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A 120-MHz BW, 122-dBFS SFDR CT ΔΣ ADC With a Multi-Path Multi-Frequency Chopping Scheme

Javvaji, L.S. (author), Bolatkale, M. (author), Bajoria, Shagun (author), Rutten, Robert (author), Essink, Bert Oude (author), Beijens, Koen (author), Makinwa, K.A.A. (author), Breems, L.J. (author)

Advances in CMOS technologies and circuit techniques have led to the development of continuous-time delta-sigma modulators (CTΔ Σ Ms) that sample at gigahertz (GHz) frequencies and achieve high linearity [-100 dBc and >120 dBFS spurious-free dynamic ranges (SFDRs)] in wide bandwidths (>100 MHz). However, at low frequencies (≤ 10 MHz),...

journal article 2024

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A VCO-based ADC for MEMS microphones

Guo, Junwei (author)

MEMS microphones offer a significant scope to improve miniaturization, integration and cost of acoustic systems, poised to be the preferred microphone option for consumer electronics and medical advancements. A MEMS microphone needs a readout interface to convert the microphone’s output to a digital code for further processing, while its poor...

master thesis 2023

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A Flow-to-Digital Converter based on a Thermal-Sigma Delta Modulator

Gupta, Avish (author)

Flow sensing is essential in various industrial, commercial, and biomedical applications. Although many types of flow sensors exist, thermal flow sensors are widely used due to their simple sensing elements (heaters and temperature sensors) and low fabrication costs. A low-cost interface for thermal flow sensors can then be realized with a...

master thesis 2023

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Spread-Spectrum Modulated Multi-Channel Biosignal Acquisition Using a Shared Analog CMOS Front-End

Rout, Samprajani (author), Monna, G.L.E. (author), Pareschi, Fabio (author), Setti, Gianluca (author), Serdijn, W.A. (author)

The key challenges in designing a multi-channel biosignal acquisition system for an ambulatory or invasive medical application with a high channel count are reducing the power consumption, area consumption and the outgoing wire count. This article proposes a spread-spectrum modulated biosignal acquisition system using a shared amplifier and...

journal article 2023

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Design of a Cryo-CMOS Smart Temperature Sensor

Cerviño Fungueiriño, David Cervino (author)

Quantum computers exploit the quantum behavior of quantum bits (qubits) that are typically operated at cryogenic temperature. Qubits require an electronic control interface. Nowadays, such classical electronic controllers use bulky instruments operated far fromthe qubits outside the cryostat. To run practical quantum algorithms, thousands to...

master thesis 2022

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A High Input Impedance Readout Integrated Circuit based on Continuous-Time Sigma-Delta Modulator with FIR DAC Feedback

YU, Jinqian (author)

This thesis focuses on the design of a high input impedance sensor readout system based on a continuous-time sigma-delta modulator with finite-impulse-response digital-to-analog converter feedback.<br/><br/>Both the system-level and circuit-level design techniques of this system are investigated. The concept and design methods of finite-impulse...

master thesis 2022

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A Low-speed, Low-acceleration Controller for Cost-effective Reaction-wheels: Design, Simulation & Implementation

Lopes, Wilfred (author)

With the requirements for CubeSats increasing, a push towards utilizing high­performance equipment has never been greater. Incorporating these equipment in an environment that is cost­, space­ and power­constrained, is challenging. Simultaneously, high­performance equipment require high pointing­accuracy and low­jitter. This thesis proposes the...

master thesis 2021

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Oscillator based Analog-to-Digital Converter for Action Potential Readout in Microelectrode Arrays

Baladari, Nikhita (author)

The functioning of the brain depends on the interplay between a large number of neurons. To understand the information processing in neuronal networks, we need tools to record the electrical activity of cells at high resolution. Microelectrode arrays (MEAs) are predominantly used to measure neuronal activity<br/>at high spatial and temporal...

master thesis 2020

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Compact Thermal Diffusivity Sensors for On-Chip Thermal Management

Sonmez, U. (author)

Today’s systems-on-chip (SOCs) and microprocessors are complex systems that require multiple temperature sensors to monitor temperature variations in multiple spots on a single silicon die. For such thermal management applications, specialized compact and fast temperature sensors are required. This is necessary because executing an intensive...

doctoral thesis 2020

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A CMOS-Imager-Pixel-Based Temperature Sensor for Dark Current Compensation

Xie, S. (author), Abarca Prouza, A.N. (author), Theuwissen, A.J.P.A.M. (author)

This brief proposes employing each of the classical 4 transistor (4T) pinned photodiode (PPD) CMOS image sensor (CIS) pixels, for both imaging and temperature measurement, intended for compensating the CISs' dark current, and dark signal non-uniformity (DSNU). The proposed temperature sensors rely on the thermal behavior of MOSFETs working in...

