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Lecture Notes RC Filters (P106-107, P102-105), Chapter 4: System Response) (02/06/03) I. RC Filters 1. Low-Pass Filter Consider a RC circuit as shown. Using voltage division, we get 1 1 1 1 C out in in in R C Z j C V V V Z Z j RC R j C ω ω ω = = = + + + V R C in V out V + - then, (1) 1 1 out in V V j RC ω = + The ratio of the output V to the input V is called Transfer Function (TF), a complex number.