Signal

Detecting I/Q imbalance

Detecting I/Q imbalance
  1. What are the I and Q signals?
  2. What is IQ correction?
  3. What is IQ gain?

What are the I and Q signals?

The capital letter I represents the amplitude of the in-phase signal, and the capital letter Q represents the amplitude of the quadrature signal. Interesting things happen when you look at adding quadrature signals together. If I=1 and Q=0, then you would simply have the cosine wave (phase equal to 0).

What is IQ correction?

Math of I/Q Correction

is the baseband frequency of the tone. However, due to the different channel environments and component properties, there is usually DC bias, as well as the offset on the phase and the amplitude, which makes the two signals as following: and.

What is IQ gain?

IQ Gain Imbalance indicates the amount of amplifier gain imbalance between I and Q. For example, a value of -6.02 dB means the Q signal is being amplified twice as much as the I signal. This measurement is expressed in dB and calculated over the data in the Measurement Interval.

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