SSC JE Electrical Engineering 2017 Set 1 Paper

Question : 166 of 200

Marks: +1, -0

An OP AMP has an offset voltage of 1 mV and is ideal in all other respects. If this OP AMP is used in the circuit shown in the figure, the output voltage will be approximately

3 V
2 V
1 V
3.5 V

Validate

Solution:

Voltage at –ve terminal

(V_2)=(R_1/{R_1+R_F})V_0=({1K}/{1K+1M})V_0

offset voltage

V_{\ios} = (V_2 -V_2 )

V_i = 0

V_{\ios} = V_2

V_0=(1+R_F/R_1) v_{\ios}

=(1+{1×10^6}/{1×10^3})×1×10^{-3}

(1+10^3)×10^{-3}

V_o= 1

volt approx

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