Ring-Oscillator with Multiple Transconductors for Linear Analog-to-Digital Conversion

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ID: 271045
2021
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Abstract
This paper proposes a new circuit-based approach to mitigate nonlinearity in open-loop ring-oscillator-based analog-to-digital converters (ADCs). The approach consists of driving a current-controlled oscillator (CCO) with several transconductors connected in parallel with different bias conditions. The current injected into the oscillator can then be properly sized to linearize the oscillator, performing the inverse current-to-frequency function. To evaluate the approach, a circuit example has been designed in a 65-nm CMOS process, leading to a more than 3-ENOB enhancement in simulation for a high-swing differential input voltage signal of 800-mVpp, with considerable less complex design and lower power and expected area in comparison to state-of-the-art circuit based solutions. The architecture has also been checked against PVT and mismatch variations, proving to be highly robust, requiring only very simple calibration techniques. The solution is especially suitable for high-bandwidth (tens of MHz) medium-resolution applications (10–12 ENOBs), such as 5G or Internet-of-Things (IoT) devices.
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alvero-gonzalez2021electronicsring-oscillator Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Leidy Mabel Alvero-Gonzalez;Victor Medina;Vahur Kampus;Susana Paton;Luis Hernandez;Eric Gutierrez;Alvero-Gonzalez, Leidy Mabel;Medina, Victor;Kampus, Vahur;Paton, Susana;Hernandez, Luis;Gutierrez, Eric;
Journal Electronics
Year 2021
DOI
10.3390/electronics10121408
URL
https://www.mdpi.com/2079-9292/10/12/1408
Keywords
5g iot data conversion frequency modulation voltage-controlled oscillator linearization techniques

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