Patent ID: 11971306
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 9:
10. The infrared detecting device according to claim 9, wherein each positive feedback circuit includes a P-type MOS transistor having a gate receiving cathode voltage of the diode of the corresponding infrared sensing portion, and a current mirror circuit receiving a drain current of the P-type MOS transistor and having an output connected to a cathode of the diode,
the infrared detecting device further comprises a driving line to which anodes of the diodes in the plurality of infrared sensing portions are sequentially connected in an arrangement direction of the plurality of infrared sensing portions, a plurality of current sources provided for the positive feedback circuits respectively, a dummy driving line to which the plurality of current sources are sequentially connected in the arrangement direction, and a plurality of differential integration circuits provided for the plurality of infrared sensing portions respectively,
the driving line and the dummy driving line have the same resistance,
current values of the plurality of current sources are set such that a potential distribution of the dummy driving line and a potential distribution of the driving line in the arrangement direction are the same, and
the differential integration circuit outputs a difference between an output voltage of the corresponding current mirror circuit and a voltage of a connection point between the corresponding current source and the dummy driving line.