1. The OP-amp circuit in the following figure is used to generate a sinusoidal signal.
Show the condition of oscillation and derive the expression for the frequency of oscillation and the gain needed to maintain the oscillation as a function of C1, C2, C3, R1, R2, R3, R4 and R5.
•2. Design an oscillator based on this circuit to obtain a frequency of 1 kHz. We must consider R1 = R2 = R3 = R and C1 = C2 = C3= C. give the values ??of all the components of the circuit according to the standardized values ??of appendix A
•3. Propose a modification of the circuit to ensure oscillation immediately when starting the circuit and explain the principle of its operation. Give the modified scheme?
