One of Noqsi's current projects is the development of new compact measurement chains for X-ray imaging with CCDs. Conventional Delta Sigma digitizers generally have excellent linearity, precision and noise rejection. They are especially well suited for implementation as integrated circuits. However, conventional Delta Sigma digitizers are rarely used for time-bounded signals like CCD pixels. We are developing a CCD video digitizer chip incorporating a novel variant of the Delta Sigma architecture that is especially well suited for this application. This architecture allows us to incorporate video filtering and correlated double sampling into the digitizer itself, eliminating the complex analog video processing usually needed before digitization.
In the manuscript entitled An ASIC for Delta Sigma Digitization of Technical CCD Video, we present details of a multichannel ASIC design that will achieve spectroscopic precision and linearity while using much less energy than previous CCD digitizers for technical applications such as imaging X-ray spectroscopy.
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