MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Software Defined Radio knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The principle behind Sigma-Delta ADC is oversampling. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Which of the following is not a characteristic of DAC? |
| A. | Linearity |
| B. | Level conversion |
| C. | Grounding |
| D. | Sample and hold circuit |
| Answer» E. | |
| 3. |
In Nyquist sampling, the ____ frequency is ______to the duration of the observation interval. |
| A. | maximum recoverable, proportional |
| B. | minimum resolvable, inversely proportional |
| C. | maximum recoverable, inversely proportional |
| D. | minimum resolvable, proportional |
| Answer» C. maximum recoverable, inversely proportional | |
| 4. |
Which of the following is not a characteristic of IC implementation of quadrature sampling ADC? |
| A. | Thermal difference is less than lumped components |
| B. | Matching of passive component on IC substrate is easy |
| C. | Matching of passive component on IC substrate is difficult |
| D. | Thermal difference among filters is not large |
| Answer» D. Thermal difference among filters is not large | |
| 5. |
____, ____ and ____ must be properly matched for effective representation of input signal in quadrature sampling. |
| A. | Modulators, signal paths, correlator |
| B. | Signal paths, modulators, zero crossing detector |
| C. | Low pass filters, zero crossing detector, correlator |
| D. | Low pass filters, modulators, signal paths |
| Answer» E. | |
| 6. |
Quadrature sampling uses ____ to ____ the bandwidth available for a particular sampling rate. |
| A. | integration, quadruple |
| B. | complex numbers, quadruple |
| C. | complex numbers, double |
| D. | integration, double |
| Answer» D. integration, double | |
| 7. |
Which of the following is untrue about Sigma-Delta ADC? |
| A. | f<sub>s</sub>>2f<sub>max</sub> |
| B. | Zero crossing detector consists of a sample and hold circuit |
| C. | Aperture jitter is minimized due to integration |
| D. | The integrating filter is preceded by a zero crossing detector |
| Answer» C. Aperture jitter is minimized due to integration | |
| 8. |
In non-monotonic filters, attenuation increases with frequency. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Which of the following expressions give the SNR at the output of ADC? |
| A. | SNR=6.02*B+1.76+10log(f<sub>s</sub>/2f<sub>max</sub>) |
| B. | SNR=6.02*B+1.76+10log(2f<sub>max</sub>/fs) |
| C. | SNR=12.04*B+1.76+10log(2f<sub>max</sub>/fs) |
| D. | SNR=6.02*B+1.76 |
| Answer» B. SNR=6.02*B+1.76+10log(2f<sub>max</sub>/fs) | |
| 10. |
Which of the following expressions give the relation between power and quantization step size (q)? |
| A. | p=q<sup>2</sup>/2R |
| B. | p=q/2R |
| C. | p=q<sup>2</sup>/R |
| D. | p=q<sup>2</sup>*2R |
| Answer» B. p=q/2R | |
| 11. |
Which among the following filters has the slowest roll-off? |
| A. | Cauer |
| B. | Chebychev |
| C. | Butterworth |
| D. | Bessel |
| Answer» E. | |
| 12. |
The shape factor of an anti-aliasing filter is given by the ratio of the frequency at ___ dB attenuation point to the frequency at ___ dB point. |
| A. | 80, 3 |
| B. | 3, 80 |
| C. | -80, -3 |
| D. | -3, -80 |
| Answer» D. -3, -80 | |
| 13. |
To avoid aliasing, the wideband ADC is ____ by anti-aliasing filters to suitably alter the _____ waveform. |
| A. | succeeded, digital |
| B. | preceded, digital |
| C. | succeeded, analog |
| D. | preceded, analog |
| Answer» E. | |
| 14. |
Noise must be less than _____ of the ADC. |
| A. | half of the LSB |
| B. | LSB |
| C. | half of the MSB |
| D. | MSB |
| Answer» B. LSB | |
| 15. |
Which of the following is the first step in establishing acceptable aliasing power? |
| A. | Establish the relation between CIR and BER |
| B. | Fix BER threshold |
| C. | Convert BER threshold to CIR threshold |
| D. | Apply the instantaneous dynamic range requirement of ADC |
| Answer» C. Convert BER threshold to CIR threshold | |