A Programmable Energy Recycling Resonant Pulser for Miniature Wearable Ultrasound Applications: Towards portable ultrasound diagnostics

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...

A transceiver ASIC for a single-cable 64-element intra-vascular ultrasound probe

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...

Energy Efficient and Compact RF High-Power Amplifiers

The main objectives of this thesis are to improve the energy efficiency and physical form-factor of high-power amplifiers in base station applications. As such, the focus of this dissertation is placed on the outphasing amplifier concept, which can offer high-efficiency, good linearity and excellent opportunities for system integration. With...