Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-06-21
2005-06-21
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140AG, C330S308000
Reexamination Certificate
active
06909082
ABSTRACT:
An automatic threshold control device for a burst mode optical receiver is disclosed. The receiver includes a converter that converts a burst mode signal into a voltage signal and an automatic gain controller for automatically controlling a gain of the converter, independently generating a reset signal and applying it to the automatic threshold control device. The automatic threshold control device is adapted to detect a voltage level of an output signal from the converter. The device includes a peak detector that detects a peak level of the output signal from the converter in response to the reset signal, a bottom level detector that detects a bottom level of the output signal from the converter in response to the reset signal, a pair of resistors having their one sides connected respectively to the peak detector and bottom level detector and their other sides connected to each other, the resistors generating a reference voltage on the basis of voltages of the peak level and bottom level, and a capacitor for storing the reference voltage.
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patent: 6587004 (2003-07-01), Ide
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Doh Hee-Chan
Ki Hyeon-Cheol
Oh Yun-Je
Park Gil-Yong
Park Tae-Sung
Allen Stephone B.
Cha & Reiter L.L.C.
Lee Patrick J.
Samsung Electronics Co,. Ltd.
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