ASK optical transmitter
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United States of America Patent
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-
Sep 27, 1994
Grant Date -
N/A
app pub date -
Mar 25, 1993
filing date -
Mar 25, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An amplitude-shift-keyed (ASK) optical transmitter is described for generating an ASK modulated infrared signal from a light-emitting-diode (LED). The transmitter includes a DC powered microcircuit for generating an ASK modulation signal. A pair of mosfet devices are connected in series with one or more LED's between the mosfets. An oscillator signal used to operate the microcircuit is also employed as a carrier signal to activate one mosfet while the ASK modulating signal is coupled to operate the other mosfet. Input capacitances of the mosfets are used to tune the oscillator signal and smooth the leading and trailing edges of the ASK modulation signal. Several embodiments are described.
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