FiltersCAD

FiltersCAD is a comprehensive PC based filter synthesis software package (32-Bit GUI for Windows95/98/ME/NT 4.x/2000/XP). FiltersCAD provides active circuit synthesis with PSpice *.cir netlist generation.
FiltersCAD includes the following files and documents:
- FiltersCAD (fc.exe). Enables you to create and edit design files, to compute filters, PSpice simulation test, and export spice netlist files.
- Help Author's Guide (fc.hlp). Describes how to design filters by using FiltersCAD.
- Samples files (<INSTALLDIR>samples). Enables you to see designed filters example.

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FilterLab allows the design of low-pass filters up to an 8th order filter with Chebyshev, Bessel or Butterworth responses from frequencies of 0.1 Hz to 10 MHz. Users can select a flat passband or sharp transition from passband to stopband. Options, such as minimum ripple factor, sharp transition and linear phase delay, are available. Once the filter response has been identified, FilterLab generates the frequency response and the circuit. For maximum design flexibility, changes in capacitor values can be implemented to fit the demands of the application. FilterLab will recalculate all values to meet the desired response, allowing real-world values to be substituted or changed as part of the design process.

Strongly Recommended by the Analog Weenies at WebEE

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With SuperFilter you can:

Design the following classical analogue filter types, in both active and passive forms

• Butterworth
• Chebyshev
• Elliptical
• Bessel

Realise Digital filters as:

• IIR Recursive designs
• FIR Non Recursive designs

Describe your designs using

• pole-zero description
• filter order and cut off
• pass band and stop band

See the frequency and transient response of all your filter designs

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A computer aided design program for creating filters with Linear Technology's filter ICs. FCAD is designed to help users without special expertise in filter design to design good filters with a minimum of effort. It can also help experienced filter designers achieve better results by providing the ability to play "what if" with the configuration and values of various components and observe the results. With FCAD, you can design lowpass, highpass, bandpass and notch filters with a variety of responses, including Butterworth, Bessel, Chebychev, elliptic and minimum Q elliptic, in addition to custom responses.

FGEN computes the filter coefficients of FIR digital filters. There are four types of digital filters: Lowpass, Highpass, Bandpass, and Bandstop. The number of taps can take any odd value in the range of 3 to 511. Lower limits apply to all filter types. Upper limits apply only to bandpass and bandstop filters. There are four types of windowing: Blackman, Hamming, von Hann, and Rectangular.

Under the file menu option, you can copy and view the filter coefficients.