Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-05-10
2005-05-10
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C257S292000, C348S301000, C348S308000
Reexamination Certificate
active
06891144
ABSTRACT:
Photo-sensitive element for electro-optical sensors realised with the CMOS technology, comprising a photo-sensitive reception member (11, 31) consisting of a diode connected to a conversion circuit to convert the current generated by the photo-sensitive reception member (11, 31) into a tension signal, and an amplification and reading circuit (20, 40). The circuit comprises two transistors (21, 22; 41, 42), arranged in a diode configuration with the drain short-circuited with its own gate, the two transistors (21, 22; 41, 42) being connected in series there between and able to perform a logarithmic conversion of the current, photo-generated by the reception member (11, 31), in continuous time and without requiring time to integrate the light. The photo-sensitive element further comprises a third transistor (23, 43) having its gate connected to a photo-sensitive node (25, 45) at an output of the photo-diode (11, 31) to achieve a first stage of amplification in current of the signal by transferring the tension present on the node (25, 45) to the drain of a fourth transistor (24, 44).
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Sartori Alvise
Tecchiolli Giampietro
Neuricam SpA
Pyo Kevin
Stevens Davis Miller & Mosher LLP
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