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So this question is really annoying me for a while so I needed some help.

I am given the output characteristics curve for a CE transistor amplifier. I also managed to draw the load line. They have given me the transistors dynamic input resistance and asked me to find the voltage gain and current gain of the amplifier given the peek of the signal given at the base. Any help on how to proceed would be appreciated. Thank you ^^

Edit: the question and the curve https://i.sstatic.net/s44h2.jpg

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  • \$\begingroup\$ Why don't you show us what you got (e.g. the curves). \$\endgroup\$
    – Stefan Wyss
    Commented Oct 18, 2019 at 13:58
  • \$\begingroup\$ The stack exchange app isn't allowing me to upload images. I'll upload them to imgur in a bit ^^ \$\endgroup\$
    – snoozemonster
    Commented Oct 18, 2019 at 14:07
  • \$\begingroup\$ @StefanWyss done ^^ \$\endgroup\$
    – snoozemonster
    Commented Oct 18, 2019 at 14:15

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You seem to have almost solved the question. I will try to give you a hint how to continue.

You know that distance QA (and QB) is 20uA. So you can see that +/- 20uA variation of Ib leads to ??? variation of Ic, which is the current gain.

You can also draw A' and B' which are the corresponding points for (only) 12uA excitation (when we consider this as a linear problem).

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  • \$\begingroup\$ Ok that makes a lot of sense! Imma try that out ^^ \$\endgroup\$
    – snoozemonster
    Commented Oct 18, 2019 at 14:32
  • \$\begingroup\$ I am guessing for change in input voltage, you use input current and the dynamic resistance? \$\endgroup\$
    – snoozemonster
    Commented Oct 18, 2019 at 14:38
  • \$\begingroup\$ Yes, this is the way to go! \$\endgroup\$
    – Stefan Wyss
    Commented Oct 18, 2019 at 14:39
  • \$\begingroup\$ Thanks a lot! You're the best :) \$\endgroup\$
    – snoozemonster
    Commented Oct 18, 2019 at 14:39

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