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A quadrature \boldsymbolSigmaΔ analog-to-digital converter (ADC) is a promising solution for intermediate frequency digitizing software defined cognitive radio (CR) receivers because of, e.g., multiband capability and power efficiency. However, inherent coefficient mismatches between the in-phase and quadrature rails can severely damage the performance of such receiver by creating mirror-frequency...
In this article, a novel analytical closed-form model is derived for second-order quadrature ΣΔ modulators (QΣΔM) taking implementation inaccuracies of QΣΔM coefficients into account. The model enables analytical examination of the modulator I/Q imbalance effects on input-output relation as well as signal and noise transfer functions (STF and NTF) independently. Thus, the image rejection of the QΣΔM...
In this article, the design and analysis of sophisticated multi-band quadrature ΣΔ modulators (QΣΔM) are addressed, offering a high-performance and easily-reconfigurable solution for the analog-to-digital (A/D) interface of cognitive radio receivers. Based on spectrum sensing information, the multi-band principle stemming from multi-stage converter implementation enables multiple reconfigurable noise...
This article focuses on the in-phase/quadrature (I/Q) imbalance problem in quadrature ΣΔ modulators (QΣΔM). In the literature, such quadrature modulators have been seen as a promising possibility for software defined radio (SDR) receivers, but matching the quadrature circuits is an inevitable problem for this kind of systems. In this article, an analytic closed-form model will be derived for a mismatched...
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