Design of a Constant Current Laser Driver for Biomedical Applications

Temel O. D., Ferhanoğlu O., Yelten M. B.

12th IEEE Latin America Symposium on Circuits and System (LASCAS), ELECTR NETWORK, 22 - 25 February 2021 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/lascas51355.2021.9459114
  • Country: ELECTR NETWORK
  • Keywords: laser driver, reference current, biomedical, capsule endoscopy
  • Istanbul Technical University Affiliated: Yes

Abstract

In this paper, an integrated constant current laser driver has been designed for biomedical engineering applications, along with an extra reference generator for nearby circuit blocks in the system using the same circuit core. The designed laser driver achieves a continuous wave operation for a vertical-cavity surface-emitting laser (VCSEL) by supplying a current of 12 mA. The reference current source provides a current of 95 mu A. The total power consumption of both circuits is 49.4 mW. Monte Carlo analysis has been performed and the operation of both current references have been ensured despite a 3 sigma process parameter variation.