Frequency domain simulation issue with phase response

I tried to explore the changes to the frequency response of simple passive RC low pass filters when a second and third cascaded filter section is added.

Unexpectedly, the phase response of the 3rd order filter shows a "jump" in the output.

Why is this?

NB: Please ignore the OpAmp in the circuit.

by Dan.Ka
November 11, 2020

Perfectly normal. When the phase becomes far enough lagging it is leading

by Foxx
November 11, 2020

So you are saying it's just the presentation style of CL's graphing engine. Fair enough.

I prefer, however, the graphing engine to draw phases below - 180° in the negative axis region, as for example here:

by Dan.Ka
November 11, 2020

Yes it's CL's presentation. I have no problem with it once I figured it out

by Foxx
November 12, 2020
Add comment...

Please sign in or create an account to comment.

No Answers

No answers yet. Contribute your answer below!

Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account

Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers

Ask a Question

Anyone can ask a question.

Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.

About This Site

CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.

We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.

Acceptable Questions:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.