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Old 4th April 2012, 06:50 PM   #1
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Default Simulating a T Filter?

Does anyone know how to simulate various filters? I am trying to find the dB and ideally phase response of a T filter. Couldn't find anything on google. Is it similar to that of a RC filter?
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Old 11th April 2012, 09:53 PM   #2
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Maybe someone knows how to calculate the corner frequency of a T filter?
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Old 11th April 2012, 11:14 PM   #3
godfrey is online now godfrey  South Africa
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Circuit simulation software is good for this sort of thing. I use the free version of SIMetrix SIMPLIS. Others prefer LTSpice.
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Old 11th April 2012, 11:19 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

Your not really asking a sensible question. T filters are simply 3rd order low
(LCL) or high (CLC) pass filters and there is lots of info on the internet.

TinaTi is a (great and simple) free circuit emulator that may help.

rgds, sreten.

T and Pi filters usually relate to discussing radio circuits.
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Last edited by sreten; 11th April 2012 at 11:28 PM.
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Old 11th April 2012, 11:36 PM   #5
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Quote:
Originally Posted by godfrey View Post
Circuit simulation software is good for this sort of thing. I use the free version of SIMetrix SIMPLIS. Others prefer LTSpice.
I have and use LTSpice but I'm not sure how to create and plot a frequency sweep in that software. I suppose I could do a ton of single simulations and plot a curve, but I haven't tried to start that process yet and it might be a big waste of time.
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Old 11th April 2012, 11:43 PM   #6
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Quote:
Originally Posted by sreten View Post
Hi,

Your not really asking a sensible question. T filters are simply 3rd order low
(LCL) or high (CLC) pass filters and there is lots of info on the internet.

T and Pi filters usually relate to discussing radio circuits.
I was referring to a RCR low pass filter. You would be surprised how little information is on the internet about these filters, at least as much as I can find. I will check out TinaTi.
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Old 12th April 2012, 01:19 AM   #7
godfrey is online now godfrey  South Africa
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Quote:
Originally Posted by vladimirb0b View Post
I have and use LTSpice but....
IMHO, LTSpice has a terrible interface and is very difficult to use. Simetrix is much simpler and easier to use. I don't know how it compares to Tina as I haven't tried that one.

p.s. Avoid Circuitmaker. The free version doesn't work properly.

Quote:
Originally Posted by vladimirb0b View Post
Couldn't find anything on google.
Wikipedia to the rescue!

Last edited by godfrey; 12th April 2012 at 01:30 AM.
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Old 12th April 2012, 02:43 AM   #8
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What does this topic have to do with Digital Line?
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Old 12th April 2012, 01:55 PM   #9
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by vladimirb0b View Post
I was referring to a RCR low pass filter.
You would be surprised how little information is on the internet about
these filters, at least as much as I can find. I will check out TinaTi.
Hi,

RCR isn't much of a low pass filter. Assuming low source impedance and
high loading impedance its the same as an RC, the second R makes no
difference, typically the case for audio.

In radio circuits where your matching impedances its a little more complicated.
The R in the "RC" calculation is the (Zsource+Rin)||(Zload+Rout).

TinaTi is dead easy to use, and automatically does frequency analysis.

rgds, sreten.
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Last edited by sreten; 12th April 2012 at 01:57 PM.
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Old 12th April 2012, 04:49 PM   #10
macboy is offline macboy  Canada
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Quote:
Originally Posted by vladimirb0b View Post
I have and use LTSpice but I'm not sure how to create and plot a frequency sweep in that software. I suppose I could do a ton of single simulations and plot a curve, but I haven't tried to start that process yet and it might be a big waste of time.
You need to do an "ac" analysis. You will specify the start and stop frequencies and number of points in between. The software takes care of the rest. This is generic spice stuff, not specific to LTSpice.
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