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                                    ver.2026.02.04


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        Thank you for downloading "Active Filter Design Specifications and Circuit Diagrams."

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Vector̍҂̃y[W
https://www.vector.co.jp/vpack/browse/person/an008575.html




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https://www.vector.co.jp/soft/winnt/edu/se521760.html
https://www.vector.co.jp/soft/winnt/edu/se525207.html

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ɏڂKvȂ΁AJ̃\tgEGAɓĂ鎑uANeButB^̐݌v.pdfvuLtAct .pdfvȂǂQƂĂB



This document explains how to input "design specifications" when designing an active filter and creating its circuit diagram using "LtAct" or "ActiveFilter-Design-Schematics," both of which are currently available from Vector, as well as the "circuit diagram" and its "transfer function" generated by "LtAct."

Please download the above software from the link below.
https://www.vector.co.jp/soft/winnt/edu/se521760.html
https://www.vector.co.jp/soft/winnt/edu/se525207.html

This document explains the design specifications and circuit diagrams of low-pass filters.

Regarding how to input design specifications, we will explain two methods: (1) a method that focuses on the cutoff frequency and filter order, but does not pay much attention to other factors, and (2) a method that focuses on ensuring an attenuation of atts or more at frequencies Fs or higher that exceed the cutoff frequency Fc, and lets the software "LtAct" determine the filter order.

In this book, (1) is explained as "when entering the order" and (2) as "when not entering the order."

In method (1), the parameter Xs is entered to check the attenuation at frequency Fs, which is Xs times the cutoff frequency Fc. However, this is not a design specification for the filter.

In method (2), you enter the parameter Xs to design a filter whose attenuation at a frequency Fs that is Xs times the cutoff frequency Fc is greater than or equal to atts. This is the filter design specification.And since the attenuation is greater than or equal to atts at frequencies above Fs, atts is called the minimum attenuation.

If you need more detailed explanations, please refer to the documents included with the released software, such as "Active Filter Design.pdf" and "LtAct Operation Manual.pdf."


ver.2025.09.28ł
@u}sȌ݌vvǉ܂B
In version 2025.09.28, 
   we added the "Designing Steep attenuation Characteristics" feature.

ver.2025.10.07ł
@uȉ~֐E[pXtBC^[vɁuFp = 1 kHzXs = 1.03 ̂ƂAFs  120 dB ȏ̌݌vvǉ܂B
In ver.2025.10.07,
we added a design to the gElliptic Function Low-Pass Filterh that achieves attenuation of 120 dB or more at Fs when Fp = 1 kHz and Xs = 1.03.


ver.2025.10.15ł
@p45p66̕܂͌oɌ͂L̂ŁA܂B

In version 2025.10.15, 
   There were typos in the text or headings on pages 45 and 66, so they have been corrected.


ver.2025.10.22ł
@p47p74̕܂͌oɌ͂L̂ŁA܂B
utB^[̎ƎgƂ̌ʁvɁuʂ̑@vǉ܂B

In version 2025.10.22, 
   There were typos in the text or headings on pages 47 and 74, so they have been corrected.
   Added "Method of measuring attenuation" to "Filter order and attenuation for each frequency."


ver.2026.01.27ł
 u̔rvǉ܂B
  u͂߂Ɂv̎Ɂu Cautionvǉ܂B
  uLTSpicevgpāAuLtActvō쐬H}V~[VOɓǂłB

In version 2026.01.27, 
   we added a "Comparison of Attenuation Characteristics" section.
   A "Caution" has been added after the "Introduction."
   Please read this before using "LTSpice" to simulate a circuit diagram created with "LtAct."


ver.2026.02.04ł
 u̔rv-> ur 1v->uQlvɉp̐ǉ܂B

  In version 2026.02.04, 
  we added an English explanation to "Comparison of damping characteristics" -> "Comparative Example 1" -> "Reference Experiment."



