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Nonlinear Analysis of Bipolar Harmonic Mixer for Direct Conversion Receivers
Hiroshi TANIMOTO Ryuta ITO Takafumi YAMAJI
Publication
IEICE TRANSACTIONS on Electronics
Vol.E88C
No.6
pp.12031211 Publication Date: 2005/06/01 Online ISSN:
DOI: 10.1093/ietele/e88c.6.1203 Print ISSN: 09168516 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, selfmixing, dc offset, noise analysis, cyclostationary noise,
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Summary:
An evenharmonic mixer using a bipolar differential pair (bipolar harmonic mixer;BHMIX) is theoretically analyzed from the direct conversion point of view; i.e, conversion gain, thirdorder input intercept point (IIP3), selfmixing induced dc offset level, and secondorder input intercept point (IIP2). Also, noise are analyzed based on nonlinear largesignal 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.

