1. What is the ideal reconstruction formula or ideal interpolation formula for x(t) = _________

a) \(\sum_{-\infty}^\infty x(nT) \frac{sin(π/T) (t-nT)}{(π/T)(t-nT)}\)

b) \(\sum_{-\infty}^\infty x(nT) \frac{sin(π/T) (t+nT)}{π/T)(t+nT}\)

c) \(\sum_{-\infty}^\infty x(nT) \frac{sin(2π/T) (t-nT)}{2π/T)(t-nT}\)

d) \(\sum_{-\infty}^\infty x(nT) \frac{sin(4π/T) (t-nT)}{(4π/T)(t-nT)}\)

2. What is the new ideal interpolation formula described after few problems with previous one?

a) g(t)=\(\frac{sin(2πt/T)}{(πt/T)}\)

b) g(t)=\(\frac{sin(πt/T)}{(πt/T)}\)

c) g(t)=\(\frac{sin(6 πt/T)}{(πt/T)}\)

d) g(t)=\(\frac{sin(3 πt/T)}{(πt/T)}\)

3. What is the frequency response of the analog filter corresponding to the ideal interpolator?

a) H(F)=\(\begin{cases}T, |F|≤ \frac{1}{2T} = F_s/2\\0,|F| > \frac{1}{4T}\end{cases}\)

b) H(F)=\(\begin{cases}T, |F|≥ \frac{1}{2T} = F_s/2\\0,|F| > \frac{1}{4T}\end{cases}\)

c) H(F)=\(\begin{cases}T, |F|≤ \frac{1}{2T} = F_s/2\\0,|F| > \frac{1}{2T}\end{cases}\)

d) H(F)=\(\begin{cases}T, |F|≤ \frac{1}{4T} = F_s/2\\0,|F| > \frac{1}{4T}\end{cases}\)

4. The reconstruction of the signal from its samples as a linear filtering process in which a discrete-time sequence of short pulses (ideally impulses) with amplitudes equal to the signal samples, excites an analog filter.

a) True

b) False

5. The ideal reconstruction filter is an ideal low pass filter and its impulse response extends for all time.

a) True

b) False

6. D/A conversion is usually performed by combining a D/A converter with a sample-and-hold (S/H ) and followed by a low pass (smoothing) filter.

a) True

b) False

7. The time required for the output of the D/A converter to reach and remain within a given fraction of the final value, after application of the input codeword is called?

a) Converting time

b) Setting time

c) Both Converting & Setting time

d) None of the mentioned

8. In the D/A converter, the application of the input codeword results in a high-amplitude transient, called?

a) Glitch

b) Deglitch

c) Glitter

d) None of the mentioned

9. In a D/A converter, the usual way to solve the glitch is to use deglitcher. How is the Deglitcher designed?

a) By using a low pass filter

b) By using a S/H circuit

c) By using a low pass filter & S/H circuit

d) None of the mentioned

10. What is the impulse response of an S/H, when viewed as a linear filter?

a) h(t)=\(\begin{cases}1,0≤t≤T\\0,otherwise\end{cases}\)

b) h(t)=\(\begin{cases}1,0≥t≥T\\0,otherwise\end{cases}\)

c) h(t)=\(\begin{cases}1,0<t≤T\\0,otherwise\end{cases}\)

d) None of the mentioned

11. A good Sample and Hold circuit should have

- High input impedance
- Low output impedance
- Both 1 and 2
- None of the above

12. Sample-and-hold circuits in ADCs are designed to

13. When a time-varying signal has to be digitized using an ADC, which of the following is necessary to use before digitization?

14. For a given sample-and-hold circuit, if the value of the hold capacitor is increased, then

15. Increase the order of data hold will

16. A signal channel signal acquisition system with 0-10 V range consists of a sample and hold circuit with a worst-case drop rate of 100 μV/ms and 10 bit ADC. The maximum conversion time for the ADC is