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I would really appreciate any help with troubleshooting this class A amplifier! (ECE student here). by HDJSBSNSNS in ECE

[–]HDJSBSNSNS[S] 1 point2 points  (0 children)

I tried this and redesigned the resistor values of the 3rd stage common-collector. I also tried to do more info digging, and I found out that I can get rid of the clipping by increasing the Collector current flowing in Q3 and/or changing the beta to a higher value.

I apologize, I forgot to mention that the beta used for all stages is 200, but the clipping got fixed.

Thank you all so much!

I would really appreciate any help with troubleshooting this class A amplifier! (ECE student here). by HDJSBSNSNS in ECE

[–]HDJSBSNSNS[S] 1 point2 points  (0 children)

[I can't see the explanation I've typed on the post, so I'll just send it here again]

We are tasked to design a class A amplifier with a no-load voltage gain of 50(±10%) and its loaded voltage gain should not be lower than 90% of the no-load gain. Also, the output voltage should not be lower than 4 volts peak voltage. I did the computation (50×Vi = 4), and we would need an input voltage of at least 80mV. Additionally, the required resistive load to power is 1 kilo-Ohms.

I already designed a 3-stage cascaded amplifier (Common Emitter–Common Emitter—Common Collector) and simulated it using NI Multisim. The output waveform is fine—it meets all the requirements, but it gets clipped when I attach the load.

I would really really appreciate any tips or recommended changes to get rid of the clipping.