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What is dBm used to measure in terms of decibels?(a) Peak amplitude of a signal(b) Power relative to 1mW(c) Amplitude of a signal(d) Volume unitThis question was posed to me by my school principal while I was bunking the class.I'd like to ask this question from The Decibel topic in division Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer»

The CORRECT option is (c) Amplitude of a signal

The explanation is: We use dBm to measure the POWER relative to 1mW. It is generally compared relative to a 600Ω IMPEDANCE, which EQUATES to a voltage level of 0.775V. The m stands for milliwatts. The DERIVATE dBm0 stands for dBm measured at zero transmission level point.



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