Time Delay Integration Based MOS Photoelectric Pixel Sensing Circuit

摘要

A time delay integration (TDI) based MOS photoelectric pixel sensing circuit (TDIPSC) is proposed. The TDIPSC includes multi-element photoelectric pixel sensor (MEPS) having sub-pixel sensor elements SPSE₁, . . . , SPSE_M respectively converting a portion of pixel light into sub-pixel photoelectric signals (SPPES₁, . . . , SPPES_M). The TDIPSC also includes intermediate photoelectric signal accumulators (PESA₁, . . . , PESA_M) where any PESA_k can be switchably coupled to any SPSE_j via switching transistors for receiving a corresponding SPPES_j from it and accruing an accumulated photoelectric signal ACPES_k. A readout circuit (ROC) switchably coupled to any PESA_k serves to remove and read the ACPES_k. A TDI-sequence controller (TDISC) coupled to the SPSEs, the PESAs and the ROC executes a time sequence of cyclic coupling among them. The TDISC produces, via the ROC, a final time signal SQTS equal to the time delayed summation of the (SPPES₁, . . . , SPPES_M) with a reduced SNR.