Low noise readout circuit for infrared focal plane array:in integration while read

InGaAs shortwave infrared focal plane array(FPA) has important application in space remote sensing.In this paper,a new design of readout integrated circuit(ROIC) is presented for a low-noise InGaAs FPA.In order to promote the signal-to-noise ratio,a new correlated double sampling(CDS) circuit is presented for eliminating KTC noise of integration capacitor(0.15 pF) in mode of integration while read.The circuit has been fabricated with 0.5 μm 5 V N-well CMOS process.Test results show that ROIC noise is 1.7×10-4 V and dynamic range is above 80 dB,working well after interfaced with InGaAs detectors.