Discussion
Analog multiplication is carried out with
Answer: D
Analog multiplication is carried out with a logarithmic amplifier, option (D). The method takes the logarithms of the two inputs, adds them in a summing amplifier, and then takes the antilogarithm of the sum with an exponential amplifier, since \(\log(xy) = \log x + \log y\). The passage names the logarithmic amplifier among the functions of an op-amp. A precision rectifier, option (B), only rectifies small signals. A sample-and-hold circuit, option (C), stores a voltage. Option (A), scalar, is not a circuit used for multiplication of two signals.
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