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1、SOFTWARE SUMMARY “Fltrform.xls” Spreadsheet of Formulas“Fltrform.xls” is an EXCEL spreadsheet arranged by chapter that contains all the significant formulas in the chapter to simplify some of the calculations. By entering variables, the end result is precisely calculated, real time, so values can be
2、 optimized if desired. Simply copy this spreadsheet from the CD-ROM to your computer. “Filter Solutions” (book version) Software for Design of Elliptic Function Low-Pass FiltersPrevious editions of this book have contained extensive numerical tables of normalized values which have to be scaled to th
3、e operating frequencies and impedance levels during the design process. This is no longer the case.A program called Filter Solutions is included on the CD-ROM. This program is limited to Elliptic Function LC filters (up to N=10) and is a subset of the complete program, which is available from Nuhert
4、z Technologies (). The reader is encouraged to obtain the full version, which in addition to passive implementations covers many filter polynomial types and includes transmission line, active, switched capacitor, and digital along with many very powerful features, and has been integrated into Applie
5、d Wave Researchs (AWR) popular Microwave Office software.The program is quite intuitive and self-explanatory. The reader is encouraged to explore its many features on his/her own. Never-the-less all design examples using this program elaborate on its usage and provide helpful hints. The user can obt
6、ain transfer functions, pole-zero plots, reflection coefficients, step and impulse response and phase, group delay and attenuation plots versus frequency for each low-pass design up to a 10th order elliptic function low-pass.Extract and install this program by running FSBook.exe contained on CD-ROM.
7、 You can copy to desktop first.All examples in the book using Filter Solutions are based on starting with program default settings. To restore these settings click on Initialize button, then Default and then Save.“ELI 1.0” Program for Design of Odd-Order Elliptic function Low-Pass Filters up to 31st
8、 OrderThis program allows the design of odd-order elliptic function LC low-pass filters up to a complexity of 15 nulls (transmission zeros) or the 31st order. It is based on an algorithm developed by Amstutz1.The program inputs are Passband edge(Hz), Stopband edge (Hz), Number of nulls (up to 15), S
9、topband rejection in dB and Source and Load terminations (which are always equal). The output parameters are Critical Q (theoretical minimum Q), Passband ripple (dB), Nominal 3dB cutoff and a list of component values along with resonant null frequencies.To install the program, first copy ELI1.zip fr
10、om the CD-ROM to the desktop and then double-click and extract to the C: root directory or right-click on folder and “Extract All” to C:root directory . A folder “eli1” will be created in the C: root directory and a desktop shortcut “eli1.bat” will be created on the desktop (If not go to C:eli1 fold
11、er and create shortcut on desktop from “eli1.bat”)To run, double-click on “eli1.bat” shortcut and enter inputs as requested. Upon completing execution a dataout.text file will open using notepad and containing the resulting circuit description. 2 This text file can be printed out.1Amstutz,P., Ellipt
12、ic Approximation and Elliptic Filter Design on Small Computers ”,”IEEE Transactions on Circuits and Systems”, Vol. CAS-25,No.12, December 19782If the number of nulls is excessive for the response requirements (indicated by zero passband ripple) the final capacitor may have a negative value as a resu
13、lt of the algorithm. Reduce the number of nulls, increase the required attention or define a steeper filter, or a combination of these. “ FilterCAD 3.0” For Design of Switched Capacitor FiltersThis program from Linear Technology can help to quickly design a switched-capacitor filter from a set of in
14、put parameters and will then provide a schematic of the filter along with the predicted frequency response and time response. There are two basic modes of operation, Quick Design and Enhanced Design. Quick Design will guide you through a design similar in operation to a “wizard” where it will ask yo
15、u questions along the way. A design based on standard responses such as Butterworth, Bessel, Chebyshev and Elliptic polynomials will result. The Enhanced Design mode is more interactive allowing custom designs as well as standard polynomials. The user is encouraged to explore the various Help topics
16、 to gain more familiarity with this program. From time to time Linear Technology may update this program so it is also available from their website.There is a folder called FCAD on the CD-ROM. Copy this folder to the desktop, open the folder and double-click on SETUP.EXE. The program will then install. (see Start menu to access program).“TX Line” for Design of Microstrip, Stripline and Other Structures for Microwave FiltersThis very useful program from A
