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cqmyg5
Joined: 21 Oct 2003
Posts: 137
Helped: 1
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 20 Jul 2004 11:19 A "passive filter" is a Butterworth type or Chebys |
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Attached circuit is a simple passive filter, It's a Butterworth type or a Chebyshev type? or other type?
Could anyone tell me? Could a passive filter be classified to Butterworth or Chebyshev type?
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maranaza
Joined: 27 Mar 2002
Posts: 51
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| 20 Jul 2004 12:12 Re: A "passive filter" is a Butterworth type or Ch |
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The type of the filter approximation depends on the component values. Also, load and source resistances influence the characteristic. If source res is 0, than C3 does not influence the filter characteristic.
maranaza
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emmos
Joined: 30 Dec 2003
Posts: 60
Helped: 2
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| 20 Jul 2004 14:09 Re: A "passive filter" is a Butterworth type or Ch |
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hi
think the Butterworth and Chebyshev are passive as they use R,L,C and active filters are designed by operational amplifier also the IIR filters an FIR filters.
There are alot of tutorials on the net for that.
bye
emmos
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Regnum
Joined: 17 Jun 2004
Posts: 264
Helped: 12
Location: Hurlingham
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| 20 Jul 2004 14:33 Re: A "passive filter" is a Butterworth type or Ch |
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| emmos wrote: |
hi
think the Butterworth and Chebyshev are passive as they use R,L,C and active filters are designed by operational amplifier also the IIR filters an FIR filters.
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nope.
The filter aproximation (Butterworth, Bessel, Chebichev, Cauer, whatever) depicts filter loss in passband and stopband, and you may synthetise them with passive networks, active networks or computational algorithms (digital filters).
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flatulent
Joined: 19 Jul 2002
Posts: 4879
Helped: 295
Location: Middle Earth
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| 20 Jul 2004 17:03 Re: A "passive filter" is a Butterworth type or Ch |
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Your circuit uses only two types of components R and C. This will produce poles and zeros only on the real axis of the S plane.
The Butterworth and Chebychev filters have complex poles in the S plane. There is no way to adjust your component values or source and load impedance to get complex poles for your circuit.
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Borber
Joined: 01 Jan 1970
Posts: 1506
Helped: 116
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| 21 Jul 2004 18:05 Re: A "passive filter" is a Butterworth type or Ch |
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| Your filter is tipical low-pass for PLL loop. It is neither Chebyshev or any other standard type of low-pass.
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hanjiemy
Joined: 11 Jun 2004
Posts: 54
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| 02 Aug 2004 8:13 A "passive filter" is a Butterworth type or Chebys |
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| 3-order passive loop filter for 4-order PLL
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