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Chapter 8 Introduction to Amplifiers

2. Objectives. List the three fundamental ac properties of amplifiersDescribe the general model of a voltage amplifierDiscuss how i/p and o/p impedance effect on the effective gain of the circuitStudy the three BJT amplifier configurationsDiscuss the various amplifier operation classesUnderstan

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Chapter 8 Introduction to Amplifiers

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    1. 1 Chapter 8 Introduction to Amplifiers Pictures are redrawn (with some modifications) from Introductory Electronic Devices and Circuits By Robert T. Paynter

    2. 2 Objectives List the three fundamental ac properties of amplifiers Describe the general model of a voltage amplifier Discuss how i/p and o/p impedance effect on the effective gain of the circuit Study the three BJT amplifier configurations Discuss the various amplifier operation classes Understand the concept of dB

    3. 3 Fig 8.1 Typical amplifiers.

    4. 4 Fig 8.2 General amplifier models.

    5. 5 Table 8.1 Gain symbols.

    6. 6 Fig 8.3 Example 8.1.

    7. 7 Fig 8.4 Voltage amplifier model.

    8. 8 Fig 8.8 Combined effects of the input and output circuits.

    9. 9 Voltage Amplifier Characteristics Ideal: Any value of voltage gain (can be infinite if needed) Infinite input impedance Zero output impedance

    10. 10 BJT Amplifier Configurations Common-emitter (CE) amplifier Common-collector (CC) amplifier Common-base (CB) amplifier

    11. 11 Table 8.2 Property ranges.

    12. 12 Fig 8.13 Common-emitter (CE) amplifier.

    13. 13 Fig 8.14 Common-collector (CC) amplifier.

    14. 14 Fig 8.15 Common-base (CB) amplifier.

    15. 15 Table 8.3 A comparison of CE, CC, and CB circuit characteristics.

    16. 16 BJT Terminal Connections

    17. 17 Amplifier Classifications Class A – low distortion, high loss Class B – some distortion, lower loss Class C – high distortion, lowest loss Others Classes D, E, G, H, T

    18. 18 Class A Amplifiers

    19. 19 Class B Amplifiers

    20. 20 Class C (Tuned) Amplifiers

    21. 21 Decibels (dB)

    22. 22 Fig 8.25 dB gains are additive.

    23. 23 The dBm Reference

    24. 24 Summary Amplifier properties BJT amplifier configurations Amplifier classifications Decibels

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