problem1) Answer all the problems:
a) Describe why positive feedback and not negative feedback is essential to produce oscillators.
b) What is feedback in amplifiers. prepare down the difference between current and voltage feedback?
c) Describe why BIT’s are called bipolar devices while FET are called unipolar devices and how divine current is controlled in JFET.
d) What do you mean by reverse saturation current of a diode?
e) What is the importance of stability factor in transistor operation.
problem2) describe and prove reciprocity theorem.
problem3) Draw the circuit diagram of Huntley oscillator and briefly describe how the oscillations are maintained in this oscillator.
problem4) Draw a block diagram of feedback amplifiers in the following configuration.
i) Voltage series feedback.
ii) Voltage shunt feedback. Determine an expression for voltage gain of an amplifier with negative feedback in configuration.