Describe the basic principles of operation of an oscillator. (Hint: To explain the operation, deduce an expression for the gain of a positive feedback amplifier and mention the condition for oscillation in terms of phase angle and open loop gain.) b) Explain the types and applications of following oscillators. i. Wien bridge oscillator, ii. Twin-T oscillator, iii. R-C ladder oscillator, iv. L-C coupled oscillator, v. Transistor oscillator, vi. operational amplifier, vii. crystal oscillator c) Assess the performance characteristics of types of oscillators. (Hint: The discussion shall focus on important parameters of Oscillators such as Frequency, stability, frequency drift, distoration, amplitude and wave shapes