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Analysis and Optimization of Direct-Conversion Receivers With 25% Duty-Cycle Current-Driven Passive Mixers

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4 Author(s)
Mirzaei, A. ; Broadcom Corp., Irvine, CA, USA ; Darabi, H. ; Leete, J.C. ; Yuyu Chang

The performance of zero-IF receivers with current-driven passive mixers driven by 25% duty-cycle quadrature clocks is studied and analyzed. It is shown that, in general, these receivers outperform the ones that utilize passive mixers with 50% duty-cycle clocks. The known problems in receivers with 50% duty-cycle mixers, such as having unequal high- and low-side conversion gains, unexpected IIP2 and IIP3 numbers, and IQ crosstalk, are significantly lowered due to the operating principles of the 25% duty-cycle passive mixer. It is revealed that with an intelligent sizing of the design parameters, the 25%-duty-cycle-mixer-based receiver is superior in terms of linearity, noise, and elimination of IQ crosstalk.

Published in:

Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:57 ,  Issue: 9 )

Date of Publication:

Sept. 2010

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