A multiplying DAC is given a reference voltage VR = Vom cos2πft. Determine the output voltage?

A multiplying DAC is given a reference voltage VR = Vom cos2πft. Determine the output voltage? Correct Answer Vo(t) = Vom cos(2πft+180o)

Vo(t) = Vom cos2πft+180o. The 180ophase shift is added, since the VR is connected to inverting input terminal and Vom = 0v to (1-2-n)×Vim depends on the input code.
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