The current mirror circuits are not always readily identifiable by a novice. We normally remember the common configurations. The basis on how it works is not usually explained in words, but computed using maths.
Try computing it yourself. You'll learn more than simply asking for answers. Remember the final aim is to compute Ic/Iref, and to prove that it is approximately 1 for large beta. The following are some points in which you should take note.
1. Transistor Law Ic=betaxIb
2. If Q1 and Q2 are matched transistors, Ib1=Ib2
Just do the maths and as long as you can prove that Ic/Iref is approximately 1, that would imply that R sets the reference (ie constant) current Iref, and that would be "mirrored" by Ic. Since Iref is constant, Ic will also remain constant, regardless of load Rc.
So when i hook up a LOAD to the output of a constant current source or a current mirror by changing the Load resistance the current stays the same how ?
Does the Constant current source use feedback to self adjust it self?
I know its sets a FIX voltage at the Base of the transitor does it "compare" the base voltage with the emitter voltage drop? to self adjust
So when i hook up a LOAD to the output of a constant current source or a current mirror by changing the Load resistance the current stays the same how ?