What is in-phase and quadrature of signal?
In-Phase and Quadrature
In any event, “in-phase” and “quadrature” refer to two sinusoids that have the same frequency and are 90° out of phase. By convention, the I signal is a cosine waveform, and the Q signal is a sine waveform.
What are I and Q signals?
The terms I-component and Q-component are common ways of referring to the in-phase and quadrature signals. Both signals comprise a high-frequency sinusoid (or carrier) that is amplitude-modulated by a relatively low-frequency function, usually conveying some sort of information.
How does IQ modulation work?
An IQ modulator is a device that converts baseband information into RF signals. Internally, two double-balanced mixers are combined as shown below. By modulating with both in-phase (I) and quadrature (Q) inputs, any arbitrary output amplitude and phase can be selected.