Question
Download Solution PDFThe various components in superheterodyne receiver is arranged as :
(i) AM Detector
(ii) Mixer
(iii) RF Amplifier
(iv) AF Amplifier
The correct sequence is :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Superheterodyne Receiver
Definition: A superheterodyne receiver is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency. This design allows for better selectivity and sensitivity compared to other types of receivers.
Working Principle: In a superheterodyne receiver, the incoming radio frequency (RF) signal is first passed through a Radio Frequency (RF) amplifier to increase its strength. It is then mixed with a signal from a local oscillator in the mixer stage to produce an intermediate frequency (IF). The IF signal is then amplified and processed to extract the audio or data information. Finally, the detected signal is amplified by the Audio Frequency (AF) amplifier to drive the output device, such as a speaker or headphones.
Components and Their Functions:
- RF Amplifier: Amplifies the received RF signal to improve the signal-to-noise ratio before it is fed into the mixer.
- Mixer: Combines the amplified RF signal with a signal from the local oscillator to produce the intermediate frequency (IF) signal.
- IF Amplifier: Amplifies the IF signal to a level suitable for further processing.
- AM Detector: Demodulates the IF signal to extract the audio or data information from the carrier wave.
- AF Amplifier: Amplifies the detected audio signal to a level sufficient to drive the output device, such as a speaker or headphones.
Correct Option Analysis:
The correct sequence of the components in a superheterodyne receiver is:
Option 1: (iii) RF Amplifier, (ii) Mixer, (i) AM Detector, (iv) AF Amplifier
This sequence correctly represents the arrangement of components in a superheterodyne receiver. The RF amplifier first amplifies the incoming signal, which is then mixed to produce an IF signal. The IF signal is demodulated by the AM detector, and the resulting audio signal is finally amplified by the AF amplifier
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