I don’t understand the stuff at the end of the page.. why CD(V+ - V-)= Ic became
ID: 3348649 • Letter: I
Question
I don’t understand the stuff at the end of the page.. why CD(V+ - V-)= Ic became CD(-V+)=Ic??I understand that V-= ground = 0 And V+= Vout I don’t understand why we have a minus sign in “ CD(-V+)=Ic”
Could someone explain?
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Explanation / Answer
When we find current through capacitor, then Ic =CD(V+-V-)=C(-V0). This is because when we differentiate AC voltage we get negative value i.e. decreasing.
As the AC current through capacitor leads the capacitor voltage by 90 degree. Hence negative sign appears.
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