http://img360.imageshack.us/img360/5409/89911672ku4.jpg
The gain of an inverting amplifier is given by G=-Rf/R which means that if Rf=R the gain will be -1.
Looking at the image provided by the link above we know that when Ei is negative the precision rectifier will behave as much as an inverting amplifier does. The only difference in the circuit is D2 in series with the output once D1 in this case is "off" (it's like if it wasn't there). Why does the gain remain the same (G=-1) with D2 placed in there?
However, why does Vo=+Ei? Shouldn't Vo be equal to +Ei-0.6 (0.6V is the voltage drop across the diode)? Why is Voa=Vo+0.6...shouldn't Voa be equal to +Ei?
The gain of an inverting amplifier is given by G=-Rf/R which means that if Rf=R the gain will be -1.
Looking at the image provided by the link above we know that when Ei is negative the precision rectifier will behave as much as an inverting amplifier does. The only difference in the circuit is D2 in series with the output once D1 in this case is "off" (it's like if it wasn't there). Why does the gain remain the same (G=-1) with D2 placed in there?
However, why does Vo=+Ei? Shouldn't Vo be equal to +Ei-0.6 (0.6V is the voltage drop across the diode)? Why is Voa=Vo+0.6...shouldn't Voa be equal to +Ei?