Compensation circuit for compensating non-uniformity according to change of operating temperature of bolometer
US7335884B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 2006 |
| Grant date | Feb 26, 2008 |
| Priority date | — |
| Expiry date | May 13, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/77
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a bolometer, and more specifically to a compensation circuit for compensating non-uniformity due to the difference of operating temperature between bolometers which exist in bolometer array using semiconductor material. A compensation circuit according to the present invention comprises a biasing part including a first transistor generating bias current according to the change of operating temperature to have a dependency of exponential function for the operating temperature of circuit, and a second transistor turned on/off according to the column signal of a bolometer array; a bolometer part including a variable resistor for detecting IR in a pixel base, a third transistor turned on/off according to the column signal of a bolometer array coupled to one end of the variable resistor, and a fourth transistor turned on/off according to the row signal of a bolometer array coupled to the other end of the variable resistor; and an off-set compensation part for compensating the non-uniformity of the bolometer unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.