Name:

  1. What type of amplifier does this diagram show?

    MOSFET Amplifiers

     
  2. Each separate MOSFET above, is connected in a standard circuit configuration. What is this configuration called?



     
  3. The amplifier in the diagram above will suffer from serious distortion.

    A) What is this distortion called?


    B) What causes it?

     
  4. What approximate voltage is needed to start turning on the MOSFETs in the diagram above?



     
  5. On the diagram below, sketch a graph showing cross-over distortion where the wave shown is the input signal.

    Sine Wave

  6. On the diagram below ...

    A) sketch a graph showing limiting/clipping distortion where the wave shown is the input wave.

    B) What causes this type of distortion?

    Sine Wave

     
  7. In the diagram below, three resistors are used.

    MOSFET Biasing

    A) What is the name of the module comprising the three resistors.


    B) Explain how this circuit reduces cross-over distortion.


    C) What is the technical name for applying DC voltages to devices to ensure they opperate correctly?

     
  8. In the circuit above, what happens to the MOSFETs if Rv is too big? Explain your answer.



     
  9. If the the circuit above is to be used for audio amplification, why are the capacitors needed?



     
  10. The circuit below reduces cross-over distortion. Explain how this works.

    Negative Feedback
     
  11. The circuit above might oscillate at a high frequency. What causes this?



  12. A push pull MOSFET amplifier uses a power supply providing +50V and -50V.

    A) What will be the highest and lowest possible undistorded peak output voltages ?


    B) What will the maximum RMS output voltage be?


    C) If this output is driving a 4 ohm loudspeaker load, what will the RMS output power be?