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An 8-bit 180-kS/s differential SAR ADC with a time-domain comparator and 7.97-ENOB

Fan Hua, Wei Qi, Kobenge Sekedi Bomeh, Yin Xiumei and Yang Huazhong

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Abstract: This paper presents a differential successive approximation register analog-to-digital converter (SAR ADC) with a novel time-domain comparator design for wireless sensor networks. The prototype chip has been implemented in the UMC 0.18-μm 1P6M CMOS process. The proposed ADC achieves a peak ENOB of 7.98 at an input frequency of 39.7 kHz and sampling rate of 180 kHz. With the Nyquist input frequency, 68.49-dB SFDR, 7.97-ENOB is achieved. A simple quadrate layout is adopted to ease the routing complexity of the common-centroid symmetry layout. The ADC maintains a maximum differential nonlinearity of less than 0.08 LSB and integral nonlinearity less than 0.34 LSB by this type of layout.

Key words: successive approximation registertime-domain comparatoranalog-to-digital converter

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    Received: 18 August 2015 Revised: Online: Published: 01 September 2010

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      Fan Hua, Wei Qi, Kobenge Sekedi Bomeh, Yin Xiumei, Yang Huazhong. An 8-bit 180-kS/s differential SAR ADC with a time-domain comparator and 7.97-ENOB[J]. Journal of Semiconductors, 2010, 31(9): 095011. doi: 10.1088/1674-4926/31/9/095011 Fan H, Wei Q, Kobenge S B, Yin X M, Yang H Z. An 8-bit 180-kS/s differential SAR ADC with a time-domain comparator and 7.97-ENOB[J]. J. Semicond., 2010, 31(9): 095011. doi:  10.1088/1674-4926/31/9/095011.Export: BibTex EndNote
      Citation:
      Fan Hua, Wei Qi, Kobenge Sekedi Bomeh, Yin Xiumei, Yang Huazhong. An 8-bit 180-kS/s differential SAR ADC with a time-domain comparator and 7.97-ENOB[J]. Journal of Semiconductors, 2010, 31(9): 095011. doi: 10.1088/1674-4926/31/9/095011

      Fan H, Wei Q, Kobenge S B, Yin X M, Yang H Z. An 8-bit 180-kS/s differential SAR ADC with a time-domain comparator and 7.97-ENOB[J]. J. Semicond., 2010, 31(9): 095011. doi:  10.1088/1674-4926/31/9/095011.
      Export: BibTex EndNote

      An 8-bit 180-kS/s differential SAR ADC with a time-domain comparator and 7.97-ENOB

      doi: 10.1088/1674-4926/31/9/095011
      • Received Date: 2015-08-18

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