1) An Op-Amp is powered with a single 12V supply. If Vin(-) = 5V and Vin(+) = 3V

Question

1) An Op-Amp is powered with a single 12V
supply. If Vin(-) = 5V and Vin(+) = 3V, what is
the output voltage if there is no feedback
resistor, Rfb?

2) An Op-Amp is connected in the inverting
configuration with Rin = 4k? and Rfb = 1k?. If
the input voltage is 4 VDC, what is Vout?

3) If the input voltage to a Full-Wave Bridge
Peak Rectifier is vi(t) = 10.4sin(600??t) Volts,
what is the peak output voltage. Assume all
diodes have a 0.7V drop, (ie. VD = 0.7V).

4) For the previous problem, if the resistor in the
circuit is equal to 10k? and the capacitor is
equal to 1

Explanation / Answer

1) Output is 0(Zero). Because Vout= A*(V_ - V+) here gain is infinte and V_ > V+ so output is -Vsat and it is 0 because other supply is not given.

2) For inverting configuration Vout= (- Rf/R1)Vin so o/p is 8 v.

3) Here Vp=10.4 volts and drop across a diode is 0.7v the Vout= Vp - Drop across 2 diode(req for fwd bias)=10.4 - (2*0.7) =9Volts

4) Vdc=[1 - (1/2fRC) ]Vp

in above ques f=600 R=10k Ohm C=1U F Vp=9v

Vdc=8.25 volts

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