Basic Electronics Ninth Edition Grob Schultz

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Presentation transcript:

Basic Electronics Ninth Edition Grob Schultz ©2002 The McGraw-Hill Companies

Transistor Amplifiers Basic Electronics Ninth Edition 30 CHAPTER Transistor Amplifiers ©2003 The McGraw-Hill Companies

Topics Covered in Chapter 30 Circuit Configurations Class A, B, or C Operation Analysis of Common-Emitter (CE) Amplifier Collector Characteristic Curves Letter Symbols for Transistors

Topics Covered in Chapter 30 (continued) FET Amplifiers Types of Distortion Negative Feedback Troubleshooting Amplifier Circuits

Types of Amplifiers for Junction Transistors Common-Emitter (CE) phase inversion voltage, current, and power gain Common-Collector (CC) no phase inversion no voltage gain, but has current and power gain Common-Base (CB) no current gain, but has voltage and power gain

Common-Emitter Amplifier RL C1 C2 R2 RE

Common-Collector Amplifier RE

Common-Base Amplifier RL C2 C3 R2 RE C1

Classes of Operation Class A 360° conduction least distortion, least efficient Class B 180° conduction Class C less than 180° conduction most distortion, most efficient

Class A Operation 360° conduction IC Time Collector Current Waveform

Class B Operation 180° conduction IC Time Collector Current Waveform

Class C Operation  90° conduction IC Time Collector Current Waveform

Measuring Transistor Characteristics VCE IB

Collector Family of Characteristic Curves 2 4 6 8 10 12 14 16 18 VCE in Volts IC in mA 20 mA 0 mA 100 mA 80 mA 60 mA 40 mA

Gain of Junction Transistors Beta (b) Defined as the ratio IC/IB Determines the current gain of CE amplifiers Typical values are 10 to 300 Alpha (a) Defined as the ratio IC/IE Values less than 1, typically 0.98 or 0.99

Transistor Gain 10 mA IC 100 mA IB 10.1 mA IE 100 10 = A mA I m b 99 . 1 10 = mA I E C a 10.1 mA IE

Types of FET Amplifiers Common-Source Corresponds to a CE circuit for a junction transistor: signal inversion, voltage gain and power gain. Common-Drain Corresponds to a CC circuit for a junction transistor: no signal inversion, no voltage gain, has power gain. Common-Gate Corresponds to a CB circuit for a junction transistor: no signal inversion, voltage gain and power gain.

Common-Source Amplifier RL D G C2 C1 S R1 RS

Common-Drain Amplifier G C1 S R1 C2 RS

Common-Gate Amplifier RL D G C2 S C3 R1 RS C1