A snap-shot mode cryogenic readout circuit for QWIP IR FPAs

The design and measurement of a snap-shot mode cryogenic readout circuit（ROIC） for GaAs/AlGaAs QWIP FPAs was reported.CTIA input circuits with pixei level built-in electronic injection transistors were proposed to test the chip before assembly with a detector array.Design optimization techniques for cryogenic and low power are analyzed.An experimental ROIC chip of a 128×128 array was fabricated in 0.35μm CMOS technology.Measurements showed that the ROIC could operate at 77 K with low power dissipation of 35 mW.The chip has a pixel charge capacity of 2.57×10;electrons and transimpedance of 1.4×10;Ω.Measurements showed that the transimpedance non-uniformity was less than 5%with a 10 MHz readout speed and a 3.3 V supply voltage.