Common Emitter Examples (12-Transistors)
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- Опубліковано 5 лют 2025
- Full gain calculation in common emitter amplifier circuits. How to design any desired gain from common emitter stages. Full derivations and analysis.
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 with help of CIT, NUS.
Hello Prof. Danner,
Thank you for all the time and efforts you put in producing these training films on transistor designs.
I would like to see the explanation of the thermal stabilisation coefficients in this same common emitter amplifier stage. In some industrial and military applications I have to set as starting point the thermal stabilisation, and that calls for an high value of the emitter resistor, and low value of the base resistors.
For the same reasons, I often use a single stage, with two DC-coupled transistors, with both DC and AC feedback, so to have a very stable rest point, low distortion and wide bandwidth.
Your work is very appreciated.
Greetings,
Anthony
This was a fabulous presentation. I really appreciate that you dove deep when necessary but kept us aware of the high level requirements and constraints. This would've is been great 25 years ago during my degree!
Thank you!
Awesome Aaron, it's great to do the maths and also some picking ballpark numbers and fitting them and checking that the results do what we want....cheers.
Professor Aron, Please explain MOSFETS from basics in similar manner. There is a need of a huge audience that is waiting to learn from your Channel. I have already subscribed to your channel and Like the videos you are presenting . Thank you ::)
Really enjoy the videos but feel it would be nice to drill down more on the exact calculations for the capacitors.
I realize that staying above certain values guarantees the signal integrity but if looking at everything, I think it would be helpful to include them.
Thanks and great job on going through multiple examples.
73...
great videos
Can you cover the efficiency and linearity aspect of these ckts as well
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In the 2nd example, I think you should not neglect the 10uF capacitor since the freq is only 10K the capacitor impedance is about 1.5 ohm. Love your video, although I had good teachers at school, I wish you were one of them.
I just checked it on LTSpice and the actual gain is around -58 rather than -63 as calculated so I think it's still ok but you're right that the 10 uF is the cause of this undesirable filter. A 100 uF would have been a better choice there.
What if our load becomes smaller from 900 ohm's to 8 ohms
Why is BJT still focused in NUS? Shouldn't CMOS have more emphasis?
CMOS is mostly used for digital circuits. While it can be used for analogue, BJTs have a lot of advantages and are easier to design