Dion_Aus
Newbie level 2
Hi guys, my task is to cascade a 2nd order Butterworth LPF with a 2nd Butterworth HPF, individually my 2 filters function exactly as I want, however when I connect them together (ie LPF -> HPF) I do not get any passband, when my LPF -3dB frequency is 10kHz and my HPF's -3dB frequency is 5kHz... is it the way im connecting them (series)??? ive uploaded the bode plots for the individual filters.
Would appreciat the help, thanks.
Am I wrong in assuming there should be a passband between 5kHz and 10kHz???
Would appreciat the help, thanks.
![](https://obrazki.elektroda.pl/1_1274697212_thumb.jpg)
![](https://obrazki.elektroda.pl/100_1274697212_thumb.jpg)
![](https://obrazki.elektroda.pl/2_1274697212_thumb.jpg)
![](https://obrazki.elektroda.pl/96_1274697212_thumb.jpg)
Am I wrong in assuming there should be a passband between 5kHz and 10kHz???