Comparator capable of preventing large noise voltage

A comparator having first and second voltage input terminals and a voltage output terminal, for comparing a first input voltage from said first voltage input terminal and a second input voltage from said second voltage input terminal to produce and supply an output voltage to said voltage output terminal, said comparator comprising:

• a first current mirror circuit having a first current input terminal and a first current output terminal;
• a first field-effect transistor having a first drain electrode connected to said first current input terminal, a first source electrode connected to a first power terminal, and a first gate electrode connected to said first voltage input terminal, said first power terminal supplied with a low voltage having a low level;
• a second field-effect transistor having a second drain electrode connected to said first current output terminal, a second source electrode connected to said first power terminal, and a second gate electrode connected to said second voltage input terminal;
• and
• a second current mirror circuit having a second current input terminal connected to said first current output terminal and a second current output terminal connected to a second power terminal through a resistor and to said voltage output terminal, said second power terminal supplied with a high voltage having a high level which is higher than said low level.