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The Igor Pro manual ships in PDF format with Igor Pro. Wide-Angle Neutron Spin Echo Spectroscopy.Long leads simple exacerbate this problem, especially at high frequencies / sharp transitions, where even a simple wire lead is a source of coupling and inductive ringing. Finally, the breadboard, due to the nature of its construction, introduces capacitance, inductance, and all kinds of parasitic coupling.This will ensure that the peak on the rising edge and trough on the falling edge of the ringing are damped – there will be some effect on the respective trough / peak of the ringing as well because of the excess energy of the peaks being dissipated across the diodes.Simulate this circuit – Schematic created using CircuitLab If you absolutely must avoid overshoot / undershoot beyond a few hundred milliVolts, add small signal Schottky diodes from the output pin to both supply and ground pins, thus:
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Add a load from the output you are reading to the ground pin, as close to the output pin as possible – 220 Ohms should be fine, and again you want leads trimmed to minimum.Those leads are adding inductance you don’t want. Trim the leads of all 3 capacitors above to the bare minimum which will still make positive contact with the breadboard contacts.In parallel with the 0.1 uF decoupling capacitor shown in your schematic, and touching the Schmitt Trigger supply pins, add a 10 uF electrolytic capacitor.
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#Igor pro remove ringing and overshoot generator
This fast-edge pulse generator is purely for my own experimenting/education, so there is nothing critical about it. The remaining triggers are used with 220Ω resistors to create an approximately 50Ω impedance, but I get almost identical results measuring at the output node. I am measuring the output from the first Schmitt trigger (IC1D, at pin 2). In looking for solutions I’ve ran into terms like snubbers and dampening for RF circuits and things beyond my hobbyist pay grade.Īnindo suggests in an answer to a related question that one should use a 50Ω resistor for a load. It is easy to make it worse, by physically touching R1. In particular, the rising edge of the square wave has a substantial amount of overshoot (about 200mV over 500mV peak) and ringing. On the breadboard, it has some obvious unwanted qualities due to jumper length, the breadboard itself, etc. I’ve built a simple RC and Schmitt-trigger-based square wave pulse generator.