Chopper type comparator

1. A chopper type comparator, comprising:

a first switch for supplying a first voltage to a first node in an analog input period;

a second switch for supplying a second voltage to the first node in a comparison period;

a capacitor connected between a second node and the first node;

an inverter which inverts and amplifies a voltage of the second node and outputs the voltage to a third node, the inverter being configured as a CMOS inverter including a combination of a first p-channel MOS transistor and a first n-channel MOS transistor;

a third switch for short-circuiting between the second and the third nodes in the analog input period;

a second p-channel MOS transistor which is connected in parallel to the first p-channel MOS transistor in the analog input period, and disconnected from the first p-channel MOS transistor in the comparison period; and

a second n-channel MOS transistor which is connected in parallel to the first n-channel MOS transistor in the analog input period, and disconnected from the first n-channel MOS transistor in the comparison period.

2. The chopper type comparator according to claim 1 , wherein the second p-channel MOS transistor and the second n-channel MOS transistor are each composed of two or more transistors connected in parallel.

3. A chopper type comparator, comprising:

a first switch for supplying an analog signal voltage to a first node;

a second switch for supplying a reference voltage to the first node;

a CMOS inverter for inverting an input voltage, the CMOS inverter including a first p-channel MOS transistor and a first n-channel MOS transistor;

a capacitor connected between the first node and an input node of the CMOS inverter;

a third switch for short-circuiting between an output node and the input node of the CMOS inverter;

a second p-channel MOS transistor and a second n-channel MOS transistor which are connected in parallel to the first p-channel MOS transistor and the first n-channel MOS transistor, respectively; and

a fourth switch for disconnecting the second p-channel MOS transistor and the second n-channel MOS transistor from the first p-channel MOS transistor and the first n-channel MOS transistor, respectively.

4. The chopper type comparator according to claim 3 , further comprising at least one p-channel MOS transistor and at least one n-channel MOS transistor, which are connected in parallel to the second p-channel MOS transistor and the second n-channel MOS transistor, respectively,

wherein the fourth switch disconnects the second p-channel MOS transistor, the second n-channel MOS transistor, the at least one p-channel MOS transistor and the at least one n-channel MOS transistor from the first p-channel MOS transistor and the first n-channel MOS transistor.

5. The chopper type comparator according to claim 3 , each of the first through fourth switches includes a receiving portion to receive a switching control signal to perform switching in accordance with the switching control signal.