|ElecFilDes Related Article||A Short History of Electronic Filters|
|ElecFilDes Related Article||ElecFilDes Brochure|
|ElecFilDes Related Article||Design and Implement Any Digital Filter in 60 Seconds with ElecFilDes and Freescale MC56F8400 Evaluation Board|
|ElecFilDes Related Article||Design of RF Directional Couplers|
|Motorola||Phase Locked Loop Application Note|
|Freescale||MC56F8400 Evaluation Board for Implementing ElecFilDes FIR and IIR Filters|
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Elliptic filters with arbitrary source and load resistances (up to order 9)
Elliptic filters, evenly terminated, up to order 20
Lowpass, bandpass, bandstop, and highpass configurations
Allows canonical transforms on various passive filter sections.
Includes image parameter passive filter design utility.
Includes Butterworth and Tchebyscheff passive filters.
Generates PSPICE file for independent verification of all active and passive filters.
Generates source code for MC56F84789 DSP for FIR and IIR filters.
Limited to order 20 for IIR and length 512 for FIR filters.
Limited to A/D sampling rates from 1 sample/sec to 100K samples/second.
32 bit arithmetic allows for ultra high Q audio filters with less than 1Hz bandpass to stopband transition.
Proprietary algorithm allows for IIR bandpass and bandstop filters with no anomolies.
Provides for real time implementation of FIR and IIR digital filters on MC56F8400 development board.
Various window design of FIR filters including rectangular, triangular, Hamming, Hanning, generalized Hamming, and Kaiser.
Remez exchange algorithm for FIR equiripple filters to length 512.
Numerous equations are shown analytically for educational purposes including
Displays the input impedance equation set for unevenly terminated elliptic filters lowpass prototypes.
Displays the magnitude squared function for the lowpass prototype filters.
Shows the transfer functions for analog filters.
Displays poles and zeros for all analog and IIR filters.
Shows the DSP assembly code for FIR and IIR filters.
Provides the step and impulse response equations from the inverse Laplace transform utility.
Shows the equations for the canonical transform of passive filter sections.
Lowpass to bandpass, bandstop, and highpass transforms equations for analog filters are displayed.
Generates Martin & Sedra switched capacitor biquads based on the bi-linear transform.
RF directional coupler design
Resistive pad design
Pspice (student version from Orcad) and LTspice (from Linear Tech) are license free software packages that can be used to simulate and verify the active and passive designs of ElecFilDes. Codewarrior 10.6 is a license free package from Freescale used to compile the assembly language files generated by ElecFilDes for IIR and FIR filters.
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