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Chapter 12 Field-Effect Transistors

Chapter 12 Field-Effect Transistors. Chapter 12 Field-Effect Transistors. Understand MOSFET operation. 2 . Analyze basic FET amplifiers using the load-line technique. 3 . Analyze bias circuits. 4 . Use small-signal equivalent circuits to analyze FET amplifiers.

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Chapter 12 Field-Effect Transistors

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  1. Chapter 12Field-Effect Transistors

  2. Chapter 12Field-Effect Transistors • Understand MOSFET operation. • 2. Analyze basic FET amplifiers using the load-line technique. • 3. Analyze bias circuits.

  3. 4. Use small-signal equivalent circuits to analyze FET amplifiers. 5. Compute the performance parameters of several FET amplifier configurations. 6. Select a FET amplifier configuration that is appropriate for a given application. 7. Understand the basic operation of CMOS logic gates.

  4. NMOS AND PMOS TRANSISTORS

  5. Operation in the Cutoff Region

  6. Operation in the Triode Region

  7. Operation in the Saturation Region

  8. MOSFET Summary

  9. LOAD-LINE ANALYSIS OF A SIMPLE NMOS AMPLIFIER

  10. To establish the load line, we first locate two points on it.

  11. Amplifier Analysis Amplifier analysis has two steps: 1. Determine the Q point. 2. Use a small-signal equivalent circuit to determine impedances and gains.

  12. The Fixed- Plus Self-Bias Circuit

  13. SMALL-SIGNAL EQUIVALENT CIRCUITS

  14. COMMON-SOURCE AMPLIFIERS

  15. The Small-Signal Equivalent Circuit In small-signal midband analysis of FET amplifiers, the coupling capacitors, bypass capacitors, and dc voltage sources are replaced by short circuits. The FET is replaced with its small-signal equivalent circuit. Then, we write circuit equations and derive useful expressions for gains, input impedance, and output impedance.

  16. Voltage Gain

  17. Input Resistance

  18. Output Resistance To find the output resistance of an amplifier, we disconnect the load, replace the signal source by its internal resistance, and then find the resistance looking into the output terminals.

  19. SOURCE FOLLOWERS

  20. The Small-Signal Equivalent Circuit

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