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What generally happens to a stage's response when its load becomes capacitive?

  • A.The low-frequency break falls as well
  • B.The phase shift reduces at the band edge
  • C.The high-frequency break falls
  • D.The gain rises across the whole passband

Answer: C

A capacitive load works against the collector resistance to form an additional shunt time constant, so the break falls and the bandwidth narrows. Gain in the passband is unchanged, the low end is unaffected, and the phase shift increases rather than reducing. Since a capacitive load is the normal case - the next stage's input, a cable, a probe - a stage's bandwidth should always be quoted with the load it was measured into.

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