Simulation and implementation of a two-mode-operation transconductance regulator with a Gallium Nitride High-Electron-Mobility Transistor

Kai Jun Pai*, Chang Hua Lin

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

Abstract

A GaN high-electron-mobility transistor (HEMT) with a wide-bandwidth operational amplifier was employed to implement and develop a two-mode-operation transconductance regulator (TMOTR). Using the proposed TMOTR, the laser diode can be operated in either the continuous constant-current mode to fulfill a continuous-wave laser or pulse-width modulation (PWM) to achieve a narrow-pulsed laser. When the laser diode is operated in PWM mode and at high frequency, the parasitic elements of the GaN HEMT, laser diodes, printed circuit board, and power wires must be considered, because these parasitic elements can influence the rising-edge slope of the laser diode driving current resulting in narrow-pulsed duty cycle diminution. This study applied equivalent circuit models of a GaN HEMT and laser diode to determine the parasitic parameters in accordance with device packages; therefore, the simulation circuit of the TMOTR with its parasitic element could be implemented to obtain the critical simulation waveform. The parasitic element parameters of the laser diode and GaN HEMT were calculated in detail and used simulation software to verify the TMOTR's characteristics. Finally, the TMOTR prototype was implemented, and the experimental waveforms were measured to confirm simulations, equivalent circuits, and dynamic responses; the GaN HEMT and MOSFET were experimented to compare their differences.

Original languageEnglish
JournalInternational Journal of Circuit Theory and Applications
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • continuous-wave
  • GaN HEMT
  • laser diode
  • transconductance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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