Transistor and FET Experiments

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Questions and Answers

What does the cutoff frequency define in the frequency response of the amplifier?

The frequency at which the gain is halved (correct)

The frequency with the highest output voltage

The maximum frequency responding to the output

The frequency at which the input signal is zero

What is the first step in the procedure for designing a common source FET amplifier?

Set the input sine wave value using CRO

Construct the circuit as shown in the circuit diagram (correct)

Vary the frequency from the AFO

Draw the graph of frequency response

Which formula is used to calculate gain in decibels (dB)?

Gain = (V0 + Vin) / 2

Gain = 20 log(V0/Vin) (correct)

Gain = V0 - Vin

Gain = Vin/V0

In the frequency response plot, what is typically shown on the X-axis?

Frequency in Hertz Signup and view all the answers

How do you determine the bandwidth of an amplifier?

By finding the difference between upper and lower cutoff frequencies Signup and view all the answers

What component is primarily used to create a common source FET amplifier?

Field-Effect Transistor (FET) Signup and view all the answers

When varying frequency in the setup, what equipment is used to observe the output voltage?

Oscilloscope Signup and view all the answers

What is the significance of noting the output voltage during the procedure?

It helps in calculating the gain of the amplifier Signup and view all the answers

What is the primary aim of the experiment involving the Darlington pair?

To design a current amplifier and calculate the gain Signup and view all the answers

In the context of the frequency response of a current series amplifier, what is being found during the experiment?

Bandwidth with and without feedback Signup and view all the answers

What does the 3dB line help to determine in the frequency response graph?

The lower and upper cutoff frequencies Signup and view all the answers

When constructing the current amplifier circuit, which component's value is primarily referenced from the datasheet?

Collector current (Ic) and hfe (β) Signup and view all the answers

What type of wave form should the input signal be set to during the experiment?

Sine wave Signup and view all the answers

What mathematical formula is used to calculate the gain in dB for the amplifier?

Gain (dB) = 20 log(Vout/Vin) Signup and view all the answers

Which component is essential in forming the current series amplifier as per the provided diagram?

Capacitor (C1) Signup and view all the answers

What is typically plotted on the X-axis of the frequency response graph?

Frequency Signup and view all the answers

What is the formula to calculate the resonant frequency in a circuit?

$f = \frac{1}{2\pi \sqrt{LC}}$ Signup and view all the answers

In a Hartley oscillator, how is the total inductance of the coils represented?

$Leq = L1 + L2$ Signup and view all the answers

What voltage is set for VCC when making connections in the procedures described?

12 Signup and view all the answers

What is the relationship between the frequency of oscillations and the equivalent inductance and capacitance in a Hartley oscillator?

Frequency is inversely proportional to the square root of the product of inductance and capacitance Signup and view all the answers

Which component is NOT mentioned as part of the Colpitts oscillator circuit diagram?

L1 Signup and view all the answers

Which measurement is NOT part of the procedure for evaluating the oscillator output?

Calculate the phase shift of the output Signup and view all the answers

In a Colpitts oscillator, what is the primary purpose of the capacitors CIN and COUT?

To provide feedback Signup and view all the answers

What type of configurations are typically used for the oscillator circuits discussed?

Tank and feedback configurations Signup and view all the answers

What is the relationship between frequency and time period for an oscillator?

Frequency is the reciprocal of time period. Signup and view all the answers

In a UJT relaxation oscillator, what does the variable $\eta$ represent?

The ratio of resistances in the circuit. Signup and view all the answers

Which piece of equipment is essential for observing the output in a UJT relaxation oscillator?

An Oscilloscope. Signup and view all the answers

What is the expected relationship between experimental and theoretical output frequency in oscillators?

Experimental values may vary from theoretical due to real-world factors. Signup and view all the answers

What is the primary function of a resistor in a UJT relaxation oscillator circuit?

To limit the current flow to the UJT. Signup and view all the answers

When varying the voltage $V_{EB}$, what will you observe?

A corresponding change in current $I_E$. Signup and view all the answers

What is the primary purpose of the circuit diagram in the UJT relaxation oscillator experiment?

