History of the software AktivFilter
===================================

Version Description
-------------------

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: high- 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 amplification
        - 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 amplification

2.1b    - Bugfix: When frequency range has been changed (Menu: Options, Frequency range)
          the graphical output was wrong 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