A high-pass sigma–delta modulator (HPSDM) is proposed for electrocardiography (ECG) signal acquisition system. The HPSDM is implemented using operational amplifier (op-amp) sharing and programmable feedforward coefficients. The op-amp sharing is adopted to reduce the quantity of amplifiers because they dominate the power consumption of the HPSDM. In addition, given that the magnitude of the ECG is dependent on different persons, programmable feedforward coefficients are utilized to extend the dynamic range of the HPSDM to fit the actual application. The proposed HPSDM is fabricated in a 0.18-μm standard CMOS process. Measurement results reveal that the proposed HPSDM has a signal-to-noise and distortion ratio (SNDR) of 54.5 dB and a power consumption of 2.25 μW under a 1.2 V supply voltage and achieves a figure of merit (FoM) of 12.96 pJ/conv. Moreover, the proposed HPSDM has an SNDR of 64.8 dB and a power consumption of 5.2 μW under a 1.8 V supply voltage and achieves a FoM of 9.15 pJ/conv due to the op-amp sharing technique. Under the 1.2 V and 1.8 V supply voltages, the dynamic range of the HPSDM is extended to approximately 12 dB due to the technique of programmable feedforward coefficients.

中文翻译：

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具有运算放大器共享和可编程前馈系数技术的高通Sigma-elta调制器用于心电信号采集


提出了一种用于心电图（ECG）信号采集系统的高通Σ-Δ调制器（HPSDM）。 HPSDM 使用运算放大器 (op-amp) 共享和可编程前馈系数来实现。由于放大器在HPSDM的功耗中占主导地位，因此采用运算放大器共享来减少放大器的数量。此外，考虑到心电图的幅度取决于不同的人，利用可编程前馈系数来扩展HPSDM的动态范围以适应实际应用。所提出的 HPSDM 采用 0.18μm 标准 CMOS 工艺制造。测量结果表明，所提出的 HPSDM 在 1.2 V 电源电压下具有 54.5 dB 的信噪比和失真比 (SNDR)，功耗为 2.25 μW，并实现了 12.96 pJ/con 的品质因数 (FoM) 。此外，所提出的 HPSDM 在 1.8 V 电源电压下具有 64.8 dB 的 SNDR 和 5.2 μW 的功耗，并且由于运算放大器共享技术而实现了 9.15 pJ/conv 的 FoM。在1.2 V和1.8 V电源电压下，由于采用了可编程前馈系数技术，HPSDM的动态范围扩展到大约12 dB。