journal article 2020

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A 6800-μ m² Resistor-Based Temperature Sensor with ±0.35 °c (3σ) Inaccuracy in 180-nm CMOS

Angevare, J. (author), Makinwa, K.A.A. (author)

This paper describes a compact resistor-based temperature sensor that has been realized in a 180-nm CMOS process. It occupies only 6800 μ m², thanks to the use of a highly digital voltage-controlled oscillator (VCO)-based phase-domain sigma-delta modulator, whose loop filter consists of a compact digital counter. Despite its small...

journal article 2019

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A High-speed Amplifier And Loop Filter Architecture For A GHz Sampling Sigma-Delta ADC

Zhan, Xin (author)

This thesis presents the design and implementation of a low power 3rd-order loop filter and a low power, compact, high-speed inverter-based amplifier designed in 28nm HPC for a GHz sampling Σ∆ modulator.<br/>In the earlier design, the size of the pMOS in an inverter was found to be nine times larger than the nMOS which is not practical to obtain a...

master thesis 2018

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A Low-Power CMOS Wind Sensor

van der Kruijt, Arjan (author)

This work describes a low-power and low-cost alternative to mechanical wind sensors, suitable for volume production in standard CMOS processes. The CMOS wind sensor operates in the electro-thermal domain; therefore, it has no moving parts and therefore requires very little maintenance. Moreover, the CMOS wind sensor is an active sensor, compared...

master thesis 2018

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High-Pass ΣΔ Converter Design Using a State-Space Approach and Its Application to Cardiac Signal Acquisition

Rout, S. (author), Serdijn, W.A. (author)

Cardiac signal acquisition with high linearity and accuracy of the high-pass cut-off frequency imposes a challenge on the implementation of the analog preprocessing and the analog-to-digital converter. This paper describes a state-space-based methodology for designing high-pass sigma-delta (HP Sigma \Delta topologies with high linearity,...

journal article 2018

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A Multi-Path Sigma Delta ADC: For use in battery management systems

Loopik, Leon (author)

This thesis presents the design and testing of a multi-path analog-to-digital converter for current sensing in battery management systems. The specifications of this converter are (1) continuously integrate and convert a signal at 125 Hz with a resolution of 20 bit and (2) perform on demand fast conversions of 20 μs at a resolution of 14 bit....

master thesis 2017

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Compact Thermal-Diffusivity-Based Temperature Sensors in 40-nm CMOS for SoC Thermal Monitoring

Sonmez, U. (author), Sebastiano, F. (author), Makinwa, K.A.A. (author)

An array of temperature sensors based on the thermal diffusivity (TD) of bulk silicon has been realized in a standard 40-nm CMOS process. In each TD sensor, a highly digital voltage-controlled oscillator-based Σ Δ ADC digitizes the temperature-dependent phase shift of an electrothermal filter (ETF). A phase calibration scheme is used to...

journal article 2017

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Analysis and Design of VCO-Based Phase-Domain ΣΔ Modulators

Sonmez, U. (author), Sebastiano, F. (author), Makinwa, K.A.A. (author)

VCO-based phase-domain ΣΔ modulators employ the combination of a voltage-controlled-oscillator (VCO) and an up/down counter to replace the analog loop filter used in conventional ΣΔ modulators. Thanks to this highly digital architecture, they can be quite compact, and are expected to shrink even further with CMOS scaling. This paper describes...

journal article 2017

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A Power-Efficient Readout for Wheatstone-Bridge Sensors With COTS Components

Jiang, H. (author), Vogel, J.G. (author), Nihtianova, S. (author)

This paper presents a direct digital converter for Wheatstone bridge sensors, which is realized with commercial off-the-shelf components. The power efficiency of the readout is enhanced by embedding the bridge sensor in a second-order continuous-time sigma-delta modulator (CTDeltaSigmaM). By directly digitizing the output signal of a Wheatstone...

journal article 2017

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aEEG analog front end IC for a neonatal brain development monitoring

Kostałkowski, M.K. (author)

Every year number of prematurely born infants grows. Most underdeveloped organ after birth is brain. Therefore its monitoring is very important, especially as it can provide indications about health state in a future, both short and long term. Non invasive method of brain monitoring is EEG recording. However tedious process of system set up and...

master thesis 2016

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A Highly-Scalable Thermal-Diffusivity-Based Temperature Sensor

Angevare, J.A. (author)

A highly digital temperature sensor, based on the thermal diffusivity of silicon, for thermal management applications has been reported. Recently, Thermal-Diffusivity based temperature sensors have undergone a radical change from an analog-based readout architecture to a more digital VCO-based one. However the more digital approach led to...

master thesis 2015