Magnitude of the transfer function

Click For Summary
The discussion centers on the surprising observation that the magnitude of a transfer function can exceed 1, which contradicts the common belief that filters only attenuate signals. It is clarified that filters with feedback loops can amplify certain frequencies, leading to a gain greater than unity. Active filters, such as audio amplifiers, can consistently provide gain across all frequencies, while even passive filters can achieve voltage magnification in specific frequency bands. Examples like the Twin Tee network demonstrate that passive circuits can exhibit gains above unity under certain conditions. This highlights the complexity of filter behavior and the potential for unexpected amplification in various circuit designs.
  • #31
The Electrician said:
How did you find this? What search terms did you use? I've seen interesting references to that old magazine, Tele-Tech, but I would never have expected that such relatively obscure articles would be indexed.
The article by Longmire was cited by authors in one of the google hits. If I couldn't have free access to the article, maybe I could read from its bibliography. This here: http://ieeexplore.ieee.org/document/4051325/references

So I simply needed to find an archive of the Tele-Tech publication.
 

Similar threads

Engineering How do I draw the Bode diagram of this transfer function?
  • · Replies 3 ·
Replies
3
Views
2K
Homework help: Transfer Function and Half Power Frequency
  • · Replies 1 ·
Replies
1
Views
4K
Engineering RC circuit Transfer Function/bode plot
  • · Replies 32 ·
2
Replies
32
Views
13K
MATLAB Filtering with Discrete transfer functions in matlab
  • · Replies 3 ·
Replies
3
Views
5K
Band Pass Filter Transfer Function Analysis
  • · Replies 6 ·
Replies
6
Views
30K