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In this article we will take a closer look at two of the critical instrument components designed for the JWST: the near infrared detectors and their associated control application-specified integrated circuits (ASICs). These devices have been designed to perform precision analog to digital (A/D) conversion and data transmission in the very harsh environment of deep space. We will first present an overview of the technology used in image sensors for astronomy, followed by a description of the processors used to control them and process the signal. We will then explain how this technology is applied to process the imaging data in the HST and the JWST.