I have a few questions regarding analysis of the amplifier schematic below. Bear in mind that the resistor values have not been decided yet and are just copy-paste for now. The only requirements of the amp are that it drives an 8 ohm speaker with a supply rail of +16V and a total voltage gain of 1500 minimum (I know I am likely to have to add stages).
How is the best way to work out biasing the current mirror to provide the correct current? Previously we were given equal values of 1mA for each branch off the supply rail (so as not to cause current drive between stages I believe?), with 2mA coming from the current mirror. Should I use this arbitrary 1mA as a starting point to find resistor values?
In the amp's quiescent state, I understand that the voltage at the collector of Q8 should be 8V ideally, to allow for maximum output swing. How can I calculate the voltage at the base of Q8? I feel like I'm missing something obvious related to Q8 itself, and maybe assumptions on its Vbc?.
We have been told previously that as a rule of thumb the load resistance (R3 in this case??) should be a tenth of the circuit's output resistance. Is that true for this configuration? What about R2? That rule was given on a circuit without an R2.
I hope these questions aren't too simple, but we have never studied a circuit quite like this, and I am finding it hard to find a similar example online. Of course I don't want the answers outright, I'm just struggling with where to start. I am not confident enough that the addition of a couple of resistors or removal of negative supply doesn't throw me completely!
Thanks for reading, and for any advice you can give!