Линейно-аналоговые умножители, делители

Analog multipliers take two or more analog signals and produce an output which is their product or the sum of multiple products. Such circuits can be used to implement related functions such as squares (apply same signal to both inputs) and square roots. Applications may include variable gain amplifiers, ring modulators, product detectors, mixers, gain control, true RMS converters, and pulse amplitude modulators (PAMs).