| 摘要 |
PROBLEM TO BE SOLVED: To prevent a gate voltage of an integration transistor of a bias circuit from excessively increasing in a read circuit using the integrated circuit to detect current. SOLUTION: The read circuit 10 includes: an integration sample hold circuit 23 whose input is connected to an integration node N<SB>INT</SB>; and a bias circuit 21 connected between a connection node N<SB>BOUT</SB>to which a thermoelectric conversion element 2 is connected and the integration node N<SB>IHT</SB>. The bias circuit 21 includes: an integration transistor 31 whose source and drain are connected to the connection node N<SB>BOUT</SB>and the integration node N<SB>INT</SB>, respectively; an operational amplifier 32 whose output is connected to a gate of the integration transistor 31, to whose first input a bias voltage is supplied and whose second input is connected to the source of the integration transistor 31; and a diode element 35 connected between the gate and the source of the integration transistor 31. The diode element 35 clips a gate-source voltage of the integration transistor 31. COPYRIGHT: (C)2009,JPO&INPIT
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