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How to use rotating phasor measure I/Q imbalance?

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hmsheng

hmsheng

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In the following paper, rotating phasor is used to measure I/Q modulator's phase imbalance. But I don't know how it works.
Can anyone tell me the principle?

Faulkner, M. etc
Automatic adjustment of quadrature modulators
Electron. Lett., Jan. 1991, 27, pp.214-216
 

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