Patent ID: 7605634

Claim:
A subtractor circuit for outputting an output voltage as a difference between a first input voltage and a second input voltage, said subtractor circuit comprising: a first semiconductor element, a second semiconductor element, a third semiconductor element, a fourth semiconductor element, a fifth semiconductor element, and a sixth semiconductor element configured to each invert a voltage input to an input terminal and output the inverted voltage from an output terminal; an input terminal of said first semiconductor element being connected to a first terminal to which said first input voltage is input; an input terminal of said second semiconductor element being connected to a second terminal to which said second input voltage is input; an output terminal of said first semiconductor element being connected to an input terminal of said third semiconductor element and an output terminal of said fourth semiconductor element; an output terminal of said third semiconductor element being connected to an input terminal of said fifth semiconductor element; the input terminal and an output terminal of said fifth semiconductor element being short-circuited, and the output terminal of said fifth semiconductor element being connected to an output terminal of said second semiconductor element and an input terminal of said sixth semiconductor element; and an output terminal of said sixth semiconductor element being connected to an input terminal of said fourth semiconductor element and a third terminal from which said output voltage is output.