A TDI charge-coupled imaging device for page scanning

An experimental 2048×32-stage time-delay and integration (TDI) charge-coupled imaging device has been designed, fabricated, and operated. It is designed for high-speed, low-noise, full-page document imaging with moderate illumination. An overview is presented of its design and performance, detailing unusual design features. These include a photocharge capacity of 3.5 million electrons per pel, a parallel-to-serial interface design that avoids a common charge-transfer bottleneck, and a fast large-signal output stage. A discussion is included of the merits of TDI in document imaging applications.