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Active filter design software AktivFilter 3.4

New: Due to numerous requests, the new version AktivFilter 3.4 now offers the option of using a dongle in the form of a handy USB stick instead of registration: the USB Key.

The usual problem

You are an electronics engineer, you have to develop an electronic device, and you need an active filter circuit which fulfills your specification. After the test of your built circuit, you observe that the frequency response deviates from your specification. So, you try to adjust the circuit, you measure the frequency response, and you repeat this very often. This matching can be a quite time-consuming process.

Our solution: AktivFilter 3.4

AktivFilter 3.4 design software is able to design active filters, which are tuned on the operational amplifier and on the standard series (E12, E24, E48, E96, or E192) of resistors and capacitors. This tuning works so fine that a manual matching of the designed filter circuit becomes unnecessary. AktivFilter 3.4 can design active bandpass filters, highpass filters, lowpass filters and notch filters. For many applications AktivFilter enables you to use inexpensive (slow) opamp types instead of expensive (fast) opamps. AktivFilter supports many special high-quality audio opamps, which are used in audio electronics - in consumer products, studio equipment and high-end equipment.

AktivFilter can create filters with the characteristics Bessel, Butterworth and Chebychev. Additionally, you can specify an individual characteristic by setting the parameters pole quality Q and the normalized pole frequency for each stage of your active filter. This can be a useful feature, e.g. if you want to develop a special active crossover network for loudspeakers.

While AktivFilter 3.4 is able to co-ordinate filter designs on opamp types, it is important, that the program supports all ordinary opamp types. Here is a list of all supported opamps:

AD648, AD711, AD712, AD713, AD741, AD743, AD797, AD8021, AD8031, AD8032, AD8045, AD8047, AD8057, AD8058, AD8061, AD8062, AD8063, AD8099, AD817, AD822, AD823, AD825, AD826, AD829, AD845, AD847, ADA4528-1, ADA4528-2, ADA4895-1, ADA4895-2, CA3140, CA3160, EL2245, EL2445, FAN4174, FAN4274, HA-2600, HA-2602, HA-2620, HA-2622, HA-2841, HA-2842, HA-5020, HA-5101, HA-5102, HA-5104, HA-5112, HA-5114, HA-5127, HA-5137, HA-5147, HA-5190, HA-5221, HA-5222, HA17082, HA17083, HA17084, HA17558, HA17741, LF351, LF353, LF356, LF357, LF411, LF412, LF441, LF442, LF444, LF451, LM101A, LM107, LM108, LM118, LM124, LM139, LM148, LM149, LM158, LM193, LM201A, LM208, LM218, LM224, LM239, LM248, LM258, LM2902, LM2904, LM293, LM301A, LM307, LM308, LM318, LM324, LM3302, LM339, LM348, LM349, LM358, LM393, LM4562, LM6118, LM6142, LM6144, LM6152, LM6154, LM6161, LM6162, LM6164, LM6165, LM6171, LM6172, LM833, LMC6062, LMC662, LME49710, LME49720, LME49740, LME49860, LME49870, LME49990, LMH6624, LMH6626, LMH6639, LMH6642, LMH6643, LMH6644, LMH6657, LMH6658, LMP7701, LMP7702, LMP7704, LMV771, LMV772, LMV774, LMV821, LMV822, LMV824, LT1013, LT1013D, LT1014, LT1028, LT1055, LT1056, LT1115, LT1151, LT1211, LT1212, LT1213, LT1214, LT1352, LT1353, LT1355, LT1356, LT1357, LT1358, LT1359, LT1361, LT1362, LT1363, LT1364, LT1365, LT1413, LT1462, LT1463, LT1464, LT1465, LT1492, LT1493, LT1494, LT1495, LT1496, LT1498, LT1499, LT1635, LT1638, LT1639, LT1677, LT1792, LT1793, LT1801, LT1802, LT1815, LT1816, LT1817, LT1884, LT1885, LT2078, LT2079, LT2178, LT2179, LT6236, LT6237, LT6238, MAX410, MC1458, MC1558, MC33078, MC33079, MC33272, MC33274, MCP6001, MCP6002, MCP6004, NCV33274, NE5532, NE5533, NE5534, OP07, OP113, OP1177, OP15, OP16, OP160, OP20, OP21, OP213, OP2177, OP27, OP270, OP275, OP37, OP413, OP4177, OP467, OP470, OPA130, OPA132, OPA134, OPA141, OPA1611, OPA1612, OPA1652, OPA1654, OPA2107, OPA2132, OPA2134, OPA2141, OPA2227, OPA2228, OPA227, OPA228, OPA2334, OPA2335, OPA2340, OPA2354, OPA2355, OPA2356, OPA2369, OPA2604, OPA2652, OPA2725, OPA2726, OPA2810, OPA334, OPA335, OPA3355, OPA340, OPA354, OPA355, OPA356, OPA369, OPA4132, OPA4134, OPA4141, OPA4227, OPA4228, OPA4340, OPA4354, OPA4820, OPA604, OPA606, OPA627, OPA637, OPA650, OPA655, OPA725, OPA726, OPA810, OPA820, OPA842, OPA843, SN10501, SN10502, SN10503, THS4001, THS4304, TL022, TL031, TL032, TL034, TL051, TL052, TL054, TL061, TL062, TL064, TL071, TL072, TL074, TL081, TL082, TL084, TL3472, TL3474, TL971, TL972, TL974, TLC2201, TLC2202, TLC2272, TLC2274, TLE2071, TLE2072, TLE2074, TLE2081, TLE2082, TLE2084, TLV2460, TLV2461, TLV2462, TLV2463, TLV2464, TLV2465, TS902, TS904, TS912, TS914, TS924, TS951, TS952, TS954, uA741

AktivFilter 3.4 is a program for Microsoft Windows 7, 8.1, 10, and 11.

AktivFilter 3.4 is available in these editions:

The free Demo Edition, which can be downloaded here.
The Personal Edition for one user with one computer.
The Professional Edition for one user with one computer. The Professional Edition has, compared to the Personal Edition, one additional feature: the user can add his own opamp-models to the software. To do this, we deliver the Professional Edition together with OpAmp-Modell software.

The Personal Edition as well as the Professional Edition can be installed on just one computer. The installation of the software must be registered within 30 days. The registration can be made up to three times.

Owners or purchasers of a Personal or Professional Edition of AktivFilter 3.4 have the option of purchasing a USB Key as an accessory, which allows the software to be used without registration. The USB Key is a USB flash drive that is plugged into the PC, thereby activating an installed copy of AktivFilter 3.4 Personal or Professional Edition without registration. Therefore, AktivFilter 3.4 can be installed on multiple computers and will always run on the computer in which the USB Key is inserted.

Owners or purchasers of a Personal or Professional Edition of AktivFilter 3.4 also have the option of purchasing a Key Disk, which allows the software to be used without registration. The Key Disk is a data carrier that is inserted into a DVD drive (burner or read drive), thereby activating an installed copy of AktivFilter 3.4 Personal or Professional Edition without registration. Therefore, AktivFilter 3.4 can be installed on multiple computers and will always run on the computer in whose DVD drive the Key Disk is inserted.

A sample that shows how to use AktivFilter 3.4 is available here.