Discussion
Consider the following pairs of change and its effect on a common-emitter stage.
Unbypassing the emitter resistor - Gain falls, input impedance rises
Loading the collector - Gain falls
Raising the operating current - Gain rises for a fixed collector resistor
Stiffening the bias divider - Input impedance rises
How many of the pairs given above are correctly matched?
Answer: B
The first three are correctly paired and the fourth is not, so three match. A stiffer divider is a lower resistance in parallel with the input, so it lowers the input impedance rather than raising it. Each of these changes moves two specifications at once, and being able to name both directions is what turns a list of formulae into a working feel for the circuit.
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