modified 12 years ago

Ce amp

01:14:09

Biasing still not proper 

published 12 years ago

rbrtkurtz

12 years ago

They can be a bit of a pain until you get used to them. But having nice round numbers like 100mV input and 20V Vcc helps make the math simpler. What are your output requirements?

thebugger

12 years ago

The biasing is correct but you are overdriving the amp. Decrease the signal to 10mv and you'll see a nice round output with a gain of around 20. If this doesnt match your requirements then you must tweak it to your needs.

thebugger

12 years ago

Or you can just decrease the collector and the emitter resistor to 300ohm but this chops your gain to 13.

dkobe

12 years ago

The input is way to hi. Your voltage gain is calculated by Rc in parallel with Rl dvided by r'e. R'e is about .035 ÷ Ic. Since RE is completely bypassed, your gain is very large. Changeup the lower base R to 15k. Lower the input to 5mv (10mv pp). RL is low which right now is 800 ohms. Kind of low for a CE amp. Raising RL from 1 k to 4k will allow a

dkobe

12 years ago

total RL to be higher allowing a larger Vpp output with low visible distortion. If you want to keep RL at 1k, add a small resistor (100 ohms ) between thr emitter and the RE- cap combo. This will lower the gain, but yield a nice output signal. Good luck.

qtronics

12 years ago

Ty for suggestion I will implement it in two stage ampr :)

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