Hello all,
I need some advice on an approach to determine β for a multiple feedback filter. My scanner is broke, but I have pages and pages of lengthy derivations and I am stuck.
My first approach was to consider two β's and them add them together using superposition. β1 would be at the R3/C1/R2 node (see attached) and β2 would be at the classic summing junction.
I was oh so close to Equation 16 from TI's application note (also in the attached).
Rather than ask for someone to help me with the math at this point, I would like to know if my approach makes sense. β1 + β2 = β(total) or as shown in the attached WORD doc.
The more I think about this, I believe I cannot do this but I am lost. Is there a better approach of how I can view the circuit? I can trod through the math, but I need some insight on how I can setup my nodes in these two feedback loops.
One is easy, two is driving me to drink.
-Ken
I need some advice on an approach to determine β for a multiple feedback filter. My scanner is broke, but I have pages and pages of lengthy derivations and I am stuck.
My first approach was to consider two β's and them add them together using superposition. β1 would be at the R3/C1/R2 node (see attached) and β2 would be at the classic summing junction.
I was oh so close to Equation 16 from TI's application note (also in the attached).
Rather than ask for someone to help me with the math at this point, I would like to know if my approach makes sense. β1 + β2 = β(total) or as shown in the attached WORD doc.
The more I think about this, I believe I cannot do this but I am lost. Is there a better approach of how I can view the circuit? I can trod through the math, but I need some insight on how I can setup my nodes in these two feedback loops.
One is easy, two is driving me to drink.
-Ken
Attachments
-
25.5 KB Views: 18