Analog Electronics AGH Exercices

3 Operational amplifiers

Exercise 1.a

Show that for given input signals, the output signals of the circuit shown in figure 1.a are respectively :

R,G,B . Assume that Y= 0.3R+0.59G+0.11B

Figure 1.a

Exercise 1.b

Show that for given input signals, the output signals of the circuit shown in figure 1.b are respectively :

a (R-Y) ; b Y and c (B-Y) . Find values of a, b et c.

. Assume that Y= 0.3R+0.59G+0.11B

Figure 1.b

Exercise 2 Nonlinear amplifier

Show that the output/input characteristic V_s=f(V_e) for the circuit show in Figure 2 assumes a form as shown in fig.3. The diodes are perfect (UF=0, Rd=0)

Illustrate this characteristics for R₁ = 1 kΩ ; R₂ = 10 kΩ ; R₃ = 20 kΩ ; R₄ = 10 kΩ ; R₅ = R₄ ; R₆ = R₃  Determine G1,G2, Ve⁺ i Ve^-

Figure 2

Figure 3