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Forums
4hv.org :: Forums :: General Science and Electronics
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Does anyone know what type of filter this is ?
Move Thread LAN_403
Patrick
Mon Aug 06 2018, 11:49PM Print
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		this schematic :


1533599352 2431 FT0 Filter
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WaveRider
Tue Aug 07 2018, 09:30AM
WaveRider Registered Member #29 Joined: Fri Feb 03 2006, 09:00AM
Location: Hasselt, Belgium
Posts: 500
 		Elliptical (Cauer) low pass filter with band stop notch at f=1/(2*pi*sqrt((1-m^2)*L*C)) and stop-band leakage of 1-m^2 if I did the math correctly.
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hen918
Tue Aug 07 2018, 01:46PM
hen918 Registered Member #11591 Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
 		Here is a normalised (L and C are both set to 1) plot of the frequency response with different values of m. w is the angular frequency (2*pi*f).
As WaveRider says it's a lowpass with a band stop notch.
1533649611 11591 FT182763 Filter
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DerAlbi
Tue Aug 07 2018, 02:37PM
DerAlbi Registered Member #2906 Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727
 		That much work, no dB frown
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Patrick
Wed Aug 08 2018, 12:00AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		thanks everybody ! especially for the trouble of a graph. 4HV.org just keeps proving its value to the world again and again.
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Ash Small
Wed Aug 08 2018, 10:37AM
Ash Small Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
 		Very interesting Patrick.

If I add a cap of correct value to my 'Pi' filter (see my power supply sim thread) it increases stability from 1mV to 200uV, an increase of x5.

I guess I should use non-polarised caps?

Link to thread here: Link2
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