Digital Signal Processing - Technical MCQs
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
5 volts
B
zero volts
C
a voltage determined by the binary weighted input
D
none of the above
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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