In this study,we designed an infrared focal plane array(IRFPA)digital readout integrated circuit(ROIC)for medium/long-wave(MW/LW)dual-color applications.Owing to the variation in the magnitude of the injection current,dynamic output impedance of dual-color IRFPA devices,and the high sensitivity required for both bands,the structural design of two input stages and a large dynamic range must be achieved within the limited pixel area of the ROIC.Therefore,the proposed circuit adopted a pulse frequency modulation(PFM)structure based on a direct injection(DI)type input stage and a charge reset unit to replace the traditional voltage reset structure,reducing the detectable charge resolution and improved the nonlinear effect caused by the reset lost charge.We designed a 20-bit hybrid structure counter to satisfy the large-charge capacity and low-power consumption requirements of the circuit.Simulation results demonstrated that the minimum charge resolution was 692 e,corresponding to a charge capacity of 0.72 Ge.The dual-band detection linearity exceeded 99.8％,and the power consumption was 3.03/6.66 μW in typical MW/LW applications.
MW/LW IRFPA ROICPFMcharge reset unit20 bit counter
NETL
NSTL
万方数据
