Patent ID: 7663088

Claim:
A semiconductor device comprising: a plurality of readout circuits each including: a bias circuit that supplies a bias voltage to a bolometer device; a bias cancellation circuit that removes an offset current of said bolometer device; and an integrator that has an input end connected to a connection node of said bias circuit and said bias cancellation circuit; said bias circuit including: an operational amplifier, configured as a follower, and that receives a voltage on a first input voltage line as an input and outputs a voltage which follows the input voltage; and a bias transistor that receives the output voltage of said operational amplifier and supplies a bias voltage to one end of said bolometer device; said bias cancellation circuit including: a follower transistor that receives a voltage on a second input voltage line as input and outputs a voltage which follows said input voltage, said follower transistor forms a source follower circuit; and a canceller transistor that receives an output voltage of said follower transistor and that has a gate connected to an output of said source follower circuit; an output of said canceller transistor and an output of said bias transistor being coupled to said input end of said integrator.