ABSTRACT
This chapter describes important design considerations and the experimental results obtained from the implementation. The implementation also proved the suitability of the design for technological applications. A figure of merit that helps put the accuracy of the implementation in relative perspective is found by noting that the 1.89% average error can be treated as quantization error of a corresponding digital system. The range compression property has immediate technological applicability; presently available pho-todetector imaging technologies such as charge coupled devices arrays cannot compare with the sensitivity range of the biological systems without the attendant degradation caused by blooming, ghosting, or minimum charge transfer sensitivity. The amount of level-shifting is a function of the turn-on voltage of the diode which can be increased, up to the negative supply rail voltage, by adding more diodes in series, or custom designing diodes with required turn-on voltages during integrated circuit design.
