Patent ID: 7782042

Claim:
A reference voltage supply circuit comprising: a first supply circuit that includes a reference-voltage first-type operational amplifier and supplies an analog reference voltage to a first analog reference voltage line; and a second supply circuit that includes a reference-voltage second-type operational amplifier and supplies the analog reference voltage to a second analog reference voltage line; when a channel width and a channel length of a differential-stage transistor of a differential section of the reference-voltage first-type operational amplifier are respectively referred to as W 1 a and L 1 a , a bias current flowing through the differential section of the reference-voltage first-type operational amplifier is referred to as Ia, a channel width and a channel length of a differential-stage transistor of a differential section of the reference-voltage second-type operational amplifier are respectively referred to as W 1 b and L 1 b , and a bias current flowing through the differential section of the reference-voltage second-type operational amplifier is referred to as Ib, W 1 b ×L 1 b >W 1 a ×L 1 a and Ia>Ib being satisfied.