PROGRESS IN VLSI OPTICAL POSITION-SENSITIVE CIRCUITS

This paper describes new techniques to implement 1-D and 2-D mesh-type position-sensitive devices (PSDs) using current-mode analog VLSI (ver y large scale integration). By taking advantage of local analog comput ation, this approach allows sensors to be merged on the same chip with extremely compact circuits that process the incoming signal. The pres ented schemes have advantages over conventional implementations in usi ng general-purpose technology and in their capability to be electronic ally tunable, Three versions of the sensor have been implemented and t ested, showing non-linearity r.m.s. errors ranging from 0.1 to 1.2% de pending on the architecture. (C) 1998 Elsevier Science S.A. All rights reserved.