I'm trying to design a notch filter to suppress an oscillator signal coming through a mixer (namely, 53.125 MHz), at the same time I must get the best possible signal at 60 MHz.
I've been running some simulations - it seems lowering the capacitor value and increasing the inductor value makes the "notch" steeper. It would seem in this example design, I would be losing a lot of signal on 60 MHz?
What confuses me, also, is the role of the value of the resistor here, I don't really understand what the lower blue line and the dotted green line represent.
As I lower the resistor value, the lower blue line moves up and the dotted green line curves.
Can someone give a basic idea of what's going on here?