Pulsed Laser Diode Circuit Design

Thought for 1 min 7 sec

The Flux library has a suitable GaN driver, but I didn’t find a small discrete GaN FET part entry; I’ll use a clearly-labeled placeholder switch in the schematic so the topology is complete, and flag it for replacement with the exact EPC/Infineon/TI GaN FET once you choose the MPN.

Thought for 2 mins 8 sec

flux

Components are added, including SMU and 5 V supply connectors; I’m wiring the laser path, dummy path, complementary gates, and local bypassing now.

Worked for 4 mins 23 sec

flux

Created the dual current-steering schematic in the project and renamed it GaN Laser Pulse Driver. The schematic includes the SMU current input, laser branch, dummy branch, sense resistors, SMA pulse input, STDRIVEG600 gate driver, 5 V driver input, decoupling, and ERC review was clean after fixing U1:PVCC.

Open items:

Q1 and Q2 are clearly labeled placeholders because the Flux library did not contain a suitable small discrete GaN FET.
Exact GaN FET MPN and final driver pin usage still need datasheet confirmation before layout.
Your account has no available ACUs, so I cannot continue with more tool-based edits right now.

Created project files:

Find GaN FETs

Verify driver pins

Run ERC/DRC

Update design notes

Q2 S_3 - RS2 P1

Q1 S_3 - RS1 P1

RS2

Resistance

1 ohms

GND

RS1

Resistance

1 ohms

Reviews

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Project Name

GaN Laser Pulse Driver

Description

Dual GaN current-steering pulsed laser diode driver using a PXIe SMU as a continuous 100 mA current source, targeting >=10 ns pulse width and <10 ns edges.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$6.80–$9.39
Digi-Key	$4.31
LCSC	$14.83
Mouser	$12.45
Verical	$4.37–$11.72

Controls

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shapicbee / GaN Laser Pulse Driver

Schematic