We have developed a Si–CMOS terahertz image sensor toaddress the paucity of low-cost terahertz detectors. Our imaging pixeldirectly connects to a VCO-based ADC and achieves pixel parallel ADCarchitecture for high-speed global shutter THz imaging. In this paper, wepropose a digital calibration technique for offset and gain variation of eachpixel using global shutter operation. The calibration technique givesreference signal to all pixels simultaneously and takes reference frames asa part of the high-speed image captures. Using this technique, we achieveoffset/non-linear gain variation suppression of 85.7 compared to withoutcorrection.
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