In this paper, we studied the readout circuit for high sensitivity 1×64 InGaAs/GaAs/AlAs quantum dot-in-well
photodetector array based on wide dynamic range. The improved design capacitor feedback trans-impedance amplifier
(CTIA) is researched as a low-noise adaptive gain control (AGC) CTIA readout circuit. The dynamic range and
sensitivity of the circuit was greatly increased. Two switches K1 and K2 were used to controlling two capacitors 5pF and
9pF, respectively. Then four integration capacitors (1pF, 6pF, 10pF and 15pF) were obtained. The dynamic range of the
circuit was increased 23.5dB. The readout circuit was designed in with the area of 3.6mm×2.9mm in 0.35um CMOS
technology.
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