TY - GEN
T1 - 0.43nJ, 0.48pJ/step second-order ∆Σ current-to-digital converter for IoT applications
AU - Danesh, Mohammadhadi
AU - Jayaraj, Akshay
AU - Chandrasekaran, Sanjeev Tannirkulam
AU - Sanyal, Arindam
N1 - Funding Information:
This work is supported by Semiconductor Research Corporation (SRC) task # 2712.020 through The University of Texas at Dallas' Texas Analog Center of Excellence (TxACE).
Funding Information:
V. ACKNOWLEDGMENT This work is supported by Semiconductor Research Corporation (SRC) task # 2712.020 through The University of Texas at Dallas’ Texas Analog Center of Excellence (TxACE). REFERENCES
Publisher Copyright:
© 2019 IEEE
PY - 2019
Y1 - 2019
N2 - A second-order ∆Σ current-to-digital converter (CDC) for IoT sensing applications is presented in this paper. The proposed CDC uses pseudo-differential current-starved ring oscillators as phase domain integrators. A negative feedback loop relaxes input ring oscillator nonlinearity. The proposed architecture does not require excess loop delay compensation or nonlinearity calibration. Digital differentiation using XOR implements an intrinsic first-order high-pass shaping of static element mismatch in the current steering digital-to-analog converter. A prototype CDC in 65nm CMOS process achieves 62dB dynamic range at 0.48pJ/conversion-step and has 20X better energy-efficiency than state-of-the-art.
AB - A second-order ∆Σ current-to-digital converter (CDC) for IoT sensing applications is presented in this paper. The proposed CDC uses pseudo-differential current-starved ring oscillators as phase domain integrators. A negative feedback loop relaxes input ring oscillator nonlinearity. The proposed architecture does not require excess loop delay compensation or nonlinearity calibration. Digital differentiation using XOR implements an intrinsic first-order high-pass shaping of static element mismatch in the current steering digital-to-analog converter. A prototype CDC in 65nm CMOS process achieves 62dB dynamic range at 0.48pJ/conversion-step and has 20X better energy-efficiency than state-of-the-art.
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U2 - 10.1109/ISCAS.2019.8702802
DO - 10.1109/ISCAS.2019.8702802
M3 - Conference contribution
AN - SCOPUS:85066796100
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
BT - 2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019
Y2 - 26 May 2019 through 29 May 2019
ER -