GATE EE 2015 Set 1 — Question 50
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Analog & Digital Electronics → Data Conversion Circuits → A/D Converters (Flash, SAR)
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Question
An 8-bit, unipolar Successive Approximation Register type ADC is used to convert 3.5 V to digital equivalent output. The reference voltage is +5 V. The output of the ADC, at the end of 3rd clock pulse after the start of conversion, is
Correct answer
(A) 1010 0000
Solution
In an 8-bit SAR ADC with , the conversion process proceeds bit by bit from MSB to LSB.
1.Clock Pulse 1: The MSB () is set to 1. The DAC output is . Since , remains 1. Current state: .
2.Clock Pulse 2: The next bit () is set to 1. The DAC output is . Since , is reset to 0. Current state: .
3.Clock Pulse 3: The next bit () is set to 1. The DAC output is . Since , remains 1. Current state: .
At the end of the 3rd clock pulse, the output is .Continue learning with Success Tracker
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