Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1996-08-05
1997-10-21
Glick, Edward J.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2502521, G01J 506
Patent
active
056799535
ABSTRACT:
An automatic and adaptive threshold setting circuit for an IR receiver is capable of operating over a broad range of frequencies and power levels. The adaptive threshold circuit allows a very sensitive threshold in environments where little sunlight or other ambient light reaches the receiver, but which will increase the threshold of the receiver when large amounts of ambient light fall on the photo diode. The circuit senses the current flowing through the reverse biased IR photo detector due to ambient light levels. This current measurement is used to adjust the sensitivity of the receiver.
REFERENCES:
patent: 3787668 (1974-01-01), Currie et al.
patent: 4426662 (1984-01-01), Skerlos et al.
patent: 4933563 (1990-06-01), Thus
Ananth Ravi Shanker
Gowda Sudhir Muniswamy
Milshtein Mark Samson
Ritter Mark B.
Rogers Dennis Lee
Glick Edward J.
International Business Machines - Corporation
Tassinari, Jr. Robert P.
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