Nonlinear Analysis of Bipolar Harmonic Mixer for Direct Conversion Receivers

Hiroshi TANIMOTO  Ryuta ITO  Takafumi YAMAJI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.6   pp.1203-1211
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.6.1203
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: RF
Keyword: 
harmonic mixer,  BHMIX,  theoretical analysis,  down conversion mixer,  conversion gain,  IIP3,  IIP2,  self-mixing,  dc offset,  noise analysis,  cyclostationary noise,  

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Summary: 
An even-harmonic mixer using a bipolar differential pair (bipolar harmonic mixer;BHMIX) is theoretically analyzed from the direct conversion point of view; i.e, conversion gain, third-order input intercept point (IIP3), self-mixing induced dc offset level, and second-order input intercept point (IIP2). Also, noise are analyzed based on nonlinear large-signal model, and numerical results are given. Noises are treated as cyclostationary noises, thus all the folding effects are taken into account. Factors determining IIP3, IIP2, dc offset, and noise are identified and estimation procedures for these characteristics are obtained. For example, design guidelines for the optimal noise performance are given. Measured results support all the analysis results, and they are very useful in the practical BHMIX design.