A −20°C~+107°C 52mk-NETD Reference-cell-free 15-bits ROIC for 80×60 Micro-bolometer Thermal Imager

A 52mk NETD reference-cell-free wide-temperature-sensing-range readout IC (ROIC) for micro-bolometer with 15-bits hybrid ADC consisting of the current-mode folding integration (CMFI) and single-slope (SS) operations is realized. The proposed CMFI-SS operation effectively extends conversion range and successfully covers all the circuits PVT variation while provides great temperature sensing range. The prototype achieves a temperature sensing range of −20°C~+107°C while considering the +-15% chip-to-chip and +-3% cell-to-cell pixel variations with an INL/DNL of +-0.12°C/+-0.04°C.