Laser driving apparatus with current control circuitry and multi-channel circuitry
Number of patents in Portfolio can not be more than 2000
United States of America
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-
Feb 1, 2022
Grant Date -
Dec 3, 2020
app pub date -
May 28, 2020
filing date -
May 28, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
A laser driving apparatus includes a driver, a tracking circuit, a comparator and a control circuit. The driver includes a laser driving circuit, and the tracking circuit includes a reference current source and a replica circuit. The laser driving circuit generates a driving current to drive a laser. The reference current source generates a reference current as a reference for the laser driving apparatus. The replica circuit corresponds to at least a portion of the laser driving circuit, generates a sensing current according to the reference current and track the driving current. The comparator compares voltages respectively on the laser driving circuit and the replica circuit to generate a comparison signal. The control circuit adjusts the sensing current or the driving current according to the comparison signal. The laser driving apparatus can include multiple channels with multiple drivers.
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