In contrast, linear circuit elements as resistors, capacitors, and inductors can be specified by a single number ( resistance, capacitance, inductance, respectively ).
2.
In RF band detection, typically, the electromagnetic field drives oscillatory motion of electrons in an antenna; the captured EMF is subsequently electronically mixed with a local oscillator ( LO ) by any convenient non-linear circuit element with a quadratic term ( most commonly a rectifier ).
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