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: 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 3.3.7 - Code signing added