R&S®DB CALCULATOR Application Note
■30 dBm + 30dBm = 60dBm? It is well known that it is not as easy as that. If we convert these logarithmic power levels to linear values, we get 1W + 1 W = 2 W. This is 33 dBm and not 60 dBm. In addition, already, we face some trouble: we just want to do a simple calculation, but we need to start thinking about the correct formulas and we need to start converting values. In fact, this is not difficult, but it can be annoying.
■This application note can be regarded as a spin-off of the widely read application note “dB or not dB?” [1]. As an extension to “dB or not dB?” this application note supplies a software tool that can do a variety of calculations for you. For example, this software can be used to add or subtract an arbitrary number of powers, convert power and voltage units from the linear to the logarithmic scale (and vice versa), convert linear power and voltage ratios to decibels, and convert a voltage standing wave ratio (VSWR) to other linear and logarithmic reflection quantities.
■In detail, this application software comprises five independent calculation tools:
●dBm Calculator:
◆This tool helps to add or subtract powers expressed in wattsor expressed as power levels in dBm.
●Voltage Calculator:
◆This tool helps to add RMS voltages.
●Unit Converter:
◆This tool converts power units and voltage units.
●dB Converter:
◆This tool converts a linear power or voltage ratio to dB.
●VSWR Converter:
◆This tool converts between different reflection quantities such as VSWR and return loss.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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10.2021 |
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Version 8e |
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1GP77 |
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1.6 MB |
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