Patent ID: 7619474

Claim:
An analog circuit comprising: a first circuit including a first-type operational amplifier of which a frequency of an amplification target signal is a first frequency; and a second circuit including a second-type operational amplifier of which a frequency of an amplification target signal is a second frequency lower than the first frequency; when a channel width and a channel length of a differential-stage transistor of a differential section of the 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 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 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 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.