amr alaa
04-09-2010, 11:06 AM
السلام عليكم و رحمة الله و بركاته
There was a mistake in our solution for the problem of Midterm 2004-Pb2-b in the part that he asked about what will happen if a resistance Rl=100kohm and Cl=10uF is connected across the output voltage.
We proved that the time constant =1sec is very large compared to the periodic time T=1msec. Thus, the capacitor will discharge very slowly and we can assume that the capacitor voltage is nearly constant along half the period. So, when Vi=-20 -->V0=+5 and when Vi=10--> V0=35V and decaying with a very slow rate (large time constant) thus we can consider it constant. So the average DC value for the output =(5+35)/2=20 and not 35 as we said in the section.
My regard
Amr Alaa
There was a mistake in our solution for the problem of Midterm 2004-Pb2-b in the part that he asked about what will happen if a resistance Rl=100kohm and Cl=10uF is connected across the output voltage.
We proved that the time constant =1sec is very large compared to the periodic time T=1msec. Thus, the capacitor will discharge very slowly and we can assume that the capacitor voltage is nearly constant along half the period. So, when Vi=-20 -->V0=+5 and when Vi=10--> V0=35V and decaying with a very slow rate (large time constant) thus we can consider it constant. So the average DC value for the output =(5+35)/2=20 and not 35 as we said in the section.
My regard
Amr Alaa