Question

What will be the value of the output current io, if the digital signal is in the form of b1b2b3…bn

(a) Vref/2R (b1/2+   b2/4  + b3/8….+bn/(2^N))

(b) 2Vref/R (b1/2+   b2/4  + b3/8….+bn/(2^N))

(c) Vref/R (b1/2+   b2/4  + b3/8….+bn/(2^N))

(d) none of the above

This question was posed to me in a job interview.

My question is from Signals topic in division Signals and Amplifiers of Electronic Devices & Circuits

Answer 1

Right option is (c) Vref/R (b1/2+   b2/4  + b3/8….+bn/(2^N))

For explanation I would say: It is the total current that will flow individual resistances.