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Interfacing to the Analog World

Q1:

If an analog signal is to be converted to an 8-bit resolution, how many comparators are used in a parallel-encoded ADC?

A 127

B 128

C 255

D 256

ANS:D - 256

For an N-bit converter, the circuit employs 2^N-1 comparators. A resistive-divider with 2^N resistors provides the reference voltage.



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