Technology Tradeoffs in Software Defined Radio MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Technology Tradeoffs in Software Defined Radio, a fundamental topic in the field of Cognitive Radio. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Technology Tradeoffs in Software Defined Radio MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Technology Tradeoffs in Software Defined Radio mcq questions that explore various aspects of Technology Tradeoffs in Software Defined Radio problems. Each MCQ is crafted to challenge your understanding of Technology Tradeoffs in Software Defined Radio principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Cognitive Radio tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Technology Tradeoffs in Software Defined Radio MCQs are your pathway to success in mastering this essential Cognitive Radio topic.

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Technology Tradeoffs in Software Defined Radio MCQs | Page 8 of 17

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Q71.
____, ____ 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

Discuss
Answer: (d).Low pass filters, modulators, signal paths Explanation:Low pass filters, modulators,and signal paths must be properly matched for effective representation of input signal in quadrature sampling. Amplitude mismatch, inconsistent time duration in filters may lead to degradation of complex signal.
Q72.
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

Discuss
Answer: (c).Matching of passive component on IC substrate is difficult Explanation:The integrated circuit implementation of quadrature sampling ADC is effective because of short signal paths, easy matching of passive components on IC substrate and low thermal difference among filters.
Q73.
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

Discuss
Answer: (b).minimum resolvable, inversely proportional Explanation:In Nyquist sampling, the maximum recoverable frequency is given by the expression fs/2. The minimum resolvable frequency is inversely proportional to the duration of the observation interval. The observation interval is given by the number of time domain points.
Q74.
Which of the following is not a characteristic of DAC?

a.

Linearity

b.

Level conversion

c.

Grounding

d.

Sample and hold circuit

Discuss
Answer: (d).Sample and hold circuit Explanation:DAC does not use sample and hold circuit. However it does make use of setup and hold circuit which is similar to sample and hold circuit. Linearity, level conversion, grounding, and isolation of digital from analog waveform are characteristics of a DAC.
Q75.
The principle behind Sigma-Delta ADC is oversampling.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True Explanation:It can be observed from the expression SNR=6.02*B+1.76+10log\((\frac{f_s}{2f_{max}})\), as the sampling frequency increases, SNR increases. This is the principle behind Sigma-Delta ADC. The amount of oversampling is given by the ratio of sampling frequency to Nyquist frequency.
Q76.
Which of the following is not a part of traditional RF subsystems?

a.

Filter

b.

Low noise amplifier

c.

Multiplexer

d.

Frequency translation

Discuss
Answer: (c).Multiplexer Explanation:The traditional RF subsystems comprise of preamplifier, low noise amplifier, filters, RF distribution, frequency translation, and filtering stages that convert RF signals to IF signals. Multiplexer is used in digital RF systems.
Q77.
Limited dynamic range in digital RF system can be improved by _____

a.

digital filter

b.

digital amplifier

c.

digital equalizer

d.

digital suppressor

Discuss
Answer: (a).digital filter Explanation:RF ADC has a high sampling rate and it oversamples the bandwidth of the signal. The oversampling gain increases the dynamic range with the help of digital integrating filters.
Q78.
____ and ____ are the parameters that define software defined radio applications.

a.

Linearity, SNR

b.

Dynamic range, SNR

c.

Linearity, Dynamic range

d.

Bandwidth, SNR

Discuss
Answer: (c).Linearity, Dynamic range Explanation:Linearity and Dynamic range are the parameters that define software defined radio applications. SNR is measured to determine the dynamic range. The SNR and DNR value is computed from the antenna to end user.
Q79.
Which of the following influences the spurious free dynamic range?

a.

Second-order intercept

b.

Second-order intermodulation product

c.

Third-order intercept

d.

Third-order intermodulation product

Discuss
Answer: (d).Third-order intermodulation product Explanation:The point at which the output noise level is tangential to the power of the third-order intermodulation product of ADC determines the spurious free dynamic range of ADC.
Q80.
The point of intersection of the fundamental signal with the power of third-order intermodulation product is called as _____

a.

input-referenced third-order intercept point

b.

output-referenced third-order intercept point

c.

input-referenced third-order intermodulation point

d.

output-reference third-order intermodulation point

Discuss
Answer: (a).input-referenced third-order intercept point Explanation:The increase in the third-order intermodulation product eventually results in the intersection of fundamental signal with the power of third-order intermodulation product. This is referred as input-reference third-order intercept point (IP3). The output power of the fundamental signal saturates before IP3.
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