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Line Injector

This repository contains the schematics and mechanical files for a line injector. A line can be used to inject a ripple voltage into the supply line of a circuit. This can, for example, be used to measure the power supply rejection ratio (PSRR) of a regulator.

Key Features:

  • Bandwidth (-3 dB): 6 Hz - 35 MHz (into 50 Ω)
  • Passband transfer function is about 0.95 V/V (@ 5V) and 0.975 V/V (@ 15V)
  • Maximum input voltage: 50 V
  • Maximum current: 5 A
  • Remote sensing inputs to compensate for the voltage drop over the MOSFET

Line injector pcb

The design was done using KiCAD 6.

Bode Plot

Bode Plot

Additionally, a report from the Bode 100 VNA used to characterize the injector can be found here.

Photos of the finished design

Front

Line injector photo front

Back

Line injector photo back

PCB

Line injector photo back

About

The root folder contains the KiCAD files, while the gerber files can be found in the /gerber folder, the bill of materials in the /bom folder.

Related Repositories

See the following repositories for more information

KiCAD footprints: https://github.com/PatrickBaus/footprints.pretty

KiCAD 3D models: https://github.com/PatrickBaus/footprints.3dshapes

KiCAD schematic libraries: https://github.com/PatrickBaus/KiCad-libraries

License

This work is released under the Cern OHL v.1.2 See www.ohwr.org/licenses/cern-ohl/v1.2 or the included LICENSE file for more information.

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A line injector for PSRR measurements

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