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This is a returning question from a while back (Design a power amplifier) So, in general thanks to help from this site I managed to get to this point and I am very thankful, but now I have to examine my simulations and as a novice I can't really say if my simulations are plausible for a working amplifier! In general I got to have 4 types of simulations: ac-sweep, dc-sweep, stability(I don't know at all what this could mean) and amplification. Below I will be attaching the documentation I have on my amplifier. Is it remotely correct? Why is my amplification truncated on the negative side? Why is the dc-sweep simulation so scuffed at output? What does a stability simulation mean? In need I can link my entire project! Thanks in advance to all! The values when the simulation is doneenter image description here enter image description here

ac-sweep amplification dc-sweep

Dobre Sebastian
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  • I would expect to see something like 18 to 20 volts p-p without clipping. – Andy aka Nov 13 '22 at 16:38
  • 1.5A through a BC846B transistor (a 100mA max device) is not reasonable. Nor is 1.6A quiescent current needed to drive a 133 ohm load. – glen_geek Nov 13 '22 at 16:57
  • @glen_geek Thank you! It was an oversight from me! I fixed it right away and it look much better! – Dobre Sebastian Nov 13 '22 at 17:07
  • It is correctly designed if it fills the specs you are given. Does it fill the specs? It also needs to fill the specs of each component, like no 2A through a 100mA transistor, or allowing 10W dissipation in a 0.1W resistor, etc. – Justme Nov 13 '22 at 17:22
  • There is a problem with the diodes D9,D10,D11,D12. They all have a forward voltage significantly larger than the 0.7 V it should be and the forward currents are a few nA. It's almost as though they are connected reverse biased even though they are shown as being connected correctly forward biased. –  Nov 13 '22 at 20:51
  • ..... as a result, the current sources are sourcing way too much current and overdriving the output transistors. –  Nov 13 '22 at 21:01

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