A
comprehensive collection of RF &
microwave resources for wireless
communication engineers. Includes
tutorials, theory, design aids, circuit
diagrams, products, and more.
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& Microwave Resources Directory.
Active
Filter Wizard- Free online program for
designing several types of active
filters, including low-pass, bandpass,
and high-pass, with Bessel, Butterworth,
Chebychev, inverse Chebychev, or
elliptical passband responses. You can
even choose the specific op-amp to use,
or a generic, and then plot the resulting
frequency response based upon the op-amp
characteristics.
Active
Filter Design Techniques (PDF)- Gives theory behind the design
of active filters. Covers not only the
usual Butterworth, Bessel, and Chebychev
implementations, but also the Sallen-Key,
Twin-T, and Wien-Robinson. (Texas
Instruments Application Report SLOA088.)
More
Filter Design on a Budget (PDF)- A very handy, concise summary
of several active filter designs and
types, including low-pass, band-pass,
high-pass, band-reject, and notch.
Focuses primarily on the Sallen-Key and
multiple feedback (MFB) implementations,
but also covers the Deliyannis and the
Fliege topologies. (Texas Instruments
Application Report SLOA096.)
FDI
Online Design Guide -
Frequency Device's guide to passive,
active, and digital filter design
techniques.
Active
Filter Wizard- Free online program for
designing several types of active
filters, and plotting the resulting
frequency response. Doesn't teach design
techniques or theory, but a fun and
useful learning tool nevertheless.
Active
Low-Pass Filter Design- By Jim Karki. Comprehensive
overview of the design process, from
Laplacian mathematics to final design
tables. Covers the Bessel, Butterworth,
and Chebyshev realizations in both the
Sallen-Key and multiple-feedback (MFB)
configurations.. (Texas Instruments
Application Report SLOA049A.)
Active
Filter Design Techniques (PDF)- Gives theory behind the design
of active filters. Covers not only the
usual Butterworth, Bessel, and Chebychev
implementations, but also the Sallen-Key,
Twin-T, and Wien-Robinson.
Active
Filter Wizard- Free online program for
designing several types of active
filters, including low-pass, bandpass,
and high-pass, with Bessel, Butterworth,
Chebychev, inverse Chebychev, or
elliptical passband responses. You can
even choose the specific op-amp to use,
or a generic, and then plot the resulting
frequency response based upon the op-amp
characteristics.
Active
Low-Pass Filter Design and Dimensioning- This free online utility,
written in JavaScript, helps you to
quickly design an active Sallen-Key or
Multiple Feedback topology low-pass
filter.
A
Filter Primer -
Maxim's general filter tutorial
demonstrating Laplace pole-zero analysis,
covering Butterworth, Bessel, Chebychev,
Elliptic, and state-variable
implementations. Doesn't cover active
filters specifically.
FDI
Online Design Guide -
Frequency Device's comprehensive tutorial
for passive, active, and digital filters.
Poles
and Zeros- Online interactive program
that allows you to move the Laplace poles
and zeros of a two-pole filter and view
the resulting transfer function
(frequency response), and then create a
3D s-domain plot. A fun learning tool.
