@@@@@@@@@@@@@@@@@uLCtB^̐݌vƍ̎v

                                    ver.2026.07.29


@@@@̓x́uLCtB^̐݌vƍ̎v_E[hĒAL܂B
        Thank you for downloading "Active Filter Design Specifications and Circuit Diagrams."

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PDLCtB^̐݌vƍ̎.pdf      uLCtB^̐݌vƍ̎v
QDLCtB^̐݌vƍ̎.txt       ̕
RDuLC vtH_                    f[^
SDuLCtB^݌v}NvtH_       dp}N


舵ʁ@t[\tg
\@E\OS@Wondows 10, Wondows 11
҂̃[AhX
@@@miura-_@lapis.plala.or.jp
ӁF@miura ̎̂Q́Ap}CiXu|vƔpA_[XRAuQvłB

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



{ł́AuLtActvƁudvO Dt.exev𗘗pLCtB^݌vE菇܂B
VectorJ́uLtActv̓ANeButB^̐݌vƃtB^̉H}쐬邽߂̃\tgEGAłB
uLtActv̓tB^̓`B֐̌Wlo͂邱Ƃo܂B
{ł͂̌Wf[^𗘗pLCtB^̑fqlvZĂ܂B
uLtActvőȉ~֐܂͋t`FrVFt̃[pXtB^݌vāA `B֐̌WlLCtB^̑fql߂Ă܂B
fqlvZ鎞ɁAudvO Dt.exevƃ}NuLC2in.UMFv𗘗p܂B
uLtSpicevgċ߂ꂽfqlH}ɓ͂ƎgmFł܂B


In this book, we experimented with the procedure for designing and synthesizing LC filters using "LtAct" and the "Calculator Program Dt.exe".
gLtAct,h available from Vector, is software for designing active filters and creating filter schematics.
gLtActh can also output the coefficients of a filter's transfer function.
This book explains an experiment in which this coefficient data is used to calculate the component values of an LC filter.
This tutorial explains how to design an elliptic function or an inverse Chebyshev low-pass filter using gLtActh and calculate the component values of an LC filter based on the transfer function coefficients.
To calculate component values, we use the gDt.exe calculator programh and the gLC2in.UMFh macro.
You can verify the frequency response by entering the component values calculated using gLtSpiceh into the circuit diagram.


ver.2026.04.24
 ȉ~֐܂͋t`FrVFt24܂łLCtB^uLtActvŐ݌v܂B
vZꂽ`B֐̌WpāAudvO Dt.exeṽ}NɂLCtB^̑fqlvZ܂B
uLtSpicevp̉H}ɑfql͂ĎgmF邱Ƃo܂B

 Design elliptic or inverse Chebyshev LC filters of orders 2 through 4 using gLtActh.
Using the calculated transfer function coefficients, the gDt.exeh calculator program calculates the component values of the LC filter via a macro.
You can enter component values into a circuit diagram for gLtSpiceh to verify the frequency response.


ver.2026.05.15
 57̃tB^[̐݌vǉ܂B\gđfqlvZ}N쐬܂B
`B֐̌W͂Kv܂̂Ŏg₷Ǝv܂B
uLtActvŌvZ`B֐̌W𗘗p@̃}NA\gɕϊ܂B

I've added designs for 5th and 7th order filters. I've created a macro to calculate element values using a table.

It should be easy to use as you don't need to input the transfer function coefficients.

I've also converted the macro that used the transfer function coefficients calculated with "LtAct" to the table-based method.


ver.2026.06.04
 \gLCtB^[̑fqlvZ}NR쐬܂B
 u}N̈ꗗvŃ}NI₷悤Ɋe}Nt@CƂɃ}Ň10xƂȂ悤ɁAƃvŐ܂B

}Nt@CuLC3-v0p0004dBv(}N5) ,uLC3-v0p0109dBv(}N 8) 
uLC3-v0p0988dBv(}N11) , uLC3-v0p28dBv(}N12) 
uLC5-v0p0004dBv(}N8) , uLC5-v0p0109dBv(}N10) 
uLC5-v0p0988dBv(}N11) , uLC7-v0p0004dBv(}N8) 
uLC7-v0.0109dBv(}N9) , uLC7-v0.0988dBv(}N9) 
uLtAct-LC}Nv(}N11)

I created many macros to calculate the element values of LC filters using tables.
To make it easier to select macros in the "Macro List," I organized them by degree and ripple so that each macro file contains approximately 10 macros.

