Suppose one wishes to multiply two voltage or current signals, which may not be completely DC. It is OK for the product to be scaled down in order to avoid the use of transistors and complicating the circuit.
Is there any simple circuit that does the multiplication? How would the result diverge from the ideal value, even considering scaling down? If the transistors cannot be avoided, how divergent is the result of transistor-using multiplier different from the ideal multiplication?
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