Electronics and Communication Engineering - Radio Receivers - Discussion

Discussion Forum : Radio Receivers - Section 2 (Q.No. 2)
2.
A low ratio of the A.C. load impedance of a diode detector results in
diagonal clipping
poor AGC operation
poor AF response
negative peak clipping
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
1 comments Page 1 of 1.

S Prabhakar said:   2 months ago
The AC to DC load impedance ratio of a diode detector refers to the ratio between the impedance of the alternating current (AC) signal and the direct current (DC) load. This ratio is important because it affects the performance of the diode detector.

Poor AGC Operation: AGC stands for Automatic Gain Control, which is a feature that adjusts the gain of an amplifier to maintain a consistent output level. If the ratio of AC to DC load impedance is low, the AC impedance is much smaller than the DC load impedance. This can result in poor AGC operation because the diode detector may not be able to properly detect and respond to changes in the AC signal level.

Poor AF Response: AF stands for Audio Frequency, which refers to the range of frequencies audible to the human ear. A diode detector is often used in audio applications to demodulate amplitude-modulated (AM) signals. If the ratio of AC to DC load impedance is low, it can lead to poor AF response because the diode detector may not accurately reproduce the original audio signal. This can result in distortion or loss of fidelity in the demodulated audio.

Negative Peak Clipping: Peak clipping occurs when a portion of the waveform is cut off or clipped due to excessive signal amplitude. If the ratio of AC to DC load impedance is low, it can lead to negative peak clipping. Negative peak clipping refers to the clipping of the negative peaks of the waveform. This can result in distortion and loss of information in the demodulated signal.

Diagonal Clipping: Diagonal clipping is a type of distortion that occurs when both positive and negative peaks of the waveform are clipped. If the ratio of AC to DC load impedance is low, it can lead to diagonal clipping, where both the positive and negative peaks of the waveform are clipped. This can result in significant distortion and loss of information in the demodulated signal.

Post your comments here:

Your comments will be displayed after verification.