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As a continuation of our digital radiographic sensor R&D, we have developed a digital gamma-imaging system based upon the commercially-available CdTe-CMOS sensor (AJAT, SCAN1000) and the 75Se gamma source (MDS, Gamma Mat@ SE) for our ongoing application of nondestructive testing. Here the sensor has a 750-mum-thick CdTe photoconductor as an efficient radiation converter and a CMOS pixel array...
A 2- mu m CMOS IC interfaces directly to the output of a CCD, level shifts the signal, amplifies it by a 4-bit programmable gain of up to 20 dB, and corrects the offset per pixel with a 3-bit word. A non-reset video output is obtained with an internal time-interleaved architecture. The total harmonic distortion (THD) of -50 dB is obtained at 15 MHz clock rates and +or-3.3 V full scale outputs. The...
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