero static power consumption undervoltage detection circuit
  • Zero static power consumption undervoltage detection circuit

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Embodiment Construction

[0019] The content of the present invention will be further described below in conjunction with the accompanying drawings of the description. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them.

[0020] Such as figure 2 As shown, this embodiment provides an undervoltage detection circuit with zero static power consumption,

[0021] Including PMOS transistors PM1, PM2 and PM3; NMOS transistors NM1 and NM2;

[0022] Phase devices I1 and I2; capacitor CP and power supply voltage VDD.

[0023] PM1, connected to the power supply voltage VDD, the output voltage Vp;

[0024] CP, connected in series with PM1;

[0025] CMOS inverter 1, composed of power supply voltage VDD, PM2 and NM1 in series, output voltage Va;

[0026] CMOS inverter 2, composed of power supply voltage VDD, PM3 and NM2 connected in series, input voltage Va;

[0027] The two-stage inverter is composed of I1 and I2 connected in series, and outputs an...

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Abstract

The invention provides a zero static power consumption undervoltage detection circuit, which comprises PMOS tubes PM1, PM2 and PM3; NMOS tubes NM1 and NM2; phase inverters I1 and I2; and a capacitor CP and a power voltage VDD, and can be applied to an SOC chip or an analog chip to provide a reset signal in a power-off process. The undervoltage detection circuit has no static power consumption under a normal working state, and a threshold value of the power voltage can be set to be extremely low; and the undervoltage detection circuit can be applied in a low-voltage environment.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and in particular relates to an undervoltage detection circuit with zero static power consumption. Background technique [0002] Such as figure 1 As shown, in the commonly used power-off and undervoltage detection circuit structure, three series resistors are used to generate a divided voltage. The positive input terminal of the comparator is connected to a voltage division point, and the negative input terminal is connected to the reference reference voltage. After being shaped by the inverter, an undervoltage detection signal is generated, and it is valid when it is low. At the same time, the signal terminal is connected to the gate of the NMOS transistor, and the drain of the NMOS transistor is connected to the second voltage dividing point of the voltage dividing resistor. The source end of the NMOS transistor and one end of the third resistor are commonly grounded. When the detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
CPCG01R19/16519
Inventor 庄在龙
Owner 南京芯耐特半导体有限公司
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