A 3-bit weighted resistor DAC shown in the figure has VR

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A 3-bit weighted resistor DAC shown in the figure has V_R = 2V and R₁/R = 2. For an input of 100, the output will be __________V

1. -2
2. -3
3. -6
4. -4

Correct Option: D

I_o = 2/R and E_o = – (2/R)
R_ƒ = – 2 × 2 = – 4V