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首页> 外文期刊>Optical and quantum electronics >Design of a readout circuit incorporating a 12-bit analog-to-digital converter for cooled infrared focal plane array
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Design of a readout circuit incorporating a 12-bit analog-to-digital converter for cooled infrared focal plane array

机译：集成有用于冷却红外焦平面阵列的12位模数转换器的读出电路的设计

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The infrared focal plane array (IRFPA) is gradually becoming more systematic. In order to enhance the signal processing capabilities, analog-to-digital converters (ADC) integrated into the readout integrated circuit (ROIC) is an important development trend. However, the cryogenic effects of MOSFET devices will affect the conversion accuracy of the ADC at 77 K. In this paper, the main parameters of MOSFET are extracted at 77 K in 0.18 mu m CMOS process, and a cryogenic model is established. Based on this, a digital ROIC is designed, which integrates a 12-bit single-slope integral ADC in pixel unit. By applying continuous integral ramp generator and mixed-voltage comparator, a high-linearity and low-power consumption single-slope ADC is realized for the cooled readout circuit. The measured dynamic effective number of bits of the ADC at 77 K is 10.92 bits, the static no-missing code resolution reaches 11.99 bits, the maximum differential nonlinear |DNL| < 1LSB and maximum integral nonlinear |INL| < 1LSB. This paper realizes the design of a digital ROIC for IRFPA and improves the simulation accuracy at 77 K.
机译：红外焦平面阵列（IRFPA）逐渐变得更加系统化。为了增强信号处理能力，集成到读出集成电路（ROIC）中的模数转换器（ADC）是重要的发展趋势。但是，MOSFET器件的低温效应会影响ADC在77 K时的转换精度。本文以0.18μmCMOS工艺在77 K下提取MOSFET的主要参数，并建立了低温模型。基于此，设计了一种数字ROIC，该数字ROIC以像素为单位集成了12位单斜率积分ADC。通过使用连续积分斜坡发生器和混合电压比较器，可为冷却的读出电路实现高线性度和低功耗的单斜率ADC。在77 K时测得的ADC动态有效位数为10.92位，静态无失码分辨率达到11.99位，最大差分非线性| DNL |。 <1LSB和最大积分非线性| INL | <1LSB。本文实现了IRFPA的数字ROIC的设计，并提高了77 K时的仿真精度。

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