Discussion
Assertion (A): Assertion: A larger emitter resistor always improves an amplifier.
Reason (R): Reason: It increases the negative feedback acting on the operating point.
Select the correct answer from the options below.
Answer: B
The reason is true but the assertion is false: the improved stability is paid for in supply voltage and hence in output swing, and beyond a point the stage cannot deliver the required output at all. A rule of thumb of about a tenth of the supply reflects that balance. A statement containing the word always is worth testing against the cost side of the trade, because most component values have one.
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