A new readout integrated circuit for long-wavelength IR FPA

In the present paper, design of a readout integrated circuit (ROIC) for hybrid matrix IR FPA is presented. The design solution involves a ROIC matrix formed by 2 × 2-element fragments (cells) in which all the four cell elements, connected to one common read line, share a common integrating capacity. It is shown that, with the proposed ROIC structure: (i) the ROIC charge capacitance can be increased by a factor of 6–10, thus enabling two–three-fold enhanced NETD value of hybrid far-IR FPAs; (ii) the total number of read lines in IR FPAs can be decreased twice compared to traditional IR FPA designs, thus facilitating, due to doubly increased line spacing, the design of photosignal preprocessing system integrated with ROIC; (iii) improved structural arrangement of adaptive photosignal preprocessing system can be proposed.