document

GΩ Resistor for AC-coupled Amplifier in Audio Application

WANG, Junjie (author)

AC-coupled amplifiers (ACCA) offer lower noise than traditional resistor feedback amplifiers, which benefits signal-to-noise ratio (SNR) for audio applications. Due to the DC isolation of the capacitor, a feedback resistor is needed to set the virtual ground of ACCA’s amplifier. However, an external feedback resistor raises system noise and...

master thesis 2023

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Embroidering for cycling: Studying the impact of vulvar cancer on cycling mobility and developing embroidered resistive pressure sensors to investigate saddle pressure while cycling

van Beurden, Frank (author)

master thesis 2023

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Prototype Design and Workflow for a Scoliosis Brace Monitoring and Evaluation System

van Borren, Simon (author)

While bracing has been proven to be an effective treatment strategy for adolescent idiopathic scoliosis, its effectiveness is often found to be inconsistent in practice. One of the main reasons for this is that the forces applied by the brace may be subject to constant change, while its required effect is expected to change over time as well....

master thesis 2022

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Characterization, Modeling, and Test of Intermediate State Defects in STT-MRAMs

Wu, L. (author), Rao, Siddharth (author), Taouil, M. (author), Marinissen, Erik Jan (author), Kar, Gouri Sankar (author), Hamdioui, S. (author)

The manufacturing process of STT-MRAM requires unique steps to fabricate and integrate magnetic tunnel junction (MTJ) devices which are data-storing elements. Thus, understanding the defects in MTJs and their faulty behaviors are paramount for developing high-quality test solutions. This article applies the advanced device-aware test to...

journal article 2022

document

A − 91 dB THD + N, Class-D Piezoelectric Speaker Driver Using Dual Voltage/Current Feedback for Resistor-Less LC Resonance Damping

Karmakar, S. (author), Berkhout, Marco (author), Makinwa, K.A.A. (author), Fan, Q. (author)

This article presents a Class-D audio amplifier for capacitive piezoelectric speaker loads. Employing a dual voltage feedback (VFB)/current feedback (CFB) topology, the amplifier is capable of damping LC resonance without using an external damping resistor, therefore reducing system power consumption, cost, and size. Additional power savings are...

journal article 2022

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A 2.5-μW Beyond-the-Rails Current Sensor With a Tunable Voltage Reference and ±0.6% Gain Error From −40 ◦C to +85 ◦C

Brito Zamparette, R.L. (author), Makinwa, K.A.A. (author)

This letter presents a low-power, fully integrated current sensor for Coulomb-counting. It employs a hybrid delta–sigma modulator ( ΔΣM ) with an FIR-DAC to digitize the voltage drop across a shunt. The modulator’s first stage consists of a capacitively coupled chopper amplifier, which enables a beyond-the-rails (−0.3 to 5 V) input common...

journal article 2022

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A 16 MHz CMOS RC Frequency Reference With ±90 ppm Inaccuracy From -45 °C to 85 °C

Gürleyük, C. (author), Pan, S. (author), Makinwa, K.A.A. (author)

This article presents a 16-MHz RC frequency reference implemented in a standard 180-nm CMOS process. It consists of a frequency-locked loop (FLL) in which the output frequency of a digitally controlled oscillator (DCO) is locked to the frequency-phase characteristic of a Wien bridge RC filter. Since it is made from on-chip resistors and...

journal article 2022

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Resistor-based Temperature Sensors in CMOS Technology

Pan, S. (author)

This thesis describes the design and implementation of integrated temperature sensors based on the temperature dependency of CMOS resistors.

doctoral thesis 2021

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A Self-Calibrated Hybrid Thermal-Diffusivity/Resistor-Based Temperature Sensor

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

This article describes a hybrid temperature sensor in which an accurate, but energy-inefficient, thermal diffusivity (TD) sensor is used to calibrate an inaccurate, but efficient, resistor-based sensor. The latter is based on silicided polysilicon resistors embedded in a Wien-bridge (WB) filter, while the former is based on an electrothermal...

journal article 2021

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Printed Polysilicon on Stretchable Substrate for Strain Sensor Applications

Boyapati, Yamini (author)

Over the past few years, post-surgery monitoring has become an important aspect of the patient’s healthcare in the modern clinical medicine. This kind of monitoring is done to examine various physical and chemical parameters, while considering any post-surgery complications. Therefore, the patient’s care is continued even after the surgical...

master thesis 2020

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Active material utilization and capacity of fiber-based battery electrodes

Zhuo, M. (author), Grazioli, D. (author), Simone, A. (author)

This study presents a three-dimensional computational model to evaluate effective conductivity and capacity of fiber-based battery electrodes. We employ electrodes composed of conductive and active material nanofibers dispersed in an electrolyte matrix. The effective conductivity is calculated by means of an equivalent resistor network model,...

