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An array of light-intensity sensors based on flip-flops

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1 Author(s)
Lian, W. ; Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands

A RAM-compatible light-intensity sensor array with a digital output, based on flip-flops consisting of silicon phototransistors and implanted resistors, is presented. The sensor is based on bringing a flip-flop into the highly sensitive unstable state, from which it will switch to a `one' or `zero', depending on the perturbation. The sensing elements are incorporated in the flip-flop to generate a perturbation. The advantages of the technique include a digital output, a high sensitivity, and a simple structure. By virtue of their small size, a large number of flip-flop sensors can be integrated in an array. The experimental device contained 64 flip-flops organized in an 8×8 matrix and was used for the measurement of a two-dimensional optical image. Performance and operating characteristics are reported

Published in:

Electron Devices, IEEE Transactions on  (Volume:35 ,  Issue: 12 )