Searched for: contributor%3A%22Pertijs%2C+M.A.P.+%28mentor%29%22
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Bellouki, Imad (author)
This work presents an ASIC designed for portable (wearable) ultrasound (US) imaging systems. The ASIC employs a new type of energy-efficient high-voltage (HV) transmit pulser able to generate pulses up to 30V directly from a low-voltage battery supply to excite an ultrasound transducer. HV operation is a necessity in US imaging transceiver...
master thesis 2023
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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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Liu, Tianyi (author)
Transcranial Doppler ultrasound imaging is a crucial tool for both clinical and research applications. Despite its significance, its utility is constrained by the dynamic range limitations of the receiver system. Traditional methods, relying on high-dynamic-range front-end amplifiers and high-resolution ADCs, are often inefficient. These methods...
master thesis 2023
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Dai, Jie (author)
In ultrasound imaging systems, a charge-sharing successive-approximation-register (SAR) ADC has benefits over a charge-redistribution SAR because the charge-sharing SAR is organically compatible with the subarray beamformer which is deployed to reduce the large channel count. Besides, the noise-shaping (NS) SAR is a promising candidate for...
master thesis 2023
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WEI, LAI (author)
3-D ultrasound imaging using a 2-D array provides much more information about our body than conventional 2-D imaging. However, due to the large number of elements in a 2-D array, channel count reduction is required and the power and area budget for each element is limited. It is quite challenging to design an ultrasound interface circuit with...
master thesis 2023
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Ma, Qiyi (author)
Next-generation ultrasound probes will require in-probe digitization. In previous work, the transducer was used as the loop filter of a sigma-delta modulator to obtain a compact element-matched ADC. However, the performance of the previous design can be improved potentially. The aim of this project is to upgrade the element-matched first-order...
master thesis 2023
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Wang, Qian (author)
This work presents a low-noise amplifier (LNA) for miniature 3D ultrasound probes. Time gain compensation (TGC) is required to provide continuously variable gain and compensate for the attenuated echo signal, resulting in decreased output dynamic range (DR). As TGC is embedded in the LNA, a power-hungry LNA is no longer needed to handle the full...
master thesis 2022
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MOU, Jixuan (author)
A photoplethysmogram (PPG) is an important optically-obtained bio-signal that enables convenient daily monitoring of heart rate and oxygen saturation (SpO2). Most state-of-the-art PPG sensing systems require an off-chip photodiode, and the photodiode's output parasitic capacitance limits the power-noise trade offs. The objective of this project...
master thesis 2022
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Ding, Xin (author)
This thesis discusses the architecture, circuit implementation and the simulation results of a cable driver for ultrasound imaging. This design is capable of providing higher bandwidth, better dynamic range, wider output swing, and ideal biasing voltage at the output terminal. <br/>The driver design starts from the analysis and simulation of the...
master thesis 2022
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Zhang, Yixin (author)
In this design, we propose a new method to process the large static signal in the received signal of Doppler ultrasound brain imaging. Through a reproduction-compensation method, a medium resolution ADC and a DAC are used to replace the high-resolution ADC used in the past for the dynamic Doppler signal observation.
master thesis 2021
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Xing, Jianing (author)
This thesis discusses the architecture, circuit implementation and simulation results of an amplitude-tunable bipolar high voltage (HV) pulser for ultrasound imaging. This design is capable of providing a relatively high-resolution amplitude modulation and allows bipolar pulsing under a unipolar supply with a small die size.<br/>The pulser...
master thesis 2021
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Shuverov, Vassiliy (author)
In transit-time ultrasonic flow measurement systems, the system's ability to operate reciprocally in the absence of flow is a highly desirable property. If the reciprocity is lacking in the system, any time delay that appears between the upstream and downstream signals at zero-flow conditions will result in false flow measurement. This...
master thesis 2021
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Vijayakumar, Arvind (author)
Capacitive micromachined ultrasonic transducer (CMUT) technology has been considered as a promising alternative for the conventional piezo electric-based technology in ultrasound imaging systems. Its potential advantages include better image quality, higher operational frequency, and ease of fabrication and<br/>integration with CMOS read-out...
master thesis 2020
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Tams, Jelle (author)
This work presents a type of low noise amplifiers (LNA) that are used for ultrasound imaging systems. To account for the attenuating nature of ultrasound echo signals, a so-called time gain compensation (TGC) circuit is required. By increasing the gain over time, the output dynamic range is decreased, while the switching artifacts are suppressed...
master thesis 2020
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Xiao, Dayang (author)
Miniature ultrasound probes increasingly employ ASIC that drive the transducer elements with HV pulses and process the received echo signals. Due to size constraints, the HV pulsers tend to be relatively simple circuits, in which HV MOS transistors pull the transducer element to a HV supply and back to ground. An important disadvantage of...
master thesis 2020
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Mirzaei, Farzad (author)
This work introduces an architecture that is capable of reducing the number of cables coming out of an ultrasound receiver ASIC by a substantial factor without dropping the frame-rate. It employs a newly developed technique named compressive sensing to exploit the ultrasound signal redundancies in the spatial domain.<br/>There are 32 receive...
master thesis 2018
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Fan, Hao (author)
This work focuses on the improvement of a capacitance-to-digital converter (CDC) based on iterative discharging. Time-domain interpolation is applied on the CDC. With such technology, a high-resolution CDC can be achieved while its fully digital feature can be kept. The proposed CDC achieves a resolution of 2.8fF and a FoM of 1.32pJ/step at 5...
master thesis 2017
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van Willigen, Douwe (author)
This work presents an ASIC designed to be integrated on the tip of an intra-vascular ultrasound catheter, capable of interfacing 64 ultrasonic transducer elements to an imaging system using only one micro-coaxial cable.<br/>A prototype chip has been taped out that can be used to transmit acoustic waves using a small-area transmit switch. The...
master thesis 2017
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Xu, W. (author)
master thesis 2017
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Wu, W. (author)
master thesis 2016
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