aList down four characteristics of an ideal operational amplifier.
[4Marks]
bFigure Q3ashows the block diagram of an open-loop amplifier with open-loop gainA. Figure Q3bshows the block diagrum for a closed-loop amplifier with feedback factor, The E symbol is a summing nodc while Vi is the input signal,ver is the output signal and V is the noise signal.The signal-noise ratioS/N at the output of a system is defined as S/N VVn iProduce an expression for the output signal.Vor in Figure Q3a [2Marks] iProduce an expression for the output signal,voin Figure Q3b [3Marks] ji Compare which amplifier has a better performance [6Marks]
Figure Q3(n)
Figure Q3(b)
eFigure Q3c i model of an op-amp stage with the following charclenstiest input bis currentT=0.5A.input offsct current.l0.2Aand inpur offsct voltagc.VmV Consider the resistanccs R10 k2 and R200 k icaleulate the output offsct voltage VayVi [4Marks] caleulate the outpur ofsetvoltage Vos [4Marks] ii compute the overall worst-case oulput oflset voluge [2Marks] R, N
110
40 R.