Electronic Devices 9th Edition Chapter 8: Field Effect Transistors
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Questions and Answers

What is the primary function of a reverse-biased pn junction in a JFET?

  • To amplify the input signal
  • To reduce the input impedance
  • To increase the output voltage
  • To control current in a channel (correct)

    • What is the difference between an n-channel and a p-channel JFET?

  • The direction of current flow
  • The structure of the device (correct)
  • The number of terminals
  • The type of material used in the construction

    • What are the three terminals of an n-channel JFET?

  • Collector, base, and emitter
  • Drain, gate, and collector
  • Drain, base, and emitter
  • Drain, gate, and source (correct)

    • What is the purpose of the p-type regions in an n-channel JFET?

    <p>To form a channel</p> Signup and view all the answers

    What is the function of the gate lead in a JFET?

    <p>To connect the two p-type regions</p> Signup and view all the answers

    What is the difference between a JFET and a BJT?

    <p>The operating principle</p> Signup and view all the answers

    What is IDSS in the context of JFETs?

    <p>The maximum drain current that a JFET can produce regardless of the external circuit</p> Signup and view all the answers

    What happens to a JFET when it reaches breakdown?

    <p>It can result in irreversible damage to the device</p> Signup and view all the answers

    What is the effect of increasing the magnitude of VGS to larger negative values on the drain current?

    <p>It decreases the drain current</p> Signup and view all the answers

    What is the region of operation where the JFET produces a constant current?

    <p>Active region</p> Signup and view all the answers

    What is the purpose of applying a reverse-bias voltage, VGG, from gate to source?

    <p>To produce a family of drain characteristic curves</p> Signup and view all the answers

    What is the term for the point where the drain current becomes constant?

    <p>Pinch-off</p> Signup and view all the answers

    What is the primary purpose of determining ID in a JFET amplifier?

    <p>To calculate the Q-point of an amplifier</p> Signup and view all the answers

    What is the graphical approach used to find ID based on?

    <p>The transfer characteristic curve</p> Signup and view all the answers

    Why are capacitors removed from the circuit in the DC analysis?

    <p>Because they are open to DC</p> Signup and view all the answers

    What is the assumption made about the voltage source in the AC equivalent circuit?

    <p>It has a zero internal resistance</p> Signup and view all the answers

    What is the AC equivalent circuit based on?

    <p>The assumption that XC &gt; 0 at the signal frequency</p> Signup and view all the answers

    What is the AC potential of the VDD terminal in the AC equivalent circuit?

    <p>A zero-volt potential</p> Signup and view all the answers

    What is the main purpose of RG in amplifier applications?

    <p>To isolate an ac signal from ground and force the gate to be at 0 V</p> Signup and view all the answers

    What is the relationship between IS and ID in a JFET?

    <p>IS is equal to ID</p> Signup and view all the answers

    What is the effect of the current through RS on the source of a p-channel JFET?

    <p>It produces a negative voltage at the source</p> Signup and view all the answers

    How is the drain voltage with respect to ground determined in a JFET?

    <p>By setting the Q-Point of the JFET</p> Signup and view all the answers

    What is the purpose of setting the Q-Point of a JFET?

    <p>To establish a JFET bias point</p> Signup and view all the answers

    What is the relationship between VG and VS in an n-channel JFET?

    <p>VG is 0, and VS is positive with respect to ground</p> Signup and view all the answers

    What is the characteristic of the input resistance to a JFET?

    <p>High</p> Signup and view all the answers

    What is the condition required for the expression of JFET voltage gain in Equation 9-1 to be applicable?

    <p>Source terminal at ac ground</p> Signup and view all the answers

    What is the primary contributor to the voltage at the gate in the circuit shown in Figure 9-8(b)?

    <p>Input voltage from the signal source</p> Signup and view all the answers

    What is the purpose of the ac voltage source in the circuit shown in Figure 9-8(b)?

    <p>To provide an ac signal to the input</p> Signup and view all the answers

    What is the configuration of the amplifier being discussed in the context of Equation 9-1?

    <p>Common-source amplifier</p> Signup and view all the answers

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