Example Sheet 1 Oscillators Describe the different types of linear oscillators.

Question

Example Sheet 1 Oscillators Describe the different types of linear oscillators. Explain how you might choose the appropriate one From the block diagram of a linear oscillator and derive the Barkhausen criteria for oscillation Design a phase shift oscillator to oscillate at 30 kHz. The minimum resistance to be used should be 15 k Ohm. 1. 2. 3. a. Simulate the circuit on a circuit simulator and discuss the results. Design a Wien Bridge Oscillator to oscillate at 20 kHz. 4. Power Amplifier 1. Describe the different classes of power amplifiers. a. Why do we use class AB? 2. Describe the operation of the circuits shown in Figure 1 ei 4 02 VEE-25 V Figure 1 What condition is required for maximum Efficiency? what is the efficiency for V-15V-rms a. b,

Explanation / Answer

Oscillators

Electronic Oscillators are divided into two groups:

This type of Oscillators produce an output having sine waveform.

This type of Oscillators produce an output which has square, rectangular or sawtooth waveform

Sinusoidal Oscillators are futher subdivided into:

Example: Hartley, Colpitts and Clapp etc.

Example: Wien-bridge Oscillator

Example: Tunnel diode Oscillator.

Example: Pierce Oscillator.

Sinusoidal Osillations produced by Oscillators may be (a) Damped or (b) Undumped

(a) Damped Oscillations: Oscillations whose amplitude keeps decreasing with are called damped oscillations.

(b) Undamped Oscillations: Oscillatios whose amplitude remains constant i.e. does not change with time are called undamped oscillations. These are produced by those oscillator circuits which have no losses.

Power Amplifier

The power amplifiers are classified according to the conduction angle they produce.

Conduction Angle is the angle that measures the portion of a input cycle that is reproduced at the output of a power amplifier.

a. We use Class AB amplifier

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