Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2007-07-12
2010-02-16
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S208100
Reexamination Certificate
active
07663088
ABSTRACT:
Disclosed is a bolometer infrared imaging device including a plural number of readout circuits, each comprising a bias circuit that includes a bias transistor that supplies a constant voltage to a bolometer device, a bias cancellation circuit that includes a canceller transistor that removes offset current component of the bolometer device and an integrating operational amplifier that integrates the difference current between the current flowing in the bias transistor and that flowing in the canceller transistor. The bias circuit includes a source follower circuit that receives a first input voltage and supplies an output voltage to the gate of the bias transistor. The bias cancellation circuit includes a source follower circuit that receives a second input voltage and supplies an output voltage to the gate of the canceller transistor.
REFERENCES:
patent: 5952659 (1999-09-01), Yoneyama et al.
patent: 5955726 (1999-09-01), Takashima et al.
patent: 2003/0230733 (2003-12-01), Tanaka
patent: 2006/0231760 (2006-10-01), Lee et al.
patent: 2003-318712 (2003-11-01), None
patent: 2004-020325 (2004-01-01), None
Bui-Pho Pascal M
Foley & Lardner LLP
Le Que T
NEC Electronics Corporation
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