A low ratio of the ac to the dc load impedance of a diode detector results in
A. Diagonal clipping
B. Poor AGC operation
C. Negative-peak clipping
D. Poor AF response
Answer: Option C
Solution(By Examveda Team)
Understanding Diode Detectors in Radio ReceiversDiode detectors are used in radio receivers to extract the audio signal from the radio frequency (RF) signal. They work by rectifying the RF signal, meaning they convert the alternating current (AC) signal into a direct current (DC) signal.
The detector's performance depends on the relationship between the AC load impedance (the impedance seen by the AC component of the signal) and the DC load impedance (the impedance seen by the DC component).
A low ratio of AC to DC load impedance means the AC impedance is much smaller than the DC impedance. This impacts how well the detector can handle the signal.
Imagine the detector trying to follow a quickly changing AC signal while also maintaining a steady DC level. If the AC impedance is too low, the detector struggles to accurately follow the rapid changes in the signal, which leads to distortion. The various options show different types of this distortion.
Therefore, a low ratio of AC to DC load impedance will cause negative-peak clipping. This is because the detector can't efficiently follow the negative portions of the AC signal, causing those portions to be "clipped" off. The other options, while possible problems in a radio receiver, aren't the direct result of a low AC-to-DC impedance ratio in the diode detector itself.
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