Consider this 3-bit digital to analog converter. We define the logic state of ea

Question

Consider this 3-bit digital to analog converter. We define the logic state of each switch as 0 or 1, where 0 means not pushed and 1 means pushed. Define a 3-bit number n (0 to 7) which specifies the three switch positions. n = 0 means none are pushed. n = 1 means Sw0 is pushed. n = 2 means Sw1 is pushed. n = 3 means Sw1 and Sw0 are pushed. n = 4 means Sw2 is pushed. n = 5 means Sw2 and Sw0 are pushed. n = 6 means Sw2 and Sw1 are pushed. n = 7 means all are pushed. Derive a relationship between the current I and the number n.

Multiple choice

a) I = 0

b) I = n*20mA

c) I = n2+10mA

d) I = 140 mA

e) none of the above

Explanation / Answer

answer is option b) ie I=n*20mA

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