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Co-time and co-frequency full-duplex (CCFD) is an effective technology with promising application prospect in improving the spectrum efficiency for wireless communication. However, it was viewed as impossible not too long ago for its sever self-interference. In this work, a novel intermediate frequency self-interference suppression solution with a symmetrical reconstruction path is proposed, based...
In this paper, the N-phase current driven passive mixer clocked by 1/N duty-cycle clocks is analyzed. The analysis shows that the N-phase passive mixer holds the property of impedance transformation, where it can frequency-translate baseband lowpass impedances into RF frequency to synthesize high-Q bandpass filters. This property can be used to replace the off-chip SAW filter in wireless receivers...
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...
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