Service manual

WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
46Operating Manual 1176.7649.02 ─ 04
3.8.1.3 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:
Measurement Result Types