😊 Very good explanation. I noticed that at 13:28, referring to the 2nd transistor, you said Common Collector transistor: actually it is a Common Base. Anyway, waiting for part 2 to complete the lesson...regards from Italy.

Thank you for the shout-out to my video. I agree - our videos often complement each other very well.

Cascode drives in the way you showed here were used (because of the benefits you mentioned) as video amplifiers in old CRT TV-s and monitors. Also, one interesting feature, since the lower device is working with colector (or drane) voltage being arbitrary defined via biasing the upper device, cascodes were also used in industrial offline flyback power supplies, working from input voltage in the range of 200-1000V. They would use some really high voltage bjt (and a slow one also) and drive its emitter via some light, low voltage and low Qgate mosfet. Ofc, these solutions are now obsolete since one can buy SiC, GaN and other "exotic" semiconductor devices (mainly mosfets) working with around a 1.2kV of a drane voltage and also having really small Qgate and Rdson. :)

Vote more circuits , less old measure stuff.. Good content , canot wait part 2.

As always, your videos are a treasure. Thank you.

YES! thanks.The "miller killer".

Thank you very much for the lesson! Why I love physics, you can study it forever!

Thanks, very nice explanation of how they work. I have seen them used in older receivers but never really thought much about how they worked. Makes perfect sense. I will have to play with them once I get my lab set up again after getting new flooring installed. I need to take a trip over to Anchor, haven't been there in months. Craig

Very well explained. Cascode amplifiers are good when a higher frequency response is needed, and you can even add more cascode stages. With a single cascode stage, it is the same as a common base stage. Several years ago I listened to a UBC EE prof give a talk on a company's laser diode driver chip. It used an emitter couple pair with current sources as an output stage. The UBC prof referred to it as a cascode. He was not happy when I corrected him. I don't know if he had designed the custom chip, but I found several problems with it. I had been hired to give an independent evaluation of it.

That begs a cascode chip of the day video: MC1110, CA3028, uA703, and 3N35 NPN Tetrode.

I know cascode circuits with tubes, still a nice explanation.

If my memory does not fail me, a gentleman at Tektronix, by name Gilbert, introduced cascade use for beam deflection in the ever faster oscilloscopes. Two of my (employer’s)early oscilloscopes were rated 450 and 500 kHz. A Solartron scope around the same time was as fast as 5 MHz. Then I found a plug-in module for the old 450 kHz scope, boosting it to 20 MHz. Also, if anybody built Heathkits, there was a 5 MHz scope kit offered. Then came (and stayed for a while) the “standard” 100 MHz rated scopes, thanks Mr. Gilbert.

Brilliant video. I must breadboard this out. You are a great teacher.

Cascode can improve frequency response by factors of 50 or more. In this case the 5.1 k resistance between the amplifiers is limiting the effectiveness; an inductance to block the AC through this path will greatly improve the frequency response. (Or use separate dividers for base bias...)

Excellent, thank you. Actually you explained 5 principles in a very effective way.

Im finding things strange (but really cool) lately because every video i look at has something i need in a few projects im doing.. Like just now before I clicked this video i was thinking of amplifiers.. The universe is been good to me..😊👍🇮🇪

I learned something new

Good stuf Mark I viewd the W2AEW video when it was first published. I'm going back to view it again

Awesome thank you..........cheers.

The miller capacitance is only in inverting amplifiers. The AC voltage across the capacitor is the (voltage gain+1) times the input voltage and efffectively shunts the input to ground at higher frequencies.The effect increases with the amplifier stage gain.

How does a dual gate FET compare to a tetrode (dual grid thermionic tube/valve)?

Cool video

Two 2N2369s would be pretty quick in this circuit, not in a breadboard though!

You are an excellent teacher - explained briefly and effectively! The cascode effect with the dual gate Mosfets was hidden from me until now. Are there also Cascode amplifiers with 3 transistors or can the effect no longer be improved? 73 de DL1LAJ, Andreas

How does a double gate FET compare to a tetrode (double grid thermionic tube/valve)?

Bias the common base transistor with a green LED from a 9v battery (10k) and put the 'totem pole' pair on your curve tracer; the Early effect is also greatly reduced. An order of magnitude lower distortion...

When selecting transistors, what datasheet parameters do you look for to ensure higher bandwidth circuit?

Do the FET versions rely on a similar Miller capacitance effect to make it happen in that topology? I'm guessing so.

Thanks for posting. Question were you an educational instructor at one time?

4:07 😋 Wiggle, wiggle, wiggle Just a little bittle ...

We need less Emitter Bitter, on the whole Wiggle Wiggle.

I admit I must be missing something, but why doesn't the Miller capacitance of the top transistor now become the villain?

The input wiggle shouldn't be more than 10 mV.

The amplifier came from tubes. I believe it meant Cascaded Triodes.