On-chip light sensor
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United States of America Patent
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Jan 2, 1996
Issued Date -
N/A
app pub date -
Jan 26, 1995
filing date -
Jan 8, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A brightness sensing circuit for providing a binary electrical signal for indicating whether incident light exceeds a certain brightness. The circuit's light detector is a photodiode, whose output is amplified by a first current mirror. The circuit has a reference current source, whose output is amplified by a second current mirror. Both currents are delivered to a common node, whose voltage level transitions from low to high when the amplified input current exceeds the amplified reference current. This node is connected to the gate input of a CMOS inverter, which provides a binary output.
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