Given a Class A amplifier, verify the dc and ac performance.

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REET 420 Week 3 Lab DeVry

REET 420 Week 3 Lab Overview

Objectives

• Given a Class A amplifier, verify the dc and ac performance.
• Understand the difference between a Class A and a Class B amplifier, and be able to calculate the resistor values to establish Class B operation.
• Be able to use an inverting amplifier using a push-pull configuration.
• Continue to develop expertise with Multisim.

Parts List

Software

• Multisim 11

Introduction

To deliver more power than is possible using op amp integrated circuits, you have to build an amplifier circuit from discrete components, including resistors, capacitors, diodes, transistors, and op amps. You can build discrete amplifiers capable of delivering several watts of power. The laboratory uses a Class A, common-drain amplifier; a Class B, push-pull amplifier; and a Class B amplifier with an op amp driver as examples. Before beginning your Lab, download your Lab cover page here (Links to an external site.).

Required Software

This Lab will use the following Lab Resources:

• Virtual Lab – Citrix

Use a personal copy of the software or access the Lab Resources, go to the Course Resources page – Lab Resources section.

Lab Steps

STEP 1: The Class A, Common-Drain Amplifier

1. When modeling the Class A, common-drain amplifier, the capacitors and the dc voltage supply are replaced with shorts. Using the circuit in the figure below, verify the dc and ac performance of the amplifier.
2. Using the oscilloscope function, determine how large the output can be before it begins to distort.
3. Calculate the power required by the supply and the power delivered to the load. (Show all work for full credit.)

Image Description  (Links to an external site.)

STEP 2: The Push Amplifier

1. Given the circuit shown in the figure below, verify that the transistor is biased at I_D = 0 A_dc.
2. Calculate the gate voltage, v_g, when V1 = 40 V_p.
3. Simulate the circuit to verify your results, and include figures of the voltage and the current readings in your report.
4. Show the graph of the voltage across the output resistor R3.
5. Calculate the power dissipated by the load when V1 = 40 V_p.

Image Description  (Links to an external site.)

STEP 3: The Inverting Amplifier Using a Push-Pull Configuration

1. Design an inverting amplifier to meet the following requirements.e_in = +4 dBu at audio frequencies40 W to a 5 Ω loadinput impedance 4.9 k ΩT_A = 40° C and T_{j max} = 140° Cpower supplies: ±18V_dc and ±28V_dc, each at 6 A_dcShow all work. Enter the finished schematic in Multisim for full credit.

STEP 4: Questions and Discussion

1. Carefully explain how to properly configure a Class A amplifier to produce very little distortion.
2. Explain the common ways to protect your amplifier design from catastrophic failure.

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