D 13.47 (a) Find the input common-mode range of the circuit in Fig. 13.15 assuming R1 = 0 and the current source I1 is simply a pnp transistor biased in active mode with VCC = 3V.
(b) Give the complementary version of the input stage in Fig. 13.15; that is, the one in which the differential pair is npn. For the same conditions as in (a), what is the input common-mode range?
(a) 0.1 V ≤ VICM ≤ 2.2 V; (b) 0.8 V ≤ VICM ≤ 2.9 V
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