GATE EE 2016 Set 1 — Question 47
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Analog & Digital Electronics → Data Conversion Circuits → A/D Converters (Flash, SAR)
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Question
A 2-bit flash Analog to Digital Converter (ADC) is given below. The input is Volts. The expression for the LSB of the output as a Boolean function of , , and is
Correct answer
(A) X₀[X₂ ⊕ X₁]
Solution
In a flash ADC with and resistors , the reference voltages for the comparators are:
The comparator outputs are:
if
if
if The truth table for the output is:
.
The comparator outputs are:
if
if
if The truth table for the output is:
.
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