In this brief, a 300-mV, auto shutdown comparator based on a novel clock gating network is proposed. The proposed auto shutdown comparator is further employed to realize a compact, ultralow power continuous-time $\Delta \Sigma $ modulator (CTDSM) with a 300-mV supply voltage for multichannel sensing and biomedical applications. The design was fabricated in standard mixed-mode 180-nm CMOS process. Measurement results show that the CTDSM achieves a peak SNDR of 54.81 dB and DR of 57.4 dB while consuming a core power of $1.76~\mu \text{W}$ at 300-mV supply voltage without the clock-gated comparator. With the clock-gated auto shutdown comparator, the CTDSM consumes a core power of only 220 nW thereby providing an eight times power saving. Moreover, the fabricated CTDSM occupies an extremely small area of 0.0464 mm² with an energy efficiency of 24.5 fJ/conv making it the most compact and energy-efficient CTDSM reported till date among the moderate resolution CTDSMs. Furthermore, by increasing the supply voltage to 400 mV, the CTDSM features a peak SNDR of 58.56 dB and DR of 64.1 dB while consuming a core power of 410 nW and 29.61 fJ/conv.

中文翻译：

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基于 300mV 自动关断比较器的连续时间 ΔΣ 调制器

在这个简介中，提出了一种基于新型时钟门控网络的 300mV 自动关断比较器。进一步采用建议的自动关断比较器来实现紧凑、超低功耗的连续时间 $\Delta \Sigma $ 具有 300 mV 电源电压的调制器 (CTDSM)，适用于多通道传感和生物医学应用。该设计采用标准混合模式 180 纳米 CMOS 工艺制造。测量结果表明，CTDSM 实现了 54.81 dB 的峰值 SNDR 和 57.4 dB 的 DR，同时消耗了一个核心功率 $1.76~\mu \text{W}$ 在 300mV 电源电压下，没有时钟门控比较器。借助时钟门控自动关断比较器，CTDSM 仅消耗 220 nW 的内核功率，从而节省了八倍的功率。此外，制造的 CTDSM 占据了 0.0464 mm ^{2 的}极小面积，能量效率为 24.5 fJ/conv，使其成为迄今为止报道的中等分辨率 CTDSM 中最紧凑、最节能的 CTDSM。此外，通过将电源电压增加到 400 mV，CTDSM 具有 58.56 dB 的峰值 SNDR 和 64.1 dB 的 DR，同时消耗 410 nW 和 29.61 fJ/conv 的核心功率。