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A rectifier and an envelope detector for AM uses
  • a)
    opamps for rectification and zener diodes for storing the peaks
  • b)
    diodes for rectification and capacitors for storing the peaks
  • c)
    transistors for rectification and zener diodes for storing the peaks
  • d)
    none of these
Correct answer is option 'B'. Can you explain this answer?
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A rectifier and an envelope detector for AM usesa)opamps for rectifica...
Rectifier and Envelope Detector for AM

Rectification and envelope detection are the basic functions of an AM receiver. Rectification is the process of converting the AC signal to DC, and envelope detection is the process of extracting the modulating signal from the amplitude modulated signal.

Diodes and Capacitors for Rectification and Envelope Detection

The most commonly used components for rectification and envelope detection are diodes and capacitors. The diodes are connected in series with the signal, and they allow only the positive half cycles of the signal to pass while blocking the negative half cycles. The output of the diode is a pulsating DC signal.

The capacitor is connected across the output of the diode, and it filters out the high-frequency components of the pulsating DC signal, leaving only the low-frequency modulating signal. The output of the capacitor is the envelope of the AM signal.

Advantages of Diodes and Capacitors

The diodes and capacitors are simple and inexpensive components that are readily available. They are also highly reliable and have a long operating life. Moreover, they are easy to use and require no external power source.

Conclusion

In conclusion, diodes and capacitors are the preferred components for rectification and envelope detection in an AM receiver. They provide a simple and reliable solution for extracting the modulating signal from the amplitude modulated carrier signal.
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