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

Claim 0:
1. An infrared detecting device comprising:
a substrate;
a diode provided on the substrate and thermally insulated from the substrate; and
a positive feedback circuit providing a positive feedback loop so that when a current of the diode decreases due to a change in temperature of the diode, the positive feedback circuit further decreases the current of the diode, and when the current of the diode increases, the positive feedback circuit further increases the current of the diode,
wherein the positive feedback circuit includes a P-type MOS transistor having a gate receiving cathode voltage of the diode and a source connected to a power source, 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, and a cathode of the diode and the gate of the P-type MOS transistor are connected to an output of the infrared detecting device, or
wherein the positive feedback circuit includes an N-type MOS transistor having a gate receiving anode voltage of the diode and a source that is grounded, and a current mirror circuit receiving a drain current of the N-type MOS transistor and having an output connected to an anode of the diode, and an anode of the diode and the gate of the N-type MOS transistor are connected to an output of the infrared detecting device.