Unit 2: AM Reception in Analog Communication - SY(E&TC) AY 2023-24
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What is the main purpose of the AGC (Automatic Gain Control) circuit in a superheterodyne receiver?

  • To recover the original modulating signal from the highly amplified IF signal
  • To increase the voltage and power of the recovered signal for driving a speaker
  • To maintain a constant output voltage level over a wide range of RF input signal levels (correct)
  • To automatically adjust the tuning of the RF amplifier to match the incoming signal frequency

    • How does the AGC circuit work to maintain a constant output voltage level?

  • The AGC circuit rectifies and filters the recovered signal to produce a DC voltage, which is then fed back to the IF and RF amplifiers to control their gain (correct)
  • The AGC circuit monitors the frequency of the incoming signal and tunes the RF amplifier to match it, maintaining a constant output level
  • The AGC circuit measures the power of the output signal and adjusts the gain of the audio and power amplifiers accordingly
  • The AGC circuit uses a feedback loop to increase the gain of the receiver when the input signal is weak, and decrease the gain when the input signal is strong

    • What is the purpose of the RF (Radio Frequency) amplifier in a superheterodyne receiver?

  • To increase the voltage and power of the recovered signal for driving a speaker
  • To amplify the incoming RF signal before it is mixed with the local oscillator signal (correct)
  • To filter out unwanted frequencies from the incoming RF signal before it is mixed
  • To recover the original modulating signal from the highly amplified IF signal

    • What is the role of the IF (Intermediate Frequency) amplifier in a superheterodyne receiver?

    <p>To provide high gain amplification to the frequency-converted IF signal</p> Signup and view all the answers

    How does the AGC circuit prevent distortion in a superheterodyne receiver?

    <p>By reducing the gain of the IF amplifiers when a high-amplitude input signal is present, preventing overload and distortion</p> Signup and view all the answers

    What is the purpose of the local oscillator in a superheterodyne receiver?

    <p>To generate a fixed-frequency signal that is mixed with the incoming RF signal to produce the intermediate frequency (IF)</p> Signup and view all the answers

    How does the RF amplifier in a superheterodyne receiver help to improve the overall performance of the receiver?

    <p>By amplifying the incoming RF signal before it is mixed with the local oscillator signal, improving the signal-to-noise ratio and sensitivity of the receiver</p> Signup and view all the answers

    What is the role of the detector circuit in a superheterodyne receiver?

    <p>To recover the original modulating signal from the highly amplified IF signal</p> Signup and view all the answers

    How does the AGC circuit help to maintain the dynamic range of a superheterodyne receiver?

    <p>By reducing the gain of the IF amplifiers when a high-amplitude input signal is present, and increasing the gain when the input signal is weak, maintaining a constant output level</p> Signup and view all the answers

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