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Rohde & Schwarz

dB or not dB?

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True or false: 30 dBm + 30 dBm = 60 dBm? Why does 1% work out to be -40 dB one time but then 0.1 dB or 0.05 dB the next time? These questions sometimes leave even experienced engineers scratching their heads. Decibels are found everywhere, including power levels, voltages, reflection coefficients, noise figures, field strengths and more. What is a decibel and how should we use it in our calculations? This Application Note is intended as a refresher on the subject of decibels.

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Test & Measurement, Components, Embedded, Power, Industrial, Communication, Resistors, SMD passives, Capacitors, Inductors, Connectors, Switches, Batteries, Wireless testing, Wireless networking ICs and modules, Near-Field Communication (NFC), Sub-GHz/ISM-band radio, Cellular, LPWAN technologies, Transformers, PCB-substrate technology, Microcontrollers, Development and debug tools, Evaluation boards, SBCs and modules, Embedded operating systems and software, Edge computing, Industry 4.0 technology, Industrial networking, ATEX equipment and design, PLCs and industrial computers, Electronic safety systems, Sensing and automation, IIoT, Power semiconductors, Power supplies and converters/inverters, LDOs, Power modules, Switched-mode converters, Magnetics and wound components, Distributed power, Digital/software-defined power, Motor control, Energy harvesting, Protection Devices, Laboratory/bench equipment, Automated test equipment, Field-test equipment, Boundary scan equipment, Test probes and pins, Test software, cooling

 

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