GΩ Resistor for AC-coupled Amplifier in Audio Application

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...

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

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

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....

Printed Polysilicon on Stretchable Substrate for Strain Sensor Applications

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...

Instrumented Skeleton Sled: Focussing on force and orientation sensing

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...

A Compact Resistor-Based Temperature Sensor

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...

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

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...

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

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...

Effects of Silicon Oxides as Substrates for Graphene Gas Sensor

This thesis study investigates the effects of differently prepared oxide substrates on gas sensing behaviors of graphene gas sensor. Explanations for why such effects happen are also revealed through experimental works. The thesis consists of a detailed study of gas sensing behaviors from graphene gas sensors using different oxide substrates....

An Energy-Efficient, Resistor-Based, Smart Temperature Sensor

Energy-Efficient Capacitive-Sensor Interface Based on A Multi-Slope ADC

This thesis presents an energy-efficient capacitive sensor interface based on a multi-slope analog-to-digital converter (ADC). This highly stable capacitance-to-digital converter (CDC) utilizes precision resistor as reference components. By utilizing a multi-slope analog-to-digital converter, the conversion time of this design is reduced down to...