Question
Which parameter affects receiver sensitivity?
Answer Options
- A) Input amplifier gain
- B) Demodulator stage bandwidth
- C) Input amplifier noise figure
- D) All these choices are correct
Correct Answer: C
Explanation
Receiver sensitivity is a measure of the weakest input signal that the receiver can still detect and successfully demodulate. The most critical factor determining sensitivity is the noise introduced by the very first stage of amplification.
Therefore, the primary parameter that affects receiver sensitivity is the input amplifier noise figure. The noise figure quantifies the amount of additional noise introduced by the amplifier itself. A lower noise figure means the amplifier adds less noise, allowing the receiver to resolve weaker signals above the noise floor, resulting in better sensitivity.
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