d) The voltage gain and feedback ratio of an oscillator are given below. Determine the oscillation frequency of this oscillator and the conditions to be met for sustained oscillation. A 1 RA RB 1 3+j (2ƒCR-CR) e) Cross-over distortion exists in Class B complementary-symmetry push- pull amplifiers. With the aid of a circuit diagram, explain your solution to eliminate the cross-over distortion for this amplifier. Q4. a) An amplifier has fixed input and output impedances. A feedback network is connected to the amplifier to decrease its input impedance and increase its output impedance. What type of the feedback connection is needed to meet this request? Sketch the feedback connection type. b) The open-loop voltage gain of an op-amp is A1 = 10,000 and its open- loop bandwidth is BW = 1000 Hz. In order to increase its bandwidth to 5 MHz, we can achieve this by connecting the op-amp to feedback circuit. Design a feedback circuit to meet this requirement and explain your solution. c) The magnitude and phase change of the loop-gain of a feedback circuit are listed in Table 2 below. Draw the Nyquist diagram and discuss if the circuit is potentially stable or not. Table 2 BAO 1 2 2.5 3 2.5 2 1 0 180° 135° 90° 45° 0° - 45° - 90° - 135° - 180°

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