A system for monitoring a voltage level comprising: a comparator circuit with a differential amplifier and comprising a first input terminal which is a non-inverting input terminal, a second input terminal which is an inverting input terminal, a first output terminal connected to a first output of the differential amplifier, and a second output terminal connected to a second output of the differential amplifier; and a voltage monitoring circuit comprising a first input monitoring terminal , a second monitoring input terminal , an output monitoring terminal , a first resistive element , a second resistive element , and a n-type monitoring transistor , wherein the first input monitoring terminal is configured to receive a monitored voltage level (V monitor ), wherein the first input terminal is configured to receive a reference voltage (V ref ), wherein the second monitoring input terminal is connected to a gate of the n-type monitoring transistor and the first output terminal , and the output monitoring terminal is connected to a source of the n-type monitoring transistor and the second input terminal to form a closed loop circuit, wherein the first resistive element is connected between the first input monitoring terminal and a drain of the n-type monitoring transistor wherein the second resistive element is connected between the source of the n-type monitoring transistor and ground; wherein a monitoring threshold is set based on a resistance value of the first resistive element , a resistance value of the second resistive element , and the reference voltage (V ref ); wherein the second output terminal is configured to indicate whether the monitored voltage is equal to or exceeds the monitoring threshold. a comparator circuit with a differential amplifier and comprising a first input terminal which is a non-inverting input terminal, a second input terminal which is an inverting input terminal, a first output terminal connected to a first output of the differential amplifier, and a second output terminal connected to a second output of the differential amplifier; and a voltage monitoring circuit comprising a first input monitoring terminal , a second monitoring input terminal , an output monitoring terminal , a first resistive element , a second resistive element , and a n-type monitoring transistor , wherein the first input monitoring terminal is configured to receive a monitored voltage level (V monitor ), wherein the first input terminal is configured to receive a reference voltage (V ref ), wherein the second monitoring input terminal is connected to a gate of the n-type monitoring transistor and the first output terminal , and the output monitoring terminal is connected to a source of the n-type monitoring transistor and the second input terminal to form a closed loop circuit, wherein the first resistive element is connected between the first input monitoring terminal and a drain of the n-type monitoring transistor wherein the second resistive element is connected between the source of the n-type monitoring transistor and ground; wherein a monitoring threshold is set based on a resistance value of the first resistive element , a resistance value of the second resistive element , and the reference voltage (V ref ); wherein the second output terminal is configured to indicate whether the monitored voltage is equal to or exceeds the monitoring threshold. <EOS>