Which of the following is NOT an Analog-to-Digital Converter?a)Successive Approximation Converterb)Counter Typec)Dual Slope Converterd)R-2R LadderCorrect answer is option 'D'. Can you explain this answer? - EduRev Electrical Engineering (EE) Question

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Which of the following is NOT an Analog-to-Digital Converter?

a)
Successive Approximation Converter
b)
Counter Type
c)
Dual Slope Converter
d)
R-2R Ladder

Correct answer is option 'D'. Can you explain this answer?

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Which of the following is NOT an Analog-to-Digital Converter?a)Success...

Concept:

The common Analog to digital converters are:

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.

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.

Successive Approximation:

The basic principle is 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.

Important Points

R-2R ladder is used for Digital to Analog Converter:
It uses a summing amplifier with an R-2R ladder network as shown below.

For n-bit DAC, it requires only 2 different values of resistors i.e. R and 2R.

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