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Digital Electronics - Engineering

Q1:

A 6 bit DAC uses binary weighted resistors. If MSB resistor is 20 k ohm, the value of LSB resistor is

A 20 k ohm

B 80 k ohm

C 320 k ohm

D 640 k ohm

ANS:D - 640 k ohm

Resistances are R, 2R, 4R, 8R, 16R and 32R. LSB resistance = 32R = 32 x 20 = 640 K ohm.