Patent ID: 8390499

Claim:
An analog-to-digital converter comprising: an input terminal configured to receive an input signal; a first comparator configured to generate a first logical signal and a control signal by comparing the input signal with a first reference signal; a first output terminal configured to output the first logical signal; a second comparator configured to generate a second logical signal based on the input signal, a second reference signal, a third reference signal, and the control signal; and a second output terminal configured to output the second logical signal, the second comparator comprising: a terminal; a first transistor configured to generate a first current based on the input signal; a first switch configured to be short-circuited and open-circuited according to the control signal; a second switch configured to be switched so as to be short-circuited and open-circuited in an opposite manner to the first switch according to the control signal; a second transistor configured to supply a second current based on the second reference signal to the terminal when the first switch is ON; a third transistor configured to supply a third current based on the third reference signal to the terminal when the second switch is ON wherein one end of the first switch is connected to the terminal, one end of the second switch is connected to the terminal, one end of the second transistor is connected to the other end of the first switch, and one end of the third transistor is connected to the other end of the second switch; and an output unit configured to generate the second logical signal by comparing the first current with one of the second current and the third current supplied to the terminal.