Patent ID: 7999780

Claim:
An amplifier circuit comprising: an amplifier having first and second input nodes and one output node; and a feedback circuit including at least a first element and a second element and first, second, third, and fourth switches, wherein: one end of said first and second elements is connected directly with said first input node, the other end of said first element is connected with one end of said first and second switches, the other end of said second element is connected with one end of said third and fourth switches, the other end of said first and third switches is connected with said output node when said first and third switches are on, the other end of said second and fourth switches is connected with a first wiring when said second and fourth switches are on, said second and third switches are off when said first and fourth switches are turned on in a first drive mode, said first and fourth switches are off when said second and third switch are turned on in a second drive mode, and said first drive mode and said second drive mode are periodically switched.