Laser Driver Module

摘要

In known laser driver modules, laser driver circuitry may be controlled using Pulse-Width-Modulation (PWM) or Pulse-Frequency-Modulation (PFM) of a drive current to achieve a desired average power from an emitter array. However, certain applications such as Light Detection and Ranging (LiDAR) applications, may define specific requirements for operation of the emitter array which require a drive signal to have a fixed pulse width. For example, in a LiDAR system a pulse width may typically be fixed at between 1ns and 20ns. Therefore, LiDAR systems may not be not suited to PWM control of a current for driving the lasers. This disclosure describes a laser driver wherein a pulsed signal of relatively constant timing characteristics is used to provide a drive current to one or more lasers from a drive transistor, and wherein a temperature compensated circuit is used to regulate a drive voltage level of the drive transistor.