23.10.2008

Osman Gülercan

16169230356

Conclusion For Experiment1

In this experiment, we studied opamp circuits and implemented some different using methods. First

circuit is a comparator, if the input is higher than zero, the output is +Vcc; and the input is lower than

zero, the output is –Vcc. Second one is a voltage follower, and whatever we connect its input, the

output is the same. This method is used to block the input impedanses. Thirdly, we analysed a non-

inverting amplifier. Its output is doubled in the same phase because of the Av=(1+Rf/R1)=2. Another

circuit is an inverting amplifier, its output is the inverse of the input voltage (Av=-1). The other circuit is a

differentiator, it uses the capacitor to differentiate the input voltage. The capacitor behaves as an open

circuit at D.C. Another is an integrator. This circuit integrates the input signal and inverses it.

Furthermore, because there is a “virtual ground” at the inverting input terminal, the resistance seen by

the capacitor is C x Rf (in this circuit 0,2uF x 100k = 200ms). Lastly, the summer amplifier is used to sum

the input voltages which are used to digital signal. All the currents across the resistances are different

each other, so the summing value is different. Because of the using inverting input, the output voltage is

also inverted. To sum up, in these circuits, we learned different kinds of opamp circiuts which are very

important to being an electronic engineer.