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.

Absolutely need to bookmark this web page

The web page is well educative and on my favorite sites

Thanks very much indeed

Serhat

I love your tutorials. very very good.

(maybe you are a man of persia.)

I am a man of Persia!

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

Best of luck!

Waiting impatiently for the next one

Just one more week! I have been very busy, but will post more videos soon.

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

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.

Thanks, I will do some teardowns in the next few weeks.

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.

Thanks for your comment. More videos are on their way next week!

What about the phase domain?

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

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.

Yup, in simple terms the harmonics are in opposite phases and cancel each other.

i am impressed by your setup, somewhat jealous.

how about a tour of your lab?

can you share one of your current projects?