R&S FSL WLAN TX Measurements (Option K91)
1300.2519.12 2.141 E-11
Quadrature Error
An ideal I/Q modulator sets the phase angle to exactly 90 degrees. With a quadrature error, the phase
angle between the I and Q vector deviates from the ideal 90 degrees, the amplitudes of both
components are of the same size. In the vector diagram, the quadrature error causes the coordinate
system to shift.
A positive quadrature error means a phase angle greater than 90 degrees:
A negative quadrature error means a phase angle less than 90 degrees:
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