This isn't really an exact homework problem since it's for a report I'm doing. Basically, I was wondering what the design for a second order passive low pass filter looks like. I know how to design a regular first order circuit but I have no clue about a second-order PASSIVE LPF. I tried just cascading two RC circuits and using 1/(2pi(RC)) to define the cutoff frequency but after simulating it on my computer, the actual cutoff is quite off. Anyone have any insight into this?? Thanks in advance.