Response to the following problem:
For the base-current-compensated mirror of Fig., show that the incremental input resistance (seen by the reference current source) is approximately 2VT /IREF. Evaluate Rin for IREF = 100 μA.
(Hint: Q3: is operating at a current IE3 = 2IC/β, where IC s he operating current of each of Q1:and Q2: Replace each transistor with its T model and neglect r0.)
