A 0.6-to-1.2 V Scaling Friendly Discrete-Time OTA-Free ΔΣ-ADC for IoT Applications

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A 0.6-to-1.2 V Scaling Friendly Discrete-Time OTA-Free ΔΣ-ADC for IoT Applications
Title:
A 0.6-to-1.2 V Scaling Friendly Discrete-Time OTA-Free ΔΣ-ADC for IoT Applications
Journal Title:
ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference (ESSCIRC)
Keywords:
Publication Date:
26 October 2021
Citation:
An, K.-C., Narasimman, N., & Kim, T. T.-H. (2021). A 0.6-to-1.2 V Scaling Friendly Discrete-Time OTA-Free ΔΣ-ADC for IoT Applications. ESSCIRC 2021 - IEEE 47th European Solid State Circuits Conference (ESSCIRC). https://doi.org/10.1109/esscirc53450.2021.9567788
Abstract:
This work presents a scaling-friendly Discrete-Time (DT) 2 nd order ΔΣ ADC using a passive switched capacitor (SC) integrator and a novel VCO-Frequency Delta-Sigma Modulator (FDSM). The proposed VCO-FDSM employs a linear VCO with negative feedback. A novel all-digital frequency quantizer quantizes the VCO frequency into a multibit output with inherent dynamic element matching (DEM) property, which provides the 1 st order mismatch noise shaping in the feedback DAC. The passive SC integrator at the input provides an additional order of noise shaping to the VCO-FDSM. This highly digital architecture facilitates a trade-off between the supply voltage and the operational bandwidth (BW) and makes the design suitable for energy-efficient IoT applications. The test chip fabricated in 65nm CMOS technology operates at the supply voltages ranging from 0.6 V to 1.2 V and achieves a 75.7dB peak SNR in 3.5kHz BW, consuming 7.78 µW with a FoMs of 162.2dB at a 1V supply voltage.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the A*STAR - Programmatic - Ultrasonic Wavefront Computing
Grant Reference no. : A19E8b0102
Description:
© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
ISBN:
978-1-6654-3751-6
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