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What does bootstrapping exploit?

  • A.A component with no voltage across it draws no current
  • B.A capacitor's reactance falling with frequency
  • C.The reflection of an emitter impedance to the base
  • D.The cancellation of two equal and opposite phase shifts

Answer: A

If both ends of a resistor move together, no signal current flows in it and it is effectively absent from the signal path, however low its resistance. The capacitor merely couples the driving voltage, reflection is a different rule, and no phase cancellation is involved. Making a component invisible by removing the voltage across it rather than by increasing its value is an idea worth recognising, since it appears in current sources and active loads as well.

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