We can make a rectifier with only diode. But it has a
limitation. It can not rectify the applied voltage below .6 volts. Because of
the required voltages to make a diode active is more than .7 volts.
On the other hand if we use an op-amp as a rectifier we are
not to face such kind of limitations.
To build a rectifier with op-amp we have to use two diodes.
In this circuit we denoted two diodes as D1 and D2 respectively. During the
positive portion of the applied voltage D1 is active. And output voltage is 0
volt. For the negative portion of the applied voltage D2 is active. And the
output voltage is +Ei.
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Inverting Linear Half Wave Rectifier diagram
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