Bissoy.com
Doctors Medicines MCQs Q&A

When a large number of analog signals is to be converted to digital form, an analog multiplexer is used. The A-to-D converter most suitable in this case will be

When a large number of analog signals is to be converted to digital form, an analog multiplexer is used. The A-to-D converter most suitable in this case will be Correct Answer Successive approximation type

The conversion time of successive approximation ADC is less than forward counter type, up-down counter, or dual-slope ADC. Hence option 3 is correct.

[ alt="26 June 1" src="//storage.googleapis.com/tb-img/production/19/08/26%20June_1.png" style="width: 160px; height: 46px;">

Successive approximation A/D converter:

Successive approximate Analog to Digital converter is as given below

[ alt="adcdac" src="//storage.googleapis.com/tb-img/production/18/07/adcdac.PNG" style="height: 242px; width: 468px;">

  • It contains a Comparator, a DAC and a successive approximation register.
  • The basic principle is that binary regression, in which analog input is compared with DAC reference voltage which is repeatedly divided in half.
  • A successive approximation A/D converter consists of a comparator, a successive approximation register (SAR), output latches, and a D/A converter.
  • It is capable of high speed and is reliable.

Dual-slope converter:

  • In the dual-slope technique, an integrator is used to integrate an accurate voltage reference for a fixed period of time. The same integrator is then used to integrate with the reverse slope, the input voltage, and the time required to return to the starting voltage is measured.
  • The automatic zero correction function is performed before each conversion so that changes in the offset voltages & current will be compensated.

 

 

[ alt="F1 U.B 3.7.20 Pallavi D10" src="//storage.googleapis.com/tb-img/production/20/07/F1_U.B_3.7.20_Pallavi_D10.png" style="width: 578px; height: 338px;">

Ramp-type:

  • The principle of Ramp-type DVM is based on the measurement of the time it takes for a linear ramp voltage to rise from 0 V to the level of the input voltage (or) to decrease from the level of the input voltage to zero.
  • This type of Analogue to Digital Converter is very slow (but cheap and simple).
  • It is ideal for data that changes fairly slowly such as vehicle or aircraft control systems.

  • Audio signals are slow enough to be converted

 

For n-bit conversion, the conversion time for different ADC are:

Counter type ADC: (2n – 1) Tclk

Successive approx. time ADC: n Tclk

Flash type ADC: Tclk

Dual slope ADC: (2n+1 – 1) Tclk

The successive approximation A/D converter has a shorter conversion time compared to the counter ramp A/D converter.

Related Questions

Read the following passage and answer the item that follows. Your answers to this item should be based on the passage only. We live in digital times. The digital is not just something we use strategically and specifically to do a few tasks. Our very perception of who we are, how we connect to the world around us, and the ways in which we define our domains of life, labour and language are hugely structured by the digital technologies. The digital is everywhere and, like air, invisible. We live within digital systems, we live with intimate gadgets, we interact through digital media, and the very presence and imagination of the digital has dramatically restructured our lives. The digital, far from being a tool, is a condition and context that defines the shapes and boundaries of our understanding of the self, the society, and the structure of governance. Which among the following is the most logical and essential message conveyed by the above passage?
A 4 × 1 multiplexer with two selector lines is used to realize a Boolean function F having four Boolean variables X, Y, Z and W as shown below. S0 and S1 denote the least significant bit (LSB) and most significant bit (MSB) of the selector lines of the multiplexer respectively. I0, I1, I2, I3 are the input lines of the multiplexer. The canonical sum of product representation of F is
What is the LSB voltage of a analog to digital converter if the full scale voltage range is 16 volt and the resolution of analog to digital converter in bits is 2?
What is the full scale voltage range of a analog to digital converter if the LSB voltage is 4 volt and the resolution of analog to digital converter in bits 3?
What is the resolution of a analog to digital converter if the full scale voltage range is 16 volt and the resolution of analog to digital converter in bits 2?
What is the LSB voltage of a analog to digital converter if the full scale voltage range is 8 volt and the resolution of analog to digital converter in bits 2?
What is the resolution of a analog to digital converter if the full scale voltage range is 8 volt and the resolution of analog to digital converter in bits 2?
What is the resolution of a analog to digital converter if the full scale voltage range is 10 volt and the resolution of analog to digital converter in bits 2?
The question given below consists of a statement, followed by three arguments numbered I, II and III. You have to decide which of the arguments is/are ‘strong’ arguments and which is/are ‘weak’ arguments and accordingly choose your answer from the alternatives given below each question. Statement: In an interview with ETCIO.COM, Kuruvilla Markose, Chief Digital Officer of Titan shares his perspective on how technology is serving the company’s digital vision and the various initiatives that he is spearheading to hone the competitive edge of Titan. He is the first CDO to be appointed by the software conglomerate Tata Group. He is the man who has put the Titan’s digital transformation on fast-track. Which of the following arguments support the fact that Kuruvilla Markose has put Titan’s digital transformation on fast-track? Arguments: I. Markose is a man with a vision. He is the first CDO to be appointed by the software conglomerate Tata Group. He has spent his entire two decade long career in Tata Group. He has been in customer facing roles across different group companies.  II. His CDO role is horizontal and supports Titan’s myriad business lines: watches, jewellery, bags, perfumes wallets, and eye-wear. But the man and his words are grounded. Diny, as he is popularly known, is a man of measured speech and bearing. III. “Digital innovation”, according to Markose, is all about creating value for the customer. To him, customer centricity is the road to longevity in the digital age. Under his stewardship, Titan has launched a panoply of digital initiatives aimed at improving customer centricity.
A government official said, “Currently, the traffic signals installed along the roads have a fixed signal timer but with the Japanese technology, signals will automatically change according to the number of vehicles along the road.” Which of the following could be the reason for the statement? I: The installation of smart signals will reduce the waiting time at signals and junctions. II: The installation of smart signals will solve the traffic woes in the city. III: The technology will be an integrated traffic management center that will ease congestion in the city.