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Updated: Jul 1, 2025

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
Published on: March 20, 2015
Laser diode driver on a programmable system on a chip
Abstract:
A comprehensive solution of a laser diode (LD) driver with temperature control using a programmable system on a chip is proposed as an alternative to dedicated devices. A digital proportional integral differential controller is used for regulating the LD temperature. The light-current characteristics and frequency response of the LD are measured using an external photodiode and interrogated by an integrated transimpedance amplifier. The 0.084% stability, 2 kHz bandwidth, and 0.11% full scale current error are demonstrated. The LD overshoot protection is digitally implemented, providing a soft start. While the circuit is initially optimized for a 3 W infrared LD, instructions are provided for fine-tuning the design according to specific LD requirements.
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