大规模IR ROIC中列读出级的低功耗设计

Low Power Design of Column Readout Stage for Large Format IR ROIC

本文提出了一种大规模面阵型红外读出电路列读出级的低功耗设计.当读出频率为4MHz时,通过采用输出总线预置技术和stand-by低功耗策略,与主从两级放大的列读出级相比,功耗从8.16mW降低到了0.8mW,节省了大约90%的功耗.在输出总线预置的结构中,ROIC一共有四条输出总线,轮流驱动输出缓冲器进行读出.当一个输出总线被读出时,其他三条总线上的数据则在准备之中.当列选择信号到来时,输出总线上不再有大信号SR过程,而只有小信号的重新建立过程.因此在同等建立时间的条件下,可以减小CSA的带宽和功耗.

A low power consumption design for the column readout architecture of a large snapshot infrared （IR） readout integrated circuit （ROIC） is proposed in this paper. For the readout rate of 4MHz, by using the output bus pre-settling and the stand-by low power donsumption, the power consumption of this design is reduced from 8.16mW to 0.8mW which means it can save about 90% power as compared with the column readout architecture with both master and slave amplification. In the readout stage with a pre-settled output, there are four output buses which are used to drive the output buffer to readout in turn. When the data from one of the output buses are read out, the data in three other output buses are in preparation. When the column selection signal arrives, there are no SR process but only small signal settling process in the output buses. Therefore, for the same establishing time, the bandwidth and power consumption can be reduced by using this design.