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- W4376134019 abstract "As the residue on the CDAC of a noise-shaping (NS) SAR ADC mainly contains quantization error $(mathrm{n}_{mathrm{q}})$ and comparator noise ($mathrm{n}_{text{comp}}$), it is desirable to reduce them simultaneously to boost the SNR by NS. However, reducing n <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>comp</inf> by 2x would increase the comparator’s power consumption by $sim 4mathrm{x}$. Therefore, many NS SAR ADCs adopt $8sim 10mathrm{~b}$ CDAC and low-power comparators for comparable $mathrm{nq}_{mathrm{q}}$ and n <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>comp</inf> . Then, the residue can be shaped by $1^{text{st}}$-order NS with high OSR (25) [1] or $4^{text{th}}$-order NS [2–3] to boost the SNR to over $85mathrm{~dB}$, at the price of limited input BW or increased circuit complexity. Although pipelined NS SAR or MASH suppress the last-stage n comp effectively, amplifying the preceding stage’s residue requires either power-hungry amplifier or dynamic amplifier with intense calibration [4]. Alternatively, LSB repeating can suppress $n_{text{comp}}$ power-efficiently [5]. The 78.4dB-SNDR NS SAR with 9bit CDAC in [6] suppress n <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>comp</inf> with 4-times LSB repeating and use the results to switch the CDAC after tri-level voting. However, the suppression effect of n <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>comp</inf> would be much limited for a precision CDAC (10 12bit) with more times LSB repeating, as it only translate the results into 3 different levels." @default.
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- W4376134019 date "2023-04-01" @default.
- W4376134019 modified "2023-09-30" @default.
- W4376134019 title "An 84dB-SNDR 1-0 Quasi-MASH NS SAR with LSB Repeating and 12-bit Bridge-Crossing Segmented CDAC" @default.
- W4376134019 doi "https://doi.org/10.1109/cicc57935.2023.10121259" @default.
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