@inproceedings{0541753c49ac49fd931fc535b59043d0,
title = "A VCO-Based 2nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems",
abstract = "This paper proposes a voltage-controlled oscillator (VCO)-based 2\{mathrm\{n\}mathrm\{d\}\}-order continuous-time delta-sigma modulator (CTSDM) for current-sensing readout systems. The proposed VCO-based CTSDM can immediately quantize the current signal from sensor without pre-amplifier. A proportional-integral (PI) structure has been realized by injecting a resistor in series with the integrating capacitor to simplify the circuit complexity as well as maintain the system stability. A noise shaping with second order is implemented by the first-stage PI current integrator and a second-stage VCO phase integrator. The complementary current-steering digital-to-analog converter is adopted as the feedback path for the current subtraction. Simulation results show that the proposed current-sensing VCO-based CTSDM can achieve a signal-to-noise-and-distortion ratio (SNDR) of 81.36 dB in 10 kHz bandwidth while consuming only 13.2 muw under 1.2 V supply. This corresponds to a Figure-of-Merit (FoM) of 170.15 dB which is suitable for sensor readout applications in internet of thing (IoT).",
author = "Hsieh, \{Yi Ting\} and Chang, \{Shih Shuo\} and Lee, \{Hao Yun\} and Chen, \{Ju Yi\} and Lee, \{Shuenn Yuh\}",
note = "Publisher Copyright: {\textcopyright} 2022 IEEE.; 2022 IEEE International Symposium on Circuits and Systems, ISCAS 2022 ; Conference date: 27-05-2022 Through 01-06-2022",
year = "2022",
doi = "10.1109/ISCAS48785.2022.9937661",
language = "English",
series = "Proceedings - IEEE International Symposium on Circuits and Systems",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "2576--2579",
booktitle = "IEEE International Symposium on Circuits and Systems, ISCAS 2022",
address = "United States",
}