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An absolute measure of power is the dBm scale in which power is specified in decibels relative to one milliwatt Specifically PdBm 10 log10 PmW1 mW Suppose that a receiver is rated as

An absolute measure of power is the dBm scale, in which power is specified in decibels relative to one milliwatt. Specifically, P(dBm) = 10 log10[P(mW)/1 mW]. Suppose that a receiver is rated as having a sensitivity of −20 dBm, indicating the mimimum power that it must receive in order to adequately interpret the transmitted electronic data. Suppose this receiver is at the load end of a 50-Ω transmission line having 100-m length and loss rating of 0.09 dB/m. The receiver impedance is 75Ω, and so is not matched to the line. What is the minimum required input power to the line in (a) dBm, (b) mW?

Jun 14 2020 View more View Less

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