Comparator, oscillator, and power converter

A comparator that operates by receiving supply of a first voltage and a second voltage, the comparator comprising:

• a differential amplifier circuit that is connected to a first power supply node supplying the first voltage through first and second nodes and generates a first current and a second current in the first node and the second node, respectively, the first current and the second current having a current difference obtained by amplifying a voltage difference between an input voltage and a reference voltage predetermined between the first and second voltages;
• a current source circuit that is connected in series with the differential amplifier circuit through a third node between the first power supply node and a second power supply node supplying the second voltage and generates a third current that is a sum of the first and second currents in the third node;
• an output stage that is connected between an output node and the first power supply node and has current drive force to generate a first output current proportional to the first current between the first power supply node and the output node;
• a current conversion circuit to have current drive force generating a second output current proportional to the second current between the second power supply node and the output node;
• a minimum selector circuit that is connected between an output complementary node and the first power supply node and causes the output complementary node to generate current proportional to a minimum current of the first and second currents;
• and
• a latch circuit connected between the output node and the output complementary node and the second power supply node,
• wherein the latch circuit executes a reset operation in which each of the output node and the output complementary node is electrically connected to the second power supply node in response to a reset signal, and executes a positive feedback latch operation in which a change, generated in the output node, from the second voltage to the first voltage is amplified when a high and low relationship between the input voltage and the reference voltage is reversed from a cancellation time point of the reset operation while the output node and the output complementary node are electrically disconnected from the second power supply node during a circuit operation after cancellation of the reset operation, and fixes voltage at the output node to the first voltage while fixing voltage at the output complementary node to the second voltage until the reset signal is input next time.