A Compact GaNFET-Based Power Amplifier for ASIC-Based Miniature NMR Spectrometers

Autor:	David Ariando, Yi-Qiao Song, Soumyajit Mandal, Shin Utsuzawa, Yiqiao Tang
Rok vydání:	2021
Předmět:	Materials science Spectrometer business.industry Amplifier Topology (electrical circuits) Integrated circuit law.invention CMOS Application-specific integrated circuit law Electromagnetic coil Optoelectronics Radio frequency business
Zdroj:	ISCAS
DOI:	10.1109/iscas51556.2021.9401435
Popis:	This paper describes a highly-efficient and compact GaNFET-based power amplifier for use in miniaturized low-field nuclear magnetic resonance (NMR) spectrometers and magnetic resonance imaging (MRI) scanners based on CMOS application-specific integrated circuit (ASICs). The amplifier utilizes a H-bridge topology with bootstrap driver and can work at frequencies up to several MHz. It also includes a GaNFET-based Q-switch to damp the coil after each RF pulse. Tests with a tuned probe at 2 MHz show > 90% efficiency while delivering ~350 W of power to the coil, and a ring-down time of ~4 μs.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b89046eef22e68fcf91daa20fe438b42 https://doi.org/10.1109/iscas51556.2021.9401435 Zobrazit plný text záznamu