An image decoding ASIC for space-based applications

Abstract

The multi-anode microchannel array (MAMA) is a photon counting detector with primarily astronomical applications which decodes the position of an event through coincidence discrimination. The decoding algorithm which associates a given event with the appropriate pixel is determined by the geometry of the anode array. A space-based realization of the MAMA detector requires that the decoding circuit be an application specific integrated circuit because of power, size and weight constraints. A 1.5 micron CMOS gate array version of the decoder has been fabricated and tested. The chip's development and characteristics are presented, and the ASIC decoder is contrasted with existing discrete component decoders in terms of size, speed, power, reliability, and operational flexibility. A new algorithm incorporated into the ASIC decoder which doubles the pixel spatial resolution is also described.<>