In-phase and quadrature components

Example of how an angle-modulated sinusoid can be decomposed into or synthesized from two amplitude-modulated sinusoids.

When a sinusoidal voltage is applied to either a simple capacitor or inductor, the resultant current that flows is

In electrical engineering, a sinusoid with angle modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are offset in phase by one-quarter cycle (π/2 radians). All three functions have the same frequency. The amplitude modulated sinusoids are known as in-phase and quadrature components. Some authors find it more convenient to refer to only the amplitude modulation (baseband) itself by those terms.

单词	Quadrature phase
释义	Quadrature phase 英语百科 In-phase and quadrature components In electrical engineering, a sinusoid with angle modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are offset in phase by one-quarter cycle (π/2 radians). All three functions have the same frequency. The amplitude modulated sinusoids are known as in-phase and quadrature components. Some authors find it more convenient to refer to only the amplitude modulation (baseband) itself by those terms.
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Quadrature phase

In-phase and quadrature components