Artifact-Free Neurostimulator with Arbitrary Waveform Generation for High-Channel, High-Density Bidirectional Neural Interfaces

To achieve greater specificity in neurostimulation, bidirectional neural interfaces are required to verify the recorded neural response after stimulation. The specific neural interface targeted in this thesis is the epiretinal implant. Due to the heterogeneity of the retinal ganglion cells (RGCs), high-fidelity vision is only possible when all...

Cryogenic Digital-Analog Converter for Two-Qubit Gates in Spin Qubits

<br/>As the number of qubits increases, controlling qubits at cryogenic temperatures with electronics at room temperature becomes infeasible due to the vast number of cabling. This necessitates controlling quantum operations on the qubits with a cryogenic interface, which is low power, scalable and maintains qubit fidelity.<br/><br/>In pursuit...

A High Speed DAC Architecture for Continuous Time Pipeline ADC

This thesis provides an investigation of the architecture and the design of the coarse DACs in continuous time pipeline (CTP) ADC to achieve high SFDR performance within a large bandwidth at sampling frequency of 4.8 GHz in TSMC 28nm technology.<br style="box-sizing: border-box"/> Mismatch errors of the coarse DACs in CTP ADC are very...

Design of a DAC-based Cryo-CMOS 51.2 Gb/s PAM4 Wireline Transmitter

With the current advancements in quantum computing moving more circuitry into the cryogenic chamber there is a need for high-speed connectivity between the cryogenic and room temperature environment. Studies conducted to date have achieved high-speed links of multiple Gb/s utilizing a single CMOS chip at room temperature, yet a Cryo-CMOS...

Cryogenic DAC for the Biasing of Spin Qubits

Disruptive changes in the fields ofcryptography and quantum chemistry can be achieved through quantum computing,as specific computations can be sped up significantly. Thousands to millions ofqubits are required to perform these computations, illustrating the need forlarge quantum computers. These qubits must be cooled to...

Technical, policy and stakeholder analysis of direct air capture

Direct air capture (DAC) can remove CO2 directly from the atmosphere and therefore can be used to reduce atmospheric concentrations of CO2. Despite this, there is little research which carries out a detailed comparison of these systems. This is also true for research which analyses the effect policies regarding climate change are having on DAC...

Electrochemical synthesis of CO2-methanol utilizing direct air capture, CO2 electrolysis and H2O electrolysis: A life cycle assessment

This thesis examines the production of an alternative liquid hydrocarbon fuel, namely CO2-methanol, produced utilising DAC, CO2 electrolysis, H2O electrolysis and thermo-catalytic synthesis. The reason for such research lies in a persistent growth in global energy demand, a significant share of which comes from liquid fuels, in the present...

Direct Air Capture: Desorption of CO2 and H2O from amines

Zero Emission Fuels(ZEF) is a start up, and ZEF is building a micro plant which is ableto produce bio-methanol from solar energy and air. CO2and H2O are absorbed from theair, the H2O is split into H2which is fed together with the CO2in the methanol synthesisreactor. The reaction product is distilled and Grade AA MeOH is the product. Thisresearch...

A Low Distortion Sine-Wave Generator based on a Resistive DACs

This thesis proposes a novel low distortion, on-chip sine-wave generator. A low distortion input is required in many test and measurement setups for analog and mixed-signal systems, where the input signal should have less distortion than that contributed by the device under test (DUT). For conventional oscillators, there is a compromise between...

A compact 12-bit DAC and output buffer in 40nm for built-in self-test

Combined Capacitance and Temperature to Digital Converter

This thesis describes the design and measurement of an IC which can digitize both capacitance and temperature. Capacitance sensing functionality is added to an existing Temperature to Digital Converter (TDC) without adding significant die area. Two kinds of baseline capacitance compensation techniques have been investigated and their performance...

Measurement of partial discharges and dielectric losses on rotating machines using damped AC voltages

Large rotating machines in all kinds of applications ages due to operating stresses. Since many years the condition of stator insulation in these motors and generators is investigated using measurement of partial discharge (PD) and dielectric loss factor (tan delta). In particular, off-line and on-line methods of applying PD detection have...