High Stability Low Noise Laser Current Driver PCB

Document #:

LIGO-D1200719-v7

Document type:

D - Drawings

Abstract:

A printed circuit board and associated schematic for a low noise laboratory quality current source to be used with commercial laser diodes in critical applications

Files in Document:

• PDF of Schematic, BOM and Layout (Laser Diode Driver v7.pdf, file is not accessible)

Other Files:

• Altium Project Files (Zipped) (Laser Diode Driver v7.zip, file is not accessible)
• Bill of Materials in Excel Format (Laser Diode Driver v7.xlsx, file is not accessible)
• ODB++ Files (Laser Diode DriverODB_v7.zip, file is not accessible)
• Pick and Place Files in CSV Format (Pick Place for Laser Diode Driver v7.csv, file is not accessible)
• Zipped gerber files for manufacture (Laser Diode DriverGBR_v7.zip, file is not accessible)

ICS/JIRA Record:

• ICS_LINK

Topics:

• Basic R&D

Authors:

• Rich Abbott

Keywords:

current source laser driver

Notes and Changes:

This revision makes the following modifications:
1. Added a protection circuit that limits the output voltage of the driver to the laser diode to 4 V.
2. Changed U9 to LT1128, which lowers the sensing noise for the current set point of the slow path.
3. Changes the topology of the slow bias path to use only a single power N-channel MOSFET for the bias current. This was to prevent the observed bias-dependent cross-ver between the two feedback routes in the slow path, which caused a noise bump at the cross-over frequency.

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