Transistor amplifier configurations (2-Transistors)

Learn to identify common emitter, common collector, and common base bipolar transistor amplifier configurations. Which is inverting and which is non-inverting? Let's work some examples together. We'll also learn to identify common drain, common source, and common gate MOSFET configurations.
Aaron Danner is a professor in the Department of Electrical and Computer Engineering at the National University of Singapore.
danner.group
Video filmed and edited by Cheryl Lim.
@randomcheryl

[@MrHeatification]

Splendid really answering the questions others dont

[@WPF465B]

Finally, the best explanation transistor amplifier types, thanks.

[@peterbulanyi1708]

Terrific video and an excellent channel. Highly recommended.

[@tiagomello]

Fantastic explanation. Thank you for sharing this.

[@hardrocklobsterroll395]

Can’t wait for this. Always love your uploads. A quick favorite channel

[@waelgomaa7347]

Excellent presentation.

[@garykytola8360]

Well done!😊

[@JaenEngineering]

6:45 this is also known as a cascode amplifier and it has several big features that make it worth it own, full video

[@adanner]

A cascode video is coming soon on Transistors #17.

[@paulperano9236]

Amp with a gain of less than one ... a buffer. To go from a probably high impedance to a low one. Also provide a degree of isolation from the source.

[@sanosanbaby]

Please display dots at the points where intersecting contacts are connected. For example, for two resistors that set bias in the transistor base. It's very eye-straining.

[@stefano.a]

Also the “plus” sign on the generator is missing

[@JaenEngineering]

​@@stefano.athe "generator" is, an AC signal source so it has no "+" output. During the first half of the AC signal it will be +ve, and for the second half of the signal it wil be -ve.

[@stefano.a]

@@JaenEngineering no, the sign has to be placed also for AC sources to analyze the *phase* of the signals in the network.

[@Enigma758]

Nice video, thanks. I've always found the "common" terminology to be a bit confusing. One point I'd like to mention is that I've overwhelmingly seen N channel mosfets being drawn with the arrow pointing in, not out (opposite of BJT conventions).

[@adanner]

The arrow direction also depends on whether the body connection is shown; you may have been seeing examples where it is there.

[@andymouse]

Me to! I look at MOSFET and say to myself 'well its opposite to a BJT !

[@andymouse]

Hmm...do you mean the solid line next to the gate or sometimes its 3 small lines next to the gate ? isn't it something to do with depletion or enhancement channel please clarify if you could or do you already have a vid ?...cheers !@@adanner

[@VandalIO]

What configuration is your fav ?

[@andrejtih7373]

спасибо!!!)

[@user-mc7ez6lm4x]

А теперь попробуйте студентам пересказать, не запутавшись, кто база, а кто гейт.

[@mdesm2005]

2:53: not being connected to the source or the load is one thing, but how do you jump to calling the emitter "common"? why or how does "common" relate to "not connected to either one"? how about "independent emitter" ? I never understood that. But I'm a digital guy, I haven't worked with AC amplifiers much

[@adanner]

It's related to the use of the word "common" to mean a common reference point in a circuit, or ground. So if the emitter is connected to a common point (AC ground) rather than to the input or output then it is common emitter. It sort of applies even when there is a resistor in the path too.

[@mdesm2005]

a common point to what and what? Common if relative to at least two things. I can see the emitter being connected to ground via a cap*, thus connected to AC ground. So it's AC grounded. But base and collector aren't AC grounded. So it's by itself connected to AC ground. (*for some reason you say that even a resistor in the path still makes the emitter connected to AC ground, not sure why). I think you're being paid by big electric to perpetuate this nameology. @@adanner

[@sgifford1000]

Didn't know NPN is better than PNP.