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Analog and Digital Converters - Technical MCQs

Q1:

A binary-weighted digital-to-analog converter has a feedback resistor, Rf, of 12 komega.gif. If 50 mu.gifA of current is through the resistor, the voltage out of the circuit is:

A 0.6 V

B –0.6 V

C 0.1 V

D –0.1 V

ANS:B - –0.6 V

V=I*R.
V=(50 * 10^-6) * (12 * 10^3),
V=600 * 10^-3 =>0.6 V,
V= -0.6 V (-ve sign indicates the Negative feedback resistor).