A 64×64 BDI ROIC For Carbon-Based Short Wave Infrared Image Sensors

This paper proposes a 64*64 multifunctional readout integrated circuit for carbon-based short-wave infrared image sensors. In order to ensure the stability of the bias voltage of the detector and the smaller pixel area, the pixel circuit adopts buffered direct injection (BDI) with a single-stage amplifier as the input stage. The readout integrated circuit (ROIC) can process 100pA to 100nA input current with dark current cancellation branch. The pixel has two selectable conversion gains: low gain (LG), high gain (HG),and full-well-capacity(FWC) respectively 5.27Me-and 380Ke-. At 300K, the read noise is 562e-in LG operation mode and 150e-in HG operation mode. The entire array is powered by 3.3V for both digital and analog, with an output swing of 2V. The multi-function of the readout circuit can be configured through the latch control word, Which supports Integrate-Then-Read (ITR) and Integrate-WhileRead (IWR) two readout modes. The main clock of the array is 20MHz, the readout rate can be configured from 100KHz to 10MHz, and the fastest frame frequency can reach 2KHz. Simulation tests show, the output linearity under different PVTs is greater than 99%, the dynamic range can reach 73dB, and the overall power consumption is less than 15mW.