4–94 A five-bit flash ADC in Figure P4–94 uses a reference voltage of 5 V. Find the output code for the analog inputs vS = 3:5V, 2:3 V, and 4:9 V. If the reference voltage is changed to 8 V, which of these codes would change?

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VREF VS I R VNI R VN2 w R ww VN3 R VN4 R VN5 ww ww R FIGURE P4-94 +/ +/ +/ -ob b obz ob obs