Optical communications – Receiver
Reexamination Certificate
2005-07-07
2008-12-02
Phan, Hanh (Department: 2613)
Optical communications
Receiver
C398S208000, C398S209000, C398S210000, C398S211000, C398S214000, C398S017000, C398S024000, C398S025000, C398S026000, C398S027000, C398S135000, C398S136000, C398S158000, C398S159000, C398S161000, C250S2140AG, C250S2140LA, C250S2140AG, C250S2140RC, C250S338100, C330S059000, C330S308000, C327S100000, C375S317000, C375S318000
Reexamination Certificate
active
07460792
ABSTRACT:
In an optical communication-use receiving circuit of the present invention, the pulse width of the received pulse which is a binary signal corresponding to the signal optical pulse is specified by using an integration circuit and a trigger generating circuit. If the pulse width of the received pulse is not shorter than a predetermined value, a signal having a fixed pulse width is outputted as an output signal from a one-shot pulse generating circuit, so that a pulse having a constant pulse width corresponding to the specified communication speed is outputted. Accordingly, if the pulse width deriving from the signal optical pulse is larger than a certain value, the communication is deemed as a low-speed communication, and a pulse having a constant pulse width corresponding to the communication speed is outputted. As a result, it is possible to realize a small-size receiving circuit and a small-size electronic device which require no external switching-over terminal.
REFERENCES:
patent: 4497068 (1985-01-01), Fischer
patent: 5469287 (1995-11-01), Iwakuni
patent: 6556330 (2003-04-01), Holcombe
patent: 2002/0167706 (2002-11-01), Adamietz et al.
patent: 2005/0087688 (2005-04-01), Yokogawa et al.
patent: 05-175818 (1993-07-01), None
patent: 2000-115078 (2000-04-01), None
Nishino Takeshi
Yokogawa Naruichi
Birch & Stewart Kolasch & Birch, LLP
Phan Hanh
Sharp Kabushiki Kaisha
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