ADJUSTABLE IMPEDANCE LASER DRIVER
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United States of America Patent
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-
N/A
Issued Date -
Apr 23, 2015
app pub date -
Mar 7, 2014
filing date -
Mar 13, 2013
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
An assembly that includes a laser diode and a driver circuit that operates to give the assembly an adjustable impedance. The driver circuit adjusts impedance by repeatedly alternating between two operational phases. In one operational phase, current is primarily or fully supplied through the laser diode using a first current path being from the first supply node, to the laser diode, and into the second supply node. In the other operational phase, current is supplied through the laser diode using a recirculating second current path. The current through the laser diode increases during the first operational phase, and decays during the second operational phase. For a given applied voltage level between the first and second supply nodes, the duty cycle of the first and second operational phases may be adjusted so that the current through the laser diode is approximately a target current.
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