High-speed CMOS driver for optical sources
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United States of America Patent
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-
Dec 31, 1996
Grant Date -
N/A
app pub date -
Jun 1, 1995
filing date -
Jun 6, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The circuit in CMOS technology allows high speed driving of optical sources, in particular laser diodes, operating efficiently at speeds that meet the requirements imposed by optical fiber communication systems and avoiding interference between driving currents and biasing current in the optical source. The circuit utilizes a bias current generator, a modulation current generator and a cascade of CMOS inverter stages that supplies a driving voltage to the modulation current generator and receives digital signals at its input. It is possible to independently adjust the bias current, so as to allow driving sources with different threshold currents, and to adjust the modulation current.
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