GATE EC 2025 Set 1 — Question 35
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Digital Circuits → Data Converters → DAC (Weighted, R-2R)
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Question
A 4-bit weighted-resistor DAC with inputs and (MSB to LSB) is designed using an ideal opamp, as shown below. The switches are closed when the corresponding input bits are logic '1' and open otherwise.When the input changes from to , the magnitude of the change in the output voltage (in mV, rounded off to the nearest integer) is ________.
Correct answer
250 to 250
Solution
The output voltage of the weighted-resistor DAC is . Here and V. For input , V. For input , V. The magnitude of change is V = mV.
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