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Leibnitz is the calculator you've always wanted (even if you didn't know it!), short of handwriting recognition.
FAQ: https://github.com/jafl/jx_application_framework/tree/master/programs/leibnitz#readme
ChangeLog: http://leibnitz.sourceforge.net/ChangeLog.html
RxCalc is a calculator for the analysis of multi-stage receiver.
RxCalc is a calculator for the analysis of multi-stage receiver. The software can calculate cascaded and system parameters: gain, noise, sensitivity, input and output P1dB and IP3, noise floor, spur-free dynamic range, MDS, SNR, and others.
Sources code: https://github.com/arhiv6/rxcalc
Binary package: http://sourceforge.net/projects/rxcalc/
This program used Remez exchange (equiripple) algorithm calculate a FIR filter coefficients and then convert to integer for FPGA, DSP or MCU.
Additionally, it can be design a simple IIR notch filter for reduce power line interfere.
You can run in the following way. Good luck!
'atlc' is a CAD package used for analysing and desiging electrical transmission lines of arbitrary cross section. Also for the design of directonal couplers. Some parts are CPU intensive, so multiple CPUs are supported.
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mcalc is a javascript based microstrip analysis/synthesis calculator. The tool is very easy to use and is fairly accurate. Compared to typical online tools, mcalc uses state of the art equations for the analysis which provides the best accuracy availabl
Transcalc is an analysis and synthesis tool for calculating the electrical and physical properties of different kinds of RF and microwave transmission lines. Transcalc is built using the GIMP toolkit (GTK+) for its GUI interface.