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

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Presentation on theme: "Basic Electronics Ninth Edition Basic Electronics Ninth Edition ©2002 The McGraw-Hill Companies Grob Schultz."— Presentation transcript:

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

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

3 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

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

5 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 phase inversion  no current gain, but has voltage and power gain

6 Common-Emitter Amplifier R1R1 C1C1 RLRL R2R2 C2C2 RERE

7 Common-Collector Amplifier R1R1 C1C1 R2R2 C2C2 RERE

8 Common-Base Amplifier R1R1 C1C1 RLRL R2R2 C2C2 RERE C3C3

9 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

10 Class A Operation Collector Current Waveform 0 ICIC Time 360° conduction

11 Collector Current Waveform Class B Operation 0 ICIC Time 180° conduction

12 Collector Current Waveform Class C Operation 0 ICIC Time  90° conduction

13 V CE ICIC IBIB Measuring Transistor Characteristics

14 Collector Family of Characteristic Curves V CE in Volts I C in mA 20  A 0  A 100  A 80  A 60  A 40  A

15 Gain of Junction Transistors Beta (  )  Defined as the ratio I C /I B  Determines the current gain of CE amplifiers  Typical values are 10 to 300 Alpha (  )  Defined as the ratio I C /I E  Values less than 1, typically 0.98 or 0.99

16 Transistor Gain IEIE ICIC IBIB  mA I I E C  100  A 10 mA 10.1 mA  A mA I I B C  

17 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.

18 D S G R1R1 C1C1 RLRL RSRS Common-Source Amplifier C2C2

19 D S G R1R1 C1C1 RSRS Common-Drain Amplifier C2C2

20 D S G R1R1 C1C1 RLRL RSRS Common-Gate Amplifier C2C2 C3C3


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