journal article 2020

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Instrumented Skeleton Sled: Focussing on force and orientation sensing

de Jong, Jan (author), Heller, Martijn (author)

This report details the design of an instrumentation system to be used on a skeleton sled. The system will measure data during the run on a skeleton track using several sensors and process and visualise the data afterwards in order to shorten the learning curve of the athlete and give quantitative feedback. The subsystem discussed in this report...

bachelor thesis 2019

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A Compact Resistor-Based Temperature Sensor

Preda, Valeria (author)

Smart temperature sensors can be used for the temperature compensation of micro-electromechanical (MEMS) frequency references. From the different types of CMOS temperature sensors, resistor-based sensors are currently the most energy-efficient. However, compared with bipolar transistor (BJT)-based temperature sensors, resistors suffer from...

master thesis 2019

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Resistive Matching using an AC Boost Converter for Efficient Ultrasonic Wireless Power Transfer

Bisschop, Marc (author)

Implantable Medical Devices (IMDs) could fulfill many different functions in the human body. Batteries have always been the main power source of these devices. Batteries have some drawbacks, the biggest one being the replacement of IMDs with fully discharged batteries. In this thesis a wireless power transfer system, with a receiving power...

master thesis 2019

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A 5800-μm² Resistor-Based Temperature Sensor with a One-Point Trimmed Inaccuracy of ±1.2 °c (3σ) from -50 °c to 105 °c in 65-nm CMOS

Lee, Yongtae (author), Choi, Woojun (author), Kim, Taewoong (author), Song, Seungwoo (author), Makinwa, K.A.A. (author), Chae, Youngcheol (author)

This letter describes a compact resistor-based temperature sensor intended for the thermal monitoring of microprocessors and DRAMs. It consists of an RC poly phase filter (PPF) that is read out by a frequency-locked loop (FLL) based on a dual zero-crossing (ZC) detection scheme. The sensor,fabricated in 65-nm CMOS,occupies 5800 μm²...

conference paper 2019

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A 5800-μ m ₂Resistor-Based Temperature Sensor with a One-Point Trimmed Inaccuracy of ±1.2 °c (3σ) From-50 °c to 105 °c in 65-nm CMOS

Lee, Yongtae (author), Choi, Woojun (author), Kim, Taewoong (author), Song, Seungwoo (author), Makinwa, K.A.A. (author), Chae, Youngcheol (author)

This letter describes a compact resistor-based temperature sensor intended for the thermal monitoring of microprocessors and DRAMs. It consists of an RC poly phase filter (PPF) that is read out by a frequency-locked loop (FLL) based on a dual zero-crossing (ZC) detection scheme. The sensor, fabricated in 65-nm CMOS, occupies 5800 μ m2 and...

journal article 2019

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A 0.12mm² Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C

Pan, S. (author), Gürleyük, C. (author), Pimenta, Matheus F. (author), Makinwa, K.A.A. (author)

Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm ² ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm ² resistor-based sensor that uses a...

conference paper 2019

document

Improving reliability of Force Sensing Resistors for a Pressure Ulcer Prevention System

Langereis, Jordy (author), Veldhuijzen, Duco (author)

Pressure ulcers develop when skin is subjected to a mechanical load over time, resulting in tissue damage. Within a wide range of patients, pressure ulcers occur, often accompanied by severe pain.<br/>This is resulting in a prolonged hospital stay. The company Momo Medical is developing a sensor plate<br/>with the goal of preventing pressure...

bachelor thesis 2018

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A Compact Resistor-Based CMOS Temperature Sensor With an Inaccuracy of 0.12 °C (3σ) and a Resolution FoM of 0.43 pJ·K² in 65-nm CMOS

Choi, Woojun (author), Lee, Yongtae (author), Kim, Seonhong (author), Lee, Sanghoon (author), Jang, Jieun (author), Chun, Junhyun (author), Makinwa, K.A.A. (author), Chae, Youngcheol (author)

This paper presents a compact resistor-based CMOS temperature sensor intended for dense thermal monitoring. It is based on an RC poly-phase filter (PPF), whose temperature-dependent phase shift is read out by a frequency-locked loop (FLL). The PPF's phase shift is determined by a zero-crossing (ZC) detector, allowing the rest of the FLL to be...

journal article 2018

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A 0.25mm² Resistor-Based Temperature Sensor with an Inaccuracy of 0.12°C (3σ) from -55°C to 125°C and a Resolution FOM of 32fJK²

Pan, S. (author), Makinwa, K.A.A. (author)

Temperature sensors based on Wheatstone bridges, e.g. [1,2], have recently achieved higher resolution and greater energy efficiency than conventional BJT-based sensors [3]. However, this comes at the expense of area, making them less attractive in industrial applications. This paper presents a Wheatstone-bridge sensor that uses a zoom-ADC...

conference paper 2018