AN IC that combines the advantages of silicon light sensors with the signal processing capability of bipolar integrated transistors will be reported. Included on the all-bipolar chip are a linear light-to-currrnt convrrter, a voltage reference, and an adaptively biased voltage comparator. In accqmplishing this marriagc, circuitry was developed to provide operation at the very low current levels and over a wide dynamic range of the sensor. Besides their normal sensory function, photodiodes were made t o serve …
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