Macro file names: "LC3rd-order ripple 0p0004dB" (5 macros), "LC3rd-order ripple 0p0109dB" (8 macros)
"LC3rd-order ripple 0p0988dB" (11 macros), "LC3rd-order ripple 0p28dB" (12 macros)
"LC5th-order ripple 0p0004dB" (8 macros), "LC5th-order ripple 0p0109dB" (10 macros)
"LC5th-order ripple 0p0988dB" (11 macros), "LC7th-order ripple 0p0004dB" (8 macros)
"LC7th-order ripple 0.0109dB" (9 macros), "LC7th-order ripple 0.0988dB" (9 macros)
"LtAct-LC macro" (11 macros)


ver.2026.07.02
 911tB^[̃}Nǉ܂B쐬H}Ǝg̃Otǉ܂B
uLC9-v0p1773 dBv(}N11)
uLC11-v0p1773 dBv(}N11)

Macros for 9th and 11th order filters have been added. Circuit diagrams and frequency response graphs have also been added.

"LC 9th order - Ripple 0p1773 dB" (11 macros)

"LC 11th order - Ripple 0p1773 dB" (11 macros)


ver.2026.07.16
 ̒ǉƏC܂B
 t^ƂāAuLC tB^ }Nō쐬H}Ǝgvǉ܂B
 uLtActv𗘗p2A34tB^[p̃}N쐬Ēǉ܂B
uActLCn2Atp0p1Xs5Amin23vAuActLCn2Atp0p1Xs20Amin47vA
uActLCn3Atp0p1Xs5Amin49vAuActLCn3Atp0p1Xs6Amin54vA
uactlcn4atp0p1xs1p5amin29vAuactlcn4atp0p1xs5amin75vAuactlcn4atp0p1xs6amin81vA
uactlcn4atp0p01xs3amin46vAuactlcn4atp0p01xs4amin75vAuactlcn4atp0p01xs6amin81v

I've made some minor additions and corrections to the explanation.
As an appendix, we have added "Circuit diagram and frequency characteristics created with LC filter macros."
I've created and added macros for second-order, third-order, and fourth-order filters using "LtAct".
"ActLCn2Atp0p1Xs5Amin23", "ActLCn2Atp0p1Xs20Amin47",
"ActLCn3Atp0p1Xs5Amin49", "ActLCn3Atp0p1Xs6Amin54",
"actlcn4atp0p1xs1p5amin29", "actlcn4atp0p1xs5amin75", "actlcn4atp0p1xs6amin81",
"actlcn4atp0p01xs3amin46", "actlcn4atp0p01xs4amin75", "actlcn4atp0p01xs6amin81"


ver.2026.07.29
 ver.2026.07.16̌J𒆎~āAu}Nō쐬H}pvudp̃}N𑝂₵āAv̍ŌƁut^  LCtB^ }Nō쐬H}Ǝgv̌ɒǉ܂B
@}Nō쐬H}Ɂu.paramvǉăJbgItgƕגRCӂɎw\ɂ܂B
@ɂAH}ɑ̑fql͂ȂŔCӂ̃JbgItgɕύXꍇ̎gyɁumFv邱Ƃo܂B
H}ɓd̃}NeLXgɂē\t܂̂ŁAKvȎɃ}ÑeLXgENbNāACtrl+CœeRs[āAd͍̓sɓ\tĎsΑfqlmFł܂B

The release of version 2026.07.16 has been discontinued, and "Utilizing Circuit Diagrams Created with Macros" has been added to the end of "Increasing and Organizing Macros for the Calculator" and after "Appendix: LC Filter - Circuit Diagrams and Frequency Characteristics Created with Macros."
The ".param" statement has been added to circuit diagrams created with macros, allowing for arbitrary specification of the cutoff frequency and load resistance.
This makes it easy to "check" the frequency characteristics when changing the cutoff frequency without having to input numerous component values ??into the circuit diagram.
I've pasted the calculator macro as text into the circuit diagram, so whenever you need it, you can right-click the macro text, copy the contents with Ctrl+C, paste it into the calculator's input row, and run it to check the component values.
