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These applications involve nonlinear effects, e.g., cavitation, which requires driving the ultrasonic transducer with high instantaneous power. Suitable commercial power amplifiers are generally expensive and of large physical size. To address the high barrier of entry, we present an inexpensive and compact amplifier design capable of delivering 4.4 kW peak-power (peak-to-peak voltage: 1.3\u00a0kV into a 50 \u2126 load), with logic-level control of the output amplitude, frequency, and phase. We tested the amplifier in a high-intensity focused ultrasound application, featuring a focusing piezoelectric transducer operating at 4\u00a0MHz in water immersion. The amplifier is based on parallel MOSFETs in a single-ended topology that switches current through the primary side of a transformer. An efficiency of 74% was achieved with 100\u00a0W average power and 4.4 kW peak power into a 50 \u2126 load.<\/jats:p>","DOI":"10.1063\/5.0277982","type":"journal-article","created":{"date-parts":[[2025,12,9]],"date-time":"2025-12-09T13:33:52Z","timestamp":1765287232000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":2,"title":["High-power burst and chirp amplifier for MHz ultrasonics"],"prefix":"10.1063","volume":"96","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7098-6299","authenticated-orcid":false,"given":"Jere","family":"Hyv\u00f6nen","sequence":"first","affiliation":[{"name":"Electronics Research Laboratory, Department of Physics, University of Helsinki , Helsinki 00560,","place":["Finland"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2555-9180","authenticated-orcid":false,"given":"Axi","family":"Holmstr\u00f6m","sequence":"additional","affiliation":[{"name":"Electronics Research Laboratory, Department of Physics, University of Helsinki , Helsinki 00560,","place":["Finland"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7549-4872","authenticated-orcid":false,"given":"Topi","family":"Pudas","sequence":"additional","affiliation":[{"name":"Electronics Research Laboratory, Department of Physics, University of Helsinki , Helsinki 00560,","place":["Finland"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9767-9093","authenticated-orcid":false,"given":"Tom","family":"Sillanp\u00e4\u00e4","sequence":"additional","affiliation":[{"name":"Electronics Research Laboratory, Department of Physics, University of Helsinki , Helsinki 00560,","place":["Finland"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5919-5808","authenticated-orcid":false,"given":"Martin","family":"Weber","sequence":"additional","affiliation":[{"name":"Electronics Research Laboratory, Department