Question

2. What are the conditions for a circuit to oscillate? counts. 3. What is the importance of oscillators? Suggest application where they can be used?

Answer 1

era circuit for a.ee conditions 2) What are the to oscillate ? Normal oscillator circuit es - - Amplifier feedback circuit when the feedback is positive, the overall gain of the amplifier is A Af = AB where, AB is feedback factor or loop gain if AB=1, Af=x. Thus the gain becomes infinity, there is ou put without any input [AB=1 is known as Barkhausen criterion of oscillations. Baskhausen criterion of oscillations States that - is the total phase shift around the loop, as the signal proceeds from input through amplifier, sedback network and back to imput again 0° or 360°

hote (2) magnitude of the product of the on gain if amplifier H and seedback & Bin unity IABI=1 of – ABI. Satisfying the above two conditions, circuit works on as oscillator producin sustained of constant frequency and magnitude (3) what is the importance of oscillators Suggest application where they can be used? importance : - - An oscillator is a device which genoot an alternating voltage roders An oscillator is a circuit which a ac output signal without requirih i an any externally applied input signal. ii) The oscillator converts de energey into aC energey at a very high requency in An oscillator is used to generate particular frequency of a signal. An Re. osuillators generates how frequency signal. An Le osuillator generaters signal. An op-Amp based oscillator operates in stable frequency v oscillators can be used of the microcontroller (the clock is the most essential part of micro controler]

13 w Application - i oscillators are used as sweep circuit is cire TV sets and cro. 1) Haurtley oscillator are mainly use radio receivers. in oscillators are used in RADAR, sensors, Navigation etc. iv) oscillators are used to generate signal like local oscillator to transform the RF signals to If signals en as receiver y the oscillators are used in a transmitter circuit to generate RF cassies w It is used in digital system to. generate clock .