Gallium Nitride Based High-Power Switched HIFU Pulser with Real-Time Current/Voltage Monitoring

Carpenter, Thomas M.; Cowell, David M. J.; Clegg, Harry R.; McLaughlan, James R.; Freear, Steven

doi:10.1109/ultsym.2019.8925869

Cited by 1 publication

(3 citation statements)

References 14 publications

(13 reference statements)

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“…In each of the measurements the spectrum is significantly cleaner than that of the original work presented work [40] due to the improved analogue front end design, higher sampling rate, and improved anti-aliasing filtering. The peaks in the frequency domain are also significantly sharper than in the previous design.…”

Section: Resultsmentioning

confidence: 80%

“…A prototype of the proposed power measurement circuit was previously presented in the form of a conference article [40], which provided a proof of concept method of integrated power measurement circuitry into a HIFU transmitter by performing floating high-side current measurements using an 8 bit 11 MS s −1 ADC and parallel-to-serial data converter to allow transmission through a low channel count digital isolator. In this work, the design of the prototype has been improved and adapted to allow for an increase in bit depth and higher sampling rate.…”

Section: A Integrated Power Measurement Circuitmentioning

confidence: 99%

“…In the previous design [40], separate measurement circuits were used for voltage and current measurement, with the voltage measured with a converter referenced to ground. To increase the performance of the measurement circuit without increasing the size of the transmitter, the measurement topology was redesigned to float both the current and voltage measurement on the output, and instead measure the voltage of ground relative to the output, as shown in Figure 5a.…”

Section: A Integrated Power Measurement Circuitmentioning

confidence: 99%

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High-Power Gallium Nitride HIFU Transmitter With Integrated Real-Time Current and Voltage Measurement

Carpenter

Cowell

Clegg

et al. 2021

IEEE Trans. Biomed. Circuits Syst.

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High-Intensity Focused Ultrasound (HIFU) therapy provides a non-invasive technique with which to destroy cancerous tissue without using ionizing radiation. To drive large singleelement HIFU transducers, ultrasound transmitters capable of delivering high powers at relevant frequencies are required. The acoustic power delivered to a transducers focal region will determine the treated area, and due to safety concerns and intervening layers of attenuation, control of this output power is critical.A typical setup involves large inefficient linear power amplifiers to drive the transducer. Switched mode transmitters allow for a more compact drive system with higher efficiencies, with multi-level transmitters allowing control over the output power. Real-time monitoring of power delivered can avoid damage to the transducer and injury to patients due to over treatment, and allow for precise control over the output power.This study demonstrates a transformer-less, high power, switched mode transmit transmitter based on Gallium-Nitride (GaN) transistors that is capable of delivering peak powers up to 1.8 kW at up to 600 Vpp, while operating at frequencies from DC to 5 MHz. The design includes a 12 bit 16 MHz floating Current/Voltage (I-V) measurement circuit to allow real-time high-side monitoring of the power delivered to the transducer allowing use with multi-element transducers.

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Section: Resultsmentioning

confidence: 80%

Section: A Integrated Power Measurement Circuitmentioning

confidence: 99%

Section: A Integrated Power Measurement Circuitmentioning

confidence: 99%

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