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Which of among the following circuit is considered to be linear?

Which of among the following circuit is considered to be linear? Correct Answer Inverter R-2R ladder DAC

Current remain constant in each branch of ladder in inverted R-2R ladder DAC. So, the constant current implies constant voltage. The ladder mode voltage remain constant even when the input data changes. So, inverter R-2R ladder DAC is considered to be linear.

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