- #1
jghlee
- 16
- 0
So this is a pretty general question regarding the cut-off frequency for any filter. In my study of filters, I've come across certain equations that the book gives for wc.
For example, Low/High Pass filters have wc = 1/(RC) or R/L, and Bandpass/stop filters have the center frequency wo^2 = 1/(LC). I'm able to derive these equations from some pretty generic L/H Pass Filter examples so I know where they come from.
Now my question is, do these equations apply to any filters of its kind? Meaning, can I always find the wc for a L/H pass filter by simply plugging in the 1/(RC) or R/L values? I'm terrible confused because all of my course homework seems to point this out but I'm not too sure in situations for when there's multiple L/C/R's or when I have RLC filters in which case a simple 1/(RC) doesn't seem to accurately depict the wc since it's missing the L value..
If somebody could clarify the meaning of those wc and wo equations, I'd appreciate it very much.
For example, Low/High Pass filters have wc = 1/(RC) or R/L, and Bandpass/stop filters have the center frequency wo^2 = 1/(LC). I'm able to derive these equations from some pretty generic L/H Pass Filter examples so I know where they come from.
Now my question is, do these equations apply to any filters of its kind? Meaning, can I always find the wc for a L/H pass filter by simply plugging in the 1/(RC) or R/L values? I'm terrible confused because all of my course homework seems to point this out but I'm not too sure in situations for when there's multiple L/C/R's or when I have RLC filters in which case a simple 1/(RC) doesn't seem to accurately depict the wc since it's missing the L value..
If somebody could clarify the meaning of those wc and wo equations, I'd appreciate it very much.