In this paper, a second-order discrete-time (DT) modulator for 8-channel Incremental Sigma-Delta analog-to-digital converter (IADC) is presented for biomedical applications ranging from kHz. The proposed DT modulator with input bandwidth of 25$$kHz on each channel is sampled at 51.2$$MHz, with oversampling ratio of 128 implemented at 180$$nm technology. The proposed IADC has high resolution, multichannel A/D conversion, simple architecture, low offset, low gain error and low area over the standard ADCs available. Measured results show that the SNR, DR, ENOB, power consumption and chip area of the proposed IADC are 63.9$$dB, 62.2$$dB, 10.11 bits, 0.832$$mW and 0.032$$mm², respectively, at 1.8V power supply. For testing purpose, the noncoherent sampling is done to get the FFT plot of the output signal. For further validation, the proposed second-order IADC was also designed and compared in MATLAB/Simulink.

在本文中，提出了一种用于 8 通道增量 Sigma-Delta 模数转换器 (IADC) 的二阶离散时间 (DT) 调制器，适用于 kHz 范围内的生物医学应用。所提出的输入带宽为 25 的 DT 调制器$$每个通道上的 kHz 以 51.2 采样$$MHz，在 180 时实现了 128 的过采样率$$纳米技术。与可用的标准 ADC 相比，建议的 IADC 具有高分辨率、多通道 A/D 转换、简单的架构、低失调、低增益误差和小面积。测量结果表明，所提出的 IADC 的 SNR、DR、ENOB、功耗和芯片面积为 63.9$$分贝，62.2$$分贝，10.11 位，0.832$$毫瓦和 0.032$$mm ²，分别在1.8V供电。出于测试目的，进行非相干采样以获得输出信号的 FFT 图。为了进一步验证，还设计了所提出的二阶 IADC，并在 MATLAB/Simulink 中进行了比较。