To provide a visual representation of component connections and layout. Signup and view all the answers

What would result from using a capacitor with a higher value in a UJT relaxation oscillator?

A longer time period for oscillation. Signup and view all the answers

What determines the time constant T2 in the described circuit?

R2 and C2 Signup and view all the answers

When will transistor Q2 turn ON?

When C2 supplies voltage to the base of Q2 Signup and view all the answers

What is the expression for the total period T in the symmetrical circuit?

T = 1.38RC Signup and view all the answers

What values are chosen for the resistors R1 and R2 in practical applications?

10K each Signup and view all the answers

What is the maximum collector current (ICmax) specified in the circuit?

10mA Signup and view all the answers

What is the theoretical frequency formula derived from the total period T?

F = 1 / (1.38 RC) Signup and view all the answers

What is the role of capacitors C1 and C2 in the complementary push-pull amplifier circuit?

To couple and decouple AC signals Signup and view all the answers

What is the saturation voltage at the base-emitter junction of the transistor indicated in the specifications?

0.7V Signup and view all the answers

Study Notes

Transistor as a Switch

The experiment involves observing the input and output waveforms of a transistor acting as a switch
The experiment uses a transistor as a switch, with input and output waveforms observed using a CRO (Cathode Ray Oscilloscope)
The experiment measures and records the input and output voltage and time periods for different transistor types:
- Transistor
- FET
- MOSFET
- CMOS

Design of Common Source FET Amplifier

The goal is to design a common source FET amplifier and plot its frequency response
The experiment uses a FET (Field Effect Transistor) amplifier with a common source configuration
The experiment measures and records the input and output voltage and time periods for different frequencies
The experiment determines the lower and upper cut-off frequencies by observing the 3dB point on the frequency response graph
The experiment calculates the bandwidth of the amplifier

Design of Current Amplifier using Darlington Pair

The experiment involves designing a current amplifier using a Darlington pair and calculating its gain
The experiment utilizes a Darlington pair configuration for current amplification
The experiment measures and records the input and output voltage and time periods for different frequencies
The experiment determines the lower and upper cut-off frequencies by observing the 3dB point on the frequency response graph
The experiment calculates the bandwidth of the amplifier

Frequency Response of Current Series Amplifier

The experiment involves constructing and analyzing the frequency response of a current series amplifier using a BJT (Bipolar Junction Transistor)
The experiment implements a current series amplifier with and without feedback, and measures the frequency response
The experiment determines the bandwidth of the amplifier with and without feedback

Design of Hartley/Colpitts Oscillator

The experiment aims to design and test both Hartley and Colpitts oscillators, measuring their output frequencies
The experiment uses a Colpitts oscillator circuit with an LC tank circuit, measuring the oscillations' frequency
The experiment uses a Hartley oscillator circuit with an LC tank circuit, measuring the oscillations' frequency
The experiment compares the theoretical and practical values of the oscillator's output frequency

Study the Characteristics of UJT and Design a Relaxation Oscillator using UJT

The experiment involves studying the characteristics of a UJT (Unijunction Transistor) and designing a relaxation oscillator using it
The experiment analyzes the input current (IE) and voltage (VEB) characteristics of a UJT, plotting them on a graph
The experiment designs a relaxation oscillator using a UJT, measuring the various parameters such as the valley point (Vv), peak point (Vp), time period, and frequency

Design & Study of Astable Multivibrator

The experiment aims to design and study an astable multivibrator circuit using two transistors (Q1 and Q2)
The experiment analyses the output voltage waveforms at the collector and base of both transistors, measuring the frequency and time period
The experiment compares theoretical and practical values of the astable's output frequency

Frequency Response Characteristics of Complementary Symmetry Push-Pull Amplifier

The experiment aims to analyze the frequency response of a complementary symmetry push-pull amplifier
The experiment uses a push-pull amplifier configuration with NPN and PNP transistors, measuring the amplifier's frequency response
The experiment measures the input and output voltage, gain, and bandwidth of the amplifier for different frequencies

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Description

This quiz covers experiments related to transistors and FET amplifiers. You will explore the transistor's function as a switch and the design of a common source FET amplifier, including measuring input/output voltages and determining frequency responses. Test your knowledge on various transistor types and their operational parameters.