Transcription of Chapter 9: FET Amplifiers And Switching Circuits
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Chapter 9: FET Amplifiers And Switching Circuits
1 Chapter 9: FET Amplifiers And Switching Circuits9-1: The Common Source Amplifier (CS Amplifier)FET has an important advantage compared to the BJT due to the FET sextremely high input impedance. Disadvantages, however, include higher distortion and lower gain. The common-source (CS) amplifier iscomparable to the common-emitter BJT amplifier that you studied in Chapter AC Model: the ac model for FET is shown belowresistance source-to-drain internal theissource anddrain between appear current theis g resistance internal source gate theis 'm'dsgsgsrVrSince is very large and is also large they can be neglected Simplified model29-1: The Common Source AmplifierFET AC ModelAn ideal ac circuit model with ac drain resistance Rdcan be represented as shown.
FET has an important advantage compared to the BJT due to the FET’s extremely high input impedance. Disadvantages, however, include higher distortion and lower gain. The common-source (CS) amplifier iscomparable to the common-emitter BJT amplifier that you studied in Chapter 6. FET AC Model: the ac model for FET is shown below
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