Question

A 4-bit successive approximation type of A\D converter has an input range of 0 to 15 volts. The output bit $b_1$ next to the LSB has a stuck-at-zero fault. The pair of input voltages, that produces the same output code word is

Answer 1

Fault is $\to b_3{b}_2{b}_1{b}_0$
Resolution $=\frac{15}{2^4-1}=\frac{15}{16-1}=1V$
for input $V_i=2V$
for input $V_i=1V$