Circuit arrangement for evaluating the output of a photodiode unit
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United States of America Patent
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Apr 3, 1990
Grant Date -
N/A
app pub date -
Jan 26, 1989
filing date -
Jan 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The intensity of the optical radiation varies within a wide range. The proportion of parasitic radiation registered by the photodiodes (D1 to Dn) increases with increasing radiation intensity. To exclude this parasitic radiation from evaluation, the photodiodes (D1 to Dn) are followed by analog comparators (K1 to Kn) with a variable reference voltage (Uref1). The reference voltage (Uref1) is varied by an analog comparator (Kz1) in porportion to the radiation intensity determined by a central photodiode (Dz).
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