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Signal-to-Noise Ratio (SNR)

Signal-to-noise ratio is the difference between the relative strengths of the noise floor power level and the intended signal power level.

Total noise power is a combination of thermal noise and any noise added by the system. Higher signal-to-noise values are better since there is less of a probability that signal corruption and data errors will occur.

SNRrx = Prx - 10 log ( k Ta B )  { dB }
where: SNRrx = signal-to-noise ratio at detector ( dB )
k = Boltzmann's constant = 1.380 · 10-23 ( J/K )
Ta = ambient temperature ( K )
B = receiver bandwidth at detector ( Hz )

RF Cafe Software

RF Cascade Workbook
 RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

Smith Chart™ for Excel
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