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Micromachines, Volume 14, Issue 2
February 2023 - 263 articles
Cover Story: This brief proposes a signal-independent background calibration in pipeline-SAR ADCs with a convergence-accelerated technique. To achieve signal independence, an auxiliary capacitor array CA is introduced to pre-inject a pseudo-random noise (PN) in the sampling phase to cancel out the opposite PN injection of the calibrated capacitor in the conversion phase, and CA is also used to realize the D/A function of the calibrated capacitor in the conversion phase. Additionally, the first sub-ADC is designed with extended conversion bits to quantize its own residue after delivering the conversion bits required by the first stage. Afterwards, this result is provided to the calibration algorithm to reduce the signal component and accelerate convergence. View this paper
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Micromachines - ISSN 2072-666X