1.45 The diode cut-in voltage is V₁ = 0.7 V for the circuits shown in Figure| P1.45. Plot Vo and ID versus I, over the range 0 < I ≤2 mA for the cir- cuit shown in (a) Figure P1.45(a), (b) Figure P1.45(b), and (c) Figure P1.45(c). 41 (a) I 4↑ ww www RF ID + Vo 1 kQ D₁ ō ID R₁₁ = Vo + 1 ΚΩ VB = 1 V (b) D₁ RF= 1 ΚΩ (c) Figure P1.45 ID1 D2 ID2 Vo