History of the software AktivFilter
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Version Description
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1.2 - First version available in English
- Supports Sallen-Key highpass and lowpass with unity gain
and multiple-feedback bandpass
- Graphical output of amplitude frequency response
- PSPICE call interface
- Result can be saved to a HTML-file
2.0 - Additional circuits: highpass and lowpass with multiple feedback, twin-T bandreject
- HTML file output format improved
- In graphical output the shown frequency responses can be configured
- List of opamps extended
2.0a - List of opamps extended again
2.1 - Sallen-Key highpass and lowpass can be designed with gain
- Capacitor values can be set, optimized and changed
- Specification can be saved, loaded and edited
- In graphical output: y-axis can be inscribed in Hz
- PSPICE calls for linear amplitude response and combinations
- Input and output, e.g. in dialogs with usual prefixes (e.g. k, n, p)
2.1a - Bugfix: output of result in version 2.1 was incomplete at
Sallen-Key highpass and lowpass with gain
2.1b - Bugfix: when frequency range has been changed (Menu: Options, Frequency range)
the graphical output was false in version 2.1-2.1a at a Sallen-Key highpass
2.1c - When an input dialog is cancelled, the latest result is available
2.1d - Bugfix: a specification of a highpass or lowpass of odd order with set capacitor
values could not be loaded
- List of opamps was extended by OPA132, OPA2132 and OPA4132
2.1e - Bugfix: loading a specification of a highpass with multiple feedback
2.1f - Bugfix: loading a specification of a bandreject
2.1g - When quitting the program: question if the specification should be saved
2.1h - List of opamps extended
2.1i - List of opamps extended
2.1j - List of opamps extended
2.2 - Highpass and lowpass filters up to 30th order can be created
- The ripple of any Chebychev-filter an be given in the range 0.01 .. 20 dB
2.2a - Improved model of TLC2201 and TLC2202
2.2b - Bugfix: saving parameters of individual characteristic to specification
- List of opamps was extended by AD8047, AD8057 and AD8058
2.2c - List of opamps was extended by OPA2340, OPA340, OPA4340 and TS924
2.2d - Bugfix: output of gain for filters with gain < 0 dB
2.2e - Bugfix: output of capacitor values
2.2f - Bugfix: space characters in input values
- Bugfix: loading a specification with gain < 0 dB
2.3 - Bandpass filters up to 30th order can be created
2.3a - List of opamps extended
- Inputdialogs for bandpass, highpass and lowpass improved
2.3b - Bugfix: processing of licence information (Personal Edition only)
2.3c - List of opamps extended by AD822
2.3d - Bugfix: bandpass with sequence of stages for minimum noise
2.4 - Output file in XHTML 1.0 Strict, especially for improved printing
- List of opamps extended by TLE2081, TLE2082 and TLE2084
2.4a - List of opamps extended by LMC6062, LMC662, LT1013D, MCP6001, MCP6002,
MCP6004, OPA369 and OPA2369
2.4b - Bugfix: bandpass with sequence of stages for minimum noise
- Bugfix: unwanted limit of gain for bandpass
- List of opamps extended by LMV821, LMV822 and LMV824
2.4c - List of opamps extended by LMH6624 and LMH6626
2.4d - Bugfix: installation of Personal Edition under Vista
3.0 - New implementation with new features
3.0.1 - Flickering of moved cursor removed
3.0.2 - Bugfix in sorting of self-created opamps in the Professional Edition
- Texts in dialogs corrected
3.0.3 - Bugfix: bandpass: given capacitor values changed after editing specification
3.0.4 - Licence for companies added
- Menu call of inactive dialogs deactivated
- Improved call of timer function
3.0.5 - Dialogs improved for Windows 7
3.0.6 - Improved model of LT1056
- Bugfix: edit capacitor values of lowpass of odd order
3.0.7 - Call interface for Spice application improved
3.0.8 - Bugfix: highpass: frequency in filter parameters
3.0.9 - List of opamps extended by LMP7701, LMP7702, LMP7704, LMV771, LMV772 and LMV774
3.0.10 - Chebychev filters: lower limit of ripple reduced to 0.001 dB
3.0.11 - Bugfix: Sallen-Key lowpass and highpass with E12 standard values
3.0.12 - AktivFilter 3 Campus Edition integrated
3.0.13 - Registration simplified
3.0.14 - Bugfix: Spice interface for highpass and lowpass filters with sequence of stages
for minimum noise
3.0.15 - Higher precision of filter parameters
- Check of min. ripple for Chebychev filters improved
- Output of ID in registration dialog
3.0.16 - Bandpass: max. bandwidth lifted to 10x fm
3.0.17 - Bugfix: after upgrading Windows, registration does not work
- Bugfix: calculation of bandpass filters may hang for some input parameters
- Bugfix: calculation of bandpass filters may deliver a flat frequency response
for some input parameters
- Improved algorithm for bandpass filter calculation
- Input dialog for bandpass filters with addition input fields for corner frequencies
- Frequency range (menu item Options) is stored when quitting the program
3.0.18 - Bugfix: save specification when quitting the program
3.1 - New circuit: 3rd order Sallen-Key lowpass with 1 opamp
- List of opamps extended
- Maximum possible frequency range for display extended to 0.01 .. 100 fc
- Tool OpAmp-Modell 1.1: additional parameter check, which improves the detection
of false input data
3.1.1 - Bugfix: file types in file dialogs
- Display of calculated parts values improved
- Display of filter parameters improved
- Special dialog for 3rd order Sallen-Key lowpass with 1 opamp
3.1.2 - Bandpass: check of input parameters improved
- Bandreject: E12 standard values removed
- List of opamps extended
- Formating of component values output improved
3.1.3 - Bugfix: graphical display of group delay response
- Dialog for individual parameters: tab order fixed
- Gain input now possible as a number or in dB
3.1.4 - Bugfix: bandpass: component value of R2 if infinite
- List of opamps extended by AD8045
3.1.5 - Bugfix: selection of individual characteristic
- MSI files renamed
3.2 - Labeling of frequency response plot improved
- New: result can be printed (circuit and component values)
- New: some result dialog windows can be opened in parallel
(Component Values, Circuit, Filterparameters)
- New: user defined frequency marks can be added to the frequency response plot
- New: online check for update
- Twin-T notch filter: new algorithm for calculating the resistor values
- 3rd order Sallen-Key lowpass: new option 'All Capacitors equal'
- Bugfix: load specification
- List of supported opamps extended by LM4562, LME49710, LME49720, LME49740
- Print output of frequency response plot improved
- Menu improved (see menu items under 'Graphics')
- New: optional Key Disk enables the use of AktivFilter without registration
3.2.1 - Bugfix: save specification and result, especially under Windows XP
- Bugfix: Sallen-Key filter with gain of stage depends on Q
- List of opamps extended by OPA4820
3.2.2 - Bugfix: "Cancel" when save at exit the program
- List of supported opamps extended by OPA2354, OPA354, OPA4354
3.2.3 - Rounding of frequency marks improved
- Rounding at frequency conversion in the dialog for input of corner
frequencies of a bandpass improved
- Labeling of frequency axis of graphics improved
- List of supported opamps extended by LT6236, LT6237, LT6238, OPA2355, OPA2356,
OPA3355, OPA355, OPA356, THS4304
- Setup: default value of Key Disk question changed to No
3.2.4 - Response plot has thicker lines
3.2.5 - Bugfix: multiple-feedback highpass with given capacitor values
3.2.6 - New: user defined amplitude marks can be added to the frequency response plot
- Input fields extended in licence information dialog
3.2.7 - List of supported opamps extended by MC33079, TL971, TL972, TL974
3.2.8 - New: Filter parameters added to result file, and to printout (optional)
- List of supported opamps extended by ADA4528-1, ADA4528-2
3.2.9 - Bugfix: adjusting the stage gain of bandpass with very low quality
- Bugfix: 3rd order Sallen-Key lowpass-filter with gain < 6dB
3.2.10 - Bugfix: bandpass with very low quality
3.2.11 - Calculation of bandpass with very low quality improved
- List of supported opamps extended by OP-113, OP-213, OP-413
3.2.12 - Bugfix: bandpass with very low quality
3.2.13 - Bugfix: frequency markers
3.2.14 - List of supported opamps extended by FAN4174, FAN4274, LMH6657, LMH6658, TL022
3.3 - New circuit: 3rd order Sallen-Key highpass with 1 opamp
- List of opamps extended
3.3.1 - Calculation algorithm extended by pole check
- New: E192 standard values available
3.3.2 - Bugfix: multiple stage Sallen-Key highpass with given capacitor values
3.3.3 - Bugfix: display circuit of 3rd order Sallen-Key highpass with 1 opamp
- Start window and progress display centered
3.3.4 - Bugfix in message ("AktivFilter 3.2" -> "AktivFilter 3.3")
- SoftwareDidaktik replaced by Circuit Experts
3.3.5 - Algorithm for bandpass design improved
- List of supported opamps extended by AD8021, AD8061, AD8062, AD8063, AD829,
ADA4895-1, ADA4895-2, LMH6639, SN10501, SN10502, SN10503
3.3.6 - "infinite" removed from component values