Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Charge transfer device
Reexamination Certificate
2006-07-11
2006-07-11
Louie, Wai-Sing (Department: 2814)
Active solid-state devices (e.g., transistors, solid-state diode
Field effect device
Charge transfer device
C257S292000, C257S432000, C257S444000, C257S462000
Reexamination Certificate
active
07075130
ABSTRACT:
A photosensitive device with a photodiode and an amplifier is disclosed. The diode is in series with a feedback transistor which forces the voltage derived from the photocurrent to be a logarithmic function of the light intensity. A current mirror is provided which controls the bias current to the amplifier to be proportional to the photocurrent. This arrangement ensures that the amplifier, just as the voltage derived from the photocurrent, becomes faster with increasing light intensity and therefore prevents an unnecessarily high power consumption at low light intensities.
REFERENCES:
patent: 5376813 (1994-12-01), Delbruck et al.
patent: 6528777 (2003-03-01), Ames et al.
Delbrück Tobias
Lichtsteiner Patrick
Liu Shih-Chii
Zahnd Samual
Cooper & Dunham LLP
Dowden Donald S.
Eidgenossische Technische Hochschule Zurich
Louie Wai-Sing
Universitat Zurich
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