| Title |
Analyses of temperature change of a u-bolometer in Focal Plane Array with CTIA bias cancellation circuit |
| DOI |
https://doi.org/10.5370/KIEE.2011.60.12.2311 |
| Keywords |
μ-bolometer ; FPA ; Thermal analyses ; CTIA bias cancellation circuit ; High speed operation |
| Abstract |
In this paper, we study the temperature change of a μ-bolometer focal plane array with a capacitive transimpedance amplifier bias cancellation circuit. Thermal analysis is essential to understand the performance of a μ-bolometer focal plane array, and to improve the temperature stability of a focal plane array characteristics. In this study, the thermal analyses of a μ-bolometer and its two reference detectors are carried out as a function of time. The analyses are done with the 30μm pitch 320×240 focal plane array operating of 60 Hz frame rate and having a columnwise readout. From the results, the temperature increase of a μ-bolometer in FPA by an incident IR is estimated as 0.689°C, while the temperature increase by a pulsed bias as 7.1°C, which is about 10 times larger than by IR. The temperature increase of a reference detector by a train of bias pulses may be increased much higher than that of an active μ-bolometer. The suppression of temperature increase in a reference bolometer can be done by increasing the thermal conductivity of the reference bolometer, in which the selection of thermal conductivity also determines the range of CTIA output voltage. |