An Algorithm to Evaluate Imbalances of Quadrature Mixers

Koji ASAMI  Michiaki ARAI  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E92-A   No.4   pp.1223-1229
Publication Date: 2009/04/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E92.A.1223
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Measurement Technology
Keyword: 
automatic test equipment,  quadrature mixer,  single side band signal,  Fourier transform,  

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Summary: 
It is essential, as bandwidths of wireless communications get wider, to evaluate the imbalances among quadrature mixer ports, in terms of carrier phase offset, IQ gain imbalance, and IQ skew. Because it is time consuming to separate skew, gain imbalance and carrier phase offset evaluation during test is often performed using a composite value, without separation of the imbalance factors. This paper describes an algorithm for enabling separation among quadrature mixer gain imbalance, carrier phase offset, and skew. Since the test time is reduced by the proposed method, it can be applied during high volume production testing.