Fully passive third-order noise shaping SAR ADC
Fully passive third-order noise shaping SAR ADC
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DOI：
10.1049/el.2017.0318
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发表时间：
2017-04
影响因子：
1.1
通讯作者：
Pedram Payandehnia;H. Mirzaie;Hamidreza Maghami;J. Muhlestein;G. Temes
中科院分区：
文献类型：
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作者：
Pedram Payandehnia;H. Mirzaie;Hamidreza Maghami;J. Muhlestein;G. Temes
本文提出了一种无运放噪声整形逐次逼近寄存器（SAR）ADC。三阶噪声整形通过实现二阶无源滤波器和无源误差反馈拓扑来实现。在该方案中，SAR误差信号（包括量化噪声，比较器热噪声，DAC热噪声和建立误差）进行三阶噪声整形。因此，可以放宽比较器的热噪声规格。此外，由于没有使用有源元件，所提出的方案实现了比早期SAR ADC更高的功率效率。
In this Letter, an opamp-free noise shaping successive-approximation register (SAR) ADC is proposed. Third-order noise shaping is achieved by implementing a second-order passive filter and a passive error feedback topology. In the proposed scheme, the SAR error signals (including quantisation noise, comparator thermal noise, DAC thermal noise and settling error) are subjected to third-order noise shaping. Therefore, the thermal noise specifications of the comparator can be relaxed. Also, since no active element is used, the proposed scheme achieves a higher power efficiency than earlier SAR ADCs.