? 13. (TCO 2) What value for Ri is required for an inverting op-amp circuit if R

Question

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13. (TCO 2) What value for Ri is required for an inverting op-amp circuit if Rf = 270 k omega and the gain is to be -20? 12.5k omega 13.5 k omega 14.5 k omega 27.0 k omega 18.(TCO 2) What is the reference voltage for the comparator shown below? 0 V 1.36 V 1.50 V 13.64 V 22.(TCO 2) What is the output waveform of an ideal difference amplifier with identical sine waves that are in phase on its two inputs? Dc level Sine wave with 1/2 x amplitude Sine wave with 2 x amplitude Sine wave with 2 x frequency 24.(TCO 2) What is the name of the circuit shown below? (Points : 7) Oscillator Voltage follower Integrator Summer

Explanation / Answer

13) - (Rf / Ri) = - 20

so Ri = Rf / 20 = 13.5 Kohm .......(b)

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18) using voltage divider :

Vref = [10K / (10K+100K)] * 15 = 1.36 V .......(b)

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22) b

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23) also (b)

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