A 320-MHz four-paths bandpass sigma-delta modulator

Centuori, Alfonso; Gatti, U.; Malcovati, P.; Maloberti, F.

doi:10.1109/imtc.2002.1006892

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…The use of modulators in a multipath architecture leads to interesting features [6]. Namely, a multipath architecture implements a bandpass response by using low-pass modulators in the single paths (Fig.…”

Section: Multipath Modulatormentioning

confidence: 99%

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Gain and Offset Mismatch Calibration in Time-Interleaved Multipath A/D Sigma–Delta Modulators

Ferragina

Fornasari

Gatti

et al. 2004

IEEE Trans. Circuits Syst. I

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In this paper, we propose a digital background adaptive calibration technique for correcting offset and gain mismatches in time-interleaved multipath analog-digital (A/D) sigma-delta (61) modulators. The proposed technique allows us to cancel the spurious tones introduced by offset and gain mismatches among the paths only by processing the digital output, without interfering with the operation of the modulator. This solution is also effective for any other time-interleaved A/D converter topology. Simulation results on a high-performance four-path bandpass 61 modulator, operating on a 5-MHz band at a clock frequency of 320 MHz, demonstrate the effectiveness of the proposed calibration technique, which allows us to achieve significant improvements of the signal-to-noise ratio and the spurious-free dynamic range in the presence of mismatches.

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Section: Multipath Modulatormentioning

confidence: 99%

“…The architecture of the single-path modulator was studied previously and discussed in [6]. However, unfortunately, multipath modulators suffer from the typical time-interleaved ADC drawbacks.…”

Section: Multipath Modulatormentioning

confidence: 99%

Gain and Offset Mismatch Calibration in Time-Interleaved Multipath A/D Sigma–Delta Modulators

Ferragina

Fornasari

Gatti

et al. 2004

IEEE Trans. Circuits Syst. I

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show abstract

“…Vincenzo Ferragina (1,2) , Andrea Fornasari (1) , Umberto Gatti (4) , Piero Malcovati (1) Franco Maloberti (1,3) and Luigi Monfasani (1) …”

Section: Use Of Dynamic Element Matching In a Multi-path Sigma-delta unclassified

“…Using sigma-delta (Σ∆) modulators in the single path ( Fig. 2b shows the architecture) leads to the following benefit [2]: multiplexing at the output the oversampled bitstreams leads to a band-pass total transfer function exactly as when using the Nyquist-rate decimated signals. Moreover, since the sensitive to component mismatch of the lowpass Σ∆ modulators is pretty low, dynamic range and stability are an affordable issue.…”

Section: Introductionmentioning

confidence: 99%