What kind of AF LPF is this?

Status
Not open for further replies.
It is a unity-gain Sallen-Key lowpass topology.
 
Reactions: neazoi

    neazoi

    Points: 2
    Helpful Answer Positive Rating
Hi,

if you need exact cutoff frequency and/or special filter characteristc (Bessel, butterworth...) then if you combine second order to higher order .. each stage has it´s own parameters.
--> two equal lowpass filters, each with Fc of 1kHz will result in a filter with fc smaller than 1kHz.


Klaus
 
Reactions: neazoi

    neazoi

    Points: 2
    Helpful Answer Positive Rating

I have done that with the second part of the circuit (CW) shown in the picture. I have cascaded 3 of them and I achieved a sharp CW BPF. But this was because this was a bpf and all sections center frequencies were the same and the roll-off just went steeper when cascaded 3 of them.

But in the case of the SSB LPF, how do you propose to do it in a discrete active way?
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…