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who can provide some material for a filter with eight terminals?

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superleaf

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I got a analog filter here,but this structure of the filter is a little weird,it has four input terminals and four output terminals,i have never seen this structure before,who can provide me some materials about this structure,or tell me how it works with eight terminals.Thank you very much!
 

I have an animal here, it has four legs and a head. Can you tell me what it is? No? You mean you need something like a picture?
 

I am afraid i can,t provide information in detail,because it is technical secret,in additional,the circuit is extremely large.my meaning is "someone have done some research in bandpass filter before probably can provide some information for this structure"
barry said:
I have an animal here, it has four legs and a head. Can you tell me what it is? No? You mean you need something like a picture?
Click to expand...
 

superleaf said:
I got a analog filter here,but this structure of the filter is a little weird,it has four input terminals and four output terminals,i have never seen this structure before,who can provide me some materials about this structure,or tell me how it works with eight terminals.Thank you very much!
Click to expand...

There is a filter structure called "Fleischer-Tow universal filter" with three input terminals and three output nodes. It contains three opamps (integrator, damped integrator, inverter) and allows all classic trnafer functions like lowpass, highpass, bandpass, bandstop, allpass, elliptical low/highpass. May be your circuit contains one additional opamp fur buffering or combining some outputs.
The basic functions are realized by connecting all or only some of the inputs with the input signal.

That is the only multi input topology I can remember.
 

Thank you very much,so ,could you provide some paper related to this kind of filter,i can't find any information from Internet.^_^
LvW said:
There is a filter structure called "Fleischer-Tow universal filter" with three input terminals and three output nodes. It contains three opamps (integrator, damped integrator, inverter) and allows all classic trnafer functions like lowpass, highpass, bandpass, bandstop, allpass, elliptical low/highpass. May be your circuit contains one additional opamp fur buffering or combining some outputs.
The basic functions are realized by connecting all or only some of the inputs with the input signal.

That is the only multi input topology I can remember.
Click to expand...
 

Re: Fleischer-Tow universal filter

See this book: images.jpg chap. 5.6.3 .
 
superleaf said:
Thank you very much,so ,could you provide some paper related to this kind of filter,i can't find any information from Internet.^_^
Click to expand...

Entering "Fleischer-Tow Biquad" in Google gave me a lot of references, for example

**broken link removed**

Although the filter topology was introduced by Fleischer and Tow, sometimes you can find it using the term "Tow-Thomas Biquad". Perhaps it helps.
 
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