On-chip light sensor

Details On-chip light sensor On-chip light sensor

1995-01-26

1996-01-02

Wong, Peter S.

Radiant energy

Photocells; circuits and apparatus

Signal isolator

250214R, G02B 2700

Patent

active

054811180

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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