Semiconductor Devices: CE Amplifier Distortion Simulation

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This time around, we examine a method of reducing the total harmonic distortion (THD) of a common emitter amplifier through computer simulations. The method proves effective, at the cost of reducing voltage gain.
References: Semiconductor Devices: Theory and Application; Chapter 6, section 3; and chapter 7, section 3.
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Опубликовано:

6 сен 2024

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Комментарии : 12

@simonyoungglostog Год назад

Thank you. That was really useful. It would be interesting to see a side-by-side of a 2-stage CE circuit compared to a single stage for THD differences. I found a free product called Microcap (used to cost thousands but they closed down and allowed everyone to use the SW for free, it's updateable). I love your teaching style and enthusiasm.

@ElectronicswithProfessorFiore Год назад

The trick is to design two circuits that are otherwise identical in performance (gain, Zin, Zout, bandwidth, etc.). I'll look into doing a video on that. I have a bunch of other things in the pipeline so it won't be real soon. Regarding Microcap, I recall that it went freeware a few years back. I tried it but thought that the learning curve might be a bit steep compared to some other free simulator (TINA-TI, LTSPICE, et al). What aspects of it do you like/dislike compared to the other simulators?

@simonyoungglostog Год назад

@@ElectronicswithProfessorFiore I use LTSpice as well. Microcap can show current, voltage, power and state of transistor (off, saturation, active) 'live' while you make changes. There are more complex analysis available and stepping of different components.

@murraychen9436 10 месяцев назад

In a single supply system, if Av, RL, VCC, and vin are known, how we start to design this BJT CE VDB swamped amplifier?

@ElectronicswithProfessorFiore 10 месяцев назад

You should also have some idea of required Zin and the size of the output voltage swing. If load impedance and desired Av are known, that tells you the required size of the swamping resistance. A common bias starting point is to set Vc at half Vcc (although you'd probably need to tweak that to get the desired results).

@murraychen9436 10 месяцев назад

By the way, for this design, how can we set the Q-Point as close as possible to the middle of AC load line?

@ElectronicswithProfessorFiore 10 месяцев назад

I suggest looking at class A power amp analysis (either videos here or my free semiconductor devices text- links in description above). Basically, you have to juggle the load impedance with Vceq and Icq. I should add, though, that if this is a small signal amplifier, you don't necessarily need to have the Q point centered. As long as you can get sufficient peak-peak swing to drive the power stage fully, you're good.

@Chris-hi2hn Год назад

Does the simulator or one you know of support 6502 or 4004 cpus? I'm looking at simulating or emulating an old computer.

@ElectronicswithProfessorFiore Год назад

A 4004? Wow, that's reaching back! TINA-TI doesn't have those built-in as I recall but I know I have seen some simulators with more recent CPUs. Can't remember off the top of my head, though.

@neixian Год назад

Hi Professor, what software are you using please?

@ElectronicswithProfessorFiore Год назад

This is TINA-TI, the free version of the TINA simulator that you can get via Texas Instruments (ti.com). It runs on Windows. If that doesn't work for you, you can try the on-line student version which is quite nice (TINA Cloud, Student) which is $14 for 1 year access or $28 for 3 years. (tina.com)

@neixian Год назад

@@ElectronicswithProfessorFiore Thank you very much Professor!