公开(公告)号：US20190386460A1

公开(公告)日：2019-12-19

申请号：US16219754

申请日：2018-12-13

Applicant: Analog Devices, Inc.

Inventor： Erik D. BARNES ,  Lawrence A. SINGER ,  Harvey WEINBERG

IPC: H01S5/042 ,  H01S3/10 ,  H01S5/026 ,  H01S5/06 ,  H01S5/068

Abstract: Optical systems can emit train(s) of light pulses onto objects to derive a distance between the light source and the object. Achieving meter or centimeter resolution may require very short light pulses. It is not trivial to design a circuit that can generate narrow current pulses for driving a diode that emits the light pulses. An improved driver circuit has a pre-charge path comprising one or more inductive elements and a fire path comprising the diode. Switches in the driver circuit are controlled with predefined states during different intervals to pre-charge current in the one or more inductive elements prior to flowing current through the fire path to pulse the diode.