The root mean square (rms) is a fundamental measurement of the magnitude of an ac signal. Defined practically, the rms value assigned to the ac signal is the amount of dc required to produce an equivalent amount of heat in the same load. Defined mathematically, the rms value of a voltage is defined as the value obtained by squaring the signal, taking the average, and then taking the square root. The averaging time must be sufficiently long to allow filtering at the lowest frequencies of operation desired. We will show a few examples of how efficiently analog circuits can perform this function. More details of rms-to-dc converters can be found in Reference 1.
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