Discussion
Which of the following is not a way to raise a stage's input impedance?
Bypassing the emitter resistor
Unbypassing the emitter resistor
Bootstrapping the bias divider
Reducing the operating current
Answer: D
Bypassing the emitter resistor lowers the input impedance, because it removes the resistance that was being reflected to the base - the reflected quantity falls to the intrinsic value alone. The other three all raise it. That the same component raises or lowers a specification depending on whether a capacitor is fitted across it is worth pausing over, since it is the commonest source of confusion in reading these stages. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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