#### ehsantech

##### Member level 3

Here is my circuit and dc bias point

and here is ac output voltage

question 1:the output amplitude is too much higher than Dc input voltage what is my mistake or spice mistake?

question 2:if we want to find upper and lower frequency ( cutoff) we should calculate (1/sqr(2))*Vmax and then find the frequencies?

question 3:in below output figure if we want to find upper and lower frequency ( cutoff) we should fine max DB of output voltage and then minus 3db?

question 4:is there any simplest way to find upper and lower frequency in two different above questions(2,3)?