Digital Signal Processing

Q1: In a 4-bit R/2R ladder digital-to-analog converter, because of negative feedback, the operational amplifier keeps the inverting (minus) input near ________.

A none of the above

B 5 volts

C zero volts

D a voltage determined by the binary weighted input

ANS:B - zero volts

Positive input of OPAMP is grounded. So OPAMP gives negative feed back in such a way that its negative input is also ground and the differential signal is zero.

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