Receiving circuit and electronic apparatus for optical communication
First Claim
1. A receiving circuit, for use in an optical communication, from which an output signal is outputted in accordance with a signal optical pulse incident to a light-receiving element, the receiving circuit comprising:
- a variable output circuit for (I) detecting a pulse width of the signal optical pulse, (II) determining a pulse width of the output signal in accordance with the pulse width of the signal optical pulse, and (III) outputting the output signal.
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Accused Products
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.
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Citations
14 Claims
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1. A receiving circuit, for use in an optical communication, from which an output signal is outputted in accordance with a signal optical pulse incident to a light-receiving element,
the receiving circuit comprising: a variable output circuit for (I) detecting a pulse width of the signal optical pulse, (II) determining a pulse width of the output signal in accordance with the pulse width of the signal optical pulse, and (III) outputting the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic device comprising a receiving circuit for use in an optical communication,
the receiving circuit being for outputting an output signal is outputted in accordance with a signal optical pulse incident to a light-receiving element, the receiving circuit including: a variable output circuit for (A) detecting a pulse width of the signal optical pulse, (B) determining a pulse width of the output signal in accordance with the pulse width of the signal optical pulse, and (C) outputting the output signal.
Specification