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# Electronics Devices and Circuits Questions

Define intrinsic and extrinsic semiconductors with examples. By using bond diagram as well as energy band diagram, illustrate how majority and minority charge carriesares are created in p-tye material. Why does doped material remain electrically neutral?

Explain the effects of forward and reverse bias upon deplection region width, barrrer potential, majority carriers and minority charge carriers orf a pn-junction using necessary diagrams. Demonstrate forward and reverse characteristics curves. Define recerse satuurtation current.

Sketch common emitter, common base and common collector circuit connections of an npn transistor including perfect bias voltages of power supply. Indicate input-output current and voltage in each circuit.

Define intrinsic and extrinsic semiconductors with its examples. By using bond diagram as well an energy band diagram. Illustrate how majority and minority charge carriers are created in p-type material.

Define reverse saturation current. Explain the effects of forward and reverse bias upon depletion region width, barrier potential, and majority and minority charge carriers of pn-junction using necessary diagrams.

Draw and explain the I-V characteristics curve of an ideal and practical diode.

What is MOSFET? What are the advantages of MOSFET over FET?

Discuss the construction and operation of an n-channel enhancement type MOSFET.

Explain JFET as an amplifier.

Mention the electrical characteristics and applications of operational amplifier.

Sketch an operational amplifier integrator circuit, Derive an equation for the output voltage in terms of input.

Why open loop op-amp is not used in linear ac application.

Design and construct a non-inverting amplifier circuit using operational amplifier to obtain output voltage five times greater than input voltage.

Define the following terms: i) CMRR ii) Slew rate iii) Input offset voltage.

Design a first order low pass filter at a cutoff frequency of 1KHZ with a pass bang again.

Draw a common emitter amplifier circuit with coupling capacitor and bypass capacitor. Also show the input and output waveforms. What are the functions of coupling capacitor and bypass capacitor? Briefly explain the operation of the amplifier circuit.

Course Title: Electronics Devices and Circuits (Theoretical).

Write down the similarities and dissimilarities between BJTs and FETs.

Draw the basic construction of a p-channel JFET. Apply the proper biasing between drain and source and sketch the depletion region for Vgs = 0V.

Why is the input impedance to a JFET so high?

Why is the terminology field effect appropriate for this important three terminal device?

Define the following electrical parameters:
Input offset voltage, input resistance, CMRR, and output voltage swing.

Explain why open loop configurations are not used in linear applications.

What are the characteristics of an Ideal Op-AMP?

Explain why open loop configurations are not used in linear applications.

Define the following electrical parameters:
Input Offset Current, Input Offset Voltage, Input Voltage Range, and CMRR.

What is feedback? List two types of feedback. Which type is used in linear applications?

Define a filter. How are filters classified?

Design a second order low-pass filter at a high cutoff frequency of 1 KHz.

Define an oscillator. Design a square wave oscillator so that fo=1KHz. The Op-Amp is a 741 with de supply voltage=[+15V,-15V]

Define intrinsic material, extrinsic material and regative temperature coefficient.

Describe the difference between n-type and p-type semiconductor materials.

Describe in your own words the conditions established by forward and reverse bias on a p-n junction diode and how the resulting current is affected.

Explain the operation of a full wave bridge rectifier.