A test board with 50 Ω driver circuits for digital signals

Published: 23-02-2021| Version 1 | DOI: 10.17632/zj4fxws38x.1
Tilman Küpper


As part of a larger electronics project, different 50 Ω driver circuits for digital signals are built, compared and evaluated. In this article, a fully assembled test board and all measurement results are presented. Does it make a difference if a solderless breadboard is used instead of a printed circuit board with solid ground plane? This question is answered as well. However, the test board is not only useful for developing driver circuits, but can also be used directly as a simple pulse generator. After all, some of the driver circuits presented here show faster rise and fall times than many commercial function generators. Design Files: - testboard.zip: KiCAD files with schematic and PCB layout - firmware.zip: ATtiny2313 firmware, all driver circuits are tested (Atmel Studio 7) - oscope.zip: Oscilloscope measurements of all driver circuits, with and without load resistor - simul3.zip: LTspice simulation of the discrete push-pull circuit