So..
This is my diagram and i need to meet a few specs:
1) must be at least 20k Input resistance (which mine comes out to about 22k if i did the calculations correct)
2) total gain of at least 50 (i calculated this to be -93.93 so I should be fine on that)
These are my two main concerns:
3) should work with an AC input voltage of 1 mV (I tried simulating this on Pspice but I can't even get an output..)
4)voltage gain must be > 50 for frequencies 20-20kHz..
Firstly I dont know what the value of Beta is.. So I just guessed it to be around 156 by using a simple BJT circuit... I think i have to use that graph of Ic vs Ib and the line Vcc/Rc but I don't really know how to produce that graph.. but thats not as important as getting the biases correct
I plan on replacing the current sources with current mirrors, because if Ie is positive in that direction then we know the BJTs are active.. Unless someone has a better ideas instead of making it super messy with current mirrors, how would I go about biasing that circuit to make all 3 BJTs in active mode? My calculations were all right I believe but I can't seem to get the right output on PSPICE. If someone could give me a hint or help me out i'd really appreciate it..