Tutorial on Linear and Non-linear Circuits


In this episode Shahriar investigates the impact of linearity and distortion on analog circuits. The source of a non-linear input/output characteristic is presented in three different domains: mathematical, time domain and frequency domain. After the theoretical discussion, a sample circuit is built and tested to illustrate real time signal distortion. The criteria for measuring non-linearity is also presented. Furthermore, the importance of a two-tone test for bandwidth limited circuits is shown theoretically and experimentally. There is another quiz in this episode! Please discuss the answer on the forum or in the comment section.



  1. Serhat says:

    Absolutely need to bookmark this web page
    The web page is well educative and on my favorite sites

    Thanks very much indeed


  2. Hamzeh says:

    I love your tutorials. very very good.
    (maybe you are a man of persia.)

  3. Viesturs says:

    Terrific tutorials, thanks for doing it! I hope that even now you might resume making these things!

    Best of luck!

  4. Sylvain says:

    Waiting impatiently for the next one 🙂

  5. adam says:

    In the first test, is the diode reversed compared to the schematic? If its set up like in the schematic, (diode pointing to ground) wouldn’t that clip the positive side of the wave? Some of these concepts are a bit beyond me, but I would like to understand. thanks

  6. Andrew says:

    Another great video. Looking forward to the next video – I’d be interested in a teardown of any instrument except the power supply. Also, like sqkybeaver suggested, I’d be interested in learning about one of your current projects.

  7. nathan says:

    For the quiz – when you connect the second diode it clamps the top and bottom of the wave, which makes the signal half-wave symmetric, meaning that f(t+T/2)=-f(t)
    The even harmonics of the fourier series of a half-wave symmetric signal always vanish, because of that symmetry.

    Really enjoying the videos! It would be cool to see something about how real-world effects like noise and component value variance render some circuits useless, even though those circuits work well in simulators or when analysed by hand.

  8. John Tarbox says:

    What about the phase domain?

  9. soasystem says:

    a very quality content video. keep vblogging and i wish you success.

  10. pete says:

    Another great video! Really appreciate the time and effort you put into these.

    As for the quiz, I’ve got no formal training but I notice the second diode connected to ground in the opposite way as the first, perhaps canceling each others every other harmonic.

  11. sqkybeaver says:

    i am impressed by your setup, somewhat jealous.

    how about a tour of your lab?

    can you share one of your current projects?

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