Question:
Which of the following is used to correct the aperture effect due to flat-top sampling in the sample-and-hold circuit of PAM demodulation?
Which of the following is used to correct the aperture effect due to flat-top sampling in the sample-and-hold circuit of PAM demodulation?
Show Hint
Flat-top sampling introduces a sinc-type attenuation.
An equalizer is used to compensate for the resulting aperture distortion.
Updated On: Jun 25, 2026
- Amplifier
- Low pass filter
- Band pass filter
- Equalizer
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The Correct Option is D
Solution and Explanation
Concept:
In practical PAM systems, flat-top sampling is achieved using a sample-and-hold circuit.
Due to the finite pulse width of the sampling pulse, the sampled spectrum gets multiplied by a sinc function.
This introduces amplitude distortion known as the aperture effect.
\[
H(f)=\frac{\sin(\pi f\tau)}{\pi f\tau}
\]
where \(\tau\) is the pulse width.
Step 1: Understand the aperture effect.
The sinc response attenuates higher-frequency components more than lower-frequency components. Hence the reconstructed signal suffers from frequency-dependent distortion.
Step 2: Determine the corrective device.
To compensate for this non-uniform frequency response, a network having the inverse characteristic is employed. Such a compensating network is called an equalizer.
Step 3: Select the correct option.
Therefore, aperture effect is corrected using \[ \boxed{\text{Equalizer}} \] Hence, \[ \boxed{\text{Correct Option (D)}} \]
Step 1: Understand the aperture effect.
The sinc response attenuates higher-frequency components more than lower-frequency components. Hence the reconstructed signal suffers from frequency-dependent distortion.
Step 2: Determine the corrective device.
To compensate for this non-uniform frequency response, a network having the inverse characteristic is employed. Such a compensating network is called an equalizer.
Step 3: Select the correct option.
Therefore, aperture effect is corrected using \[ \boxed{\text{Equalizer}} \] Hence, \[ \boxed{\text{Correct Option (D)}} \]
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