Undervoltage detection circuit applicable to low voltage environment
An under-voltage detection and low-voltage technology, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of reference reference voltage and comparator working status, which are difficult to guarantee, not applicable, and increase the resistance area.
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[0021] The content of the present invention will be further described below in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0022] Such as figure 2 As shown, this embodiment provides an undervoltage detection circuit that can be applied to a low-voltage environment, including a PMOS tube PM1; NMOS tubes NM1 and NM2; inverters I1 and I2; a capacitor CP and a power supply voltage VDD.
[0023] PM1, connect to power supply voltage VDD, output voltage VP;
[0024] NM2, input voltage VP;
[0025] NM1, NM2, output voltage VQ;
[0026] CP, one end is connected to the power supply voltage VDD, the other end is connected in series with NM1 and NM2 respectively;
[0027] Two-stage inverter, formed by connecting I1 and I2 in series, input voltage VP signal, output undervoltage control signal;
[0028] PM1 is connected in series with NM2 and two-st...
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