Which sampling principle is used in flat top sampling?

Which sampling principle is used in flat top sampling?

Flat top sampling makes use of sample and hold circuit.

What is the output of sampling?

The quantity ½ cycles/sample × fs samples/sec = fs/2 cycles/sec (hertz) is known as the Nyquist frequency of the sampler. Therefore, s(t) is usually the output of a low-pass filter, functionally known as an anti-aliasing filter.

What is the difference between flat top sampling and natural sampling?

The difference between natural sampling and flat top sampling is that: In natural sampling the analog input is multiplied by a train of uniformly spaced, rectangular pulses. While in flat top sampling the top of the samples are flat, this means they have a constant amplitude.

What is the difference between natural Pam and Flat Top Pam?

In natural PAM, a signal sampled at Nyquist rate can be reconstructed, by passing it through an efficient Low Pass Filter (LPF) with exact cutoff frequency. Though the PAM signal is passed through a LPF, it cannot recover the signal without distortion. Hence, to avoid this noise, use flat-top sampling.

Why Is Flat Top sampling preferred?

In flat top sampling the top of samples are constant and are equal to instantaneous value of the signal while a more practical method of sampling is natural sampling in which the width of pulse is finite.

How does Flat Top sampling leads to aperture effect distortion?

The amplitude of the flat top signal must be constant, but sometimes it is not constant due to the high frequency roll off of the sampling signal. Thus the sampled signal in the flat top sampling consists of attenuated high frequency components and this effect is known as Aperture effect.

Why Is Flat Top sampling more preferred than natural sampling?

With the help of hold and sample circuit ‘flat top sampling’ is done. In flat top sampling the top of samples are constant and are equal to instantaneous value of the signal while a more practical method of sampling is natural sampling in which the width of pulse is finite.

What is the disadvantage of Flat Top sampling?

What is the main disadvantage of Flat top sampling? The sampling rate is large in proportion with f. This has practical limitations. The sampled signal spectrum has spectral gaps.

Why Flat Top PAM is preferred over natural PAM?

Here is your answer. ✔For the generation of a PAM signal we use a flat top type PAM scheme because during the transmission, ✔The noise is interfered at top of the transmission pulse which can be easily removed if the PAM pulse in flat top. ✔In natural top scheme this is not possible.

What are the disadvantages of PAM?

Following are the disadvantages of PAM: ➨Noise interference is higher. ➨It is difficult to remove noise, as this will affect amplitude part which carries information. ➨It has lowest power efficiency among all three types.

What are the advantages of flat top sampling over other types of sampling?

How does flat top sampling get the sampled signal?

Flat top sampling makes use of sample and hold circuit. Theoretically, the sampled signal can be obtained by convolution of rectangular pulse p (t) with ideally sampled signal say y δ (t) as shown in the diagram: i.e. y ( t) = p ( t) × y δ ( t)…… ( 1) To get the sampled spectrum, consider Fourier transform on both sides for equation 1

Which is the waveform of the sampling function?

Since the width of the pulse approaches zero, the instantaneous sampling gives a train of impulses of height equal to the instantaneous value of the input signal x (t) at the sampling instant. This is known as sampling function and its waveform is shown in fig.1 (b).

Which is the input signal in the sampling process?

As per the scientist’s name, Harry Nyquist this is named as Nyquist sampling theorem. The sampling process requires two input signals. The first input signal is an analog signal and another input is sampling pulse or equidistance pulse train signal. And the output which is then sampled signal comes from the multiplier block.

What are the different types of sampling techniques?

There are three types of sampling techniques: Impulse sampling. Natural sampling. Flat Top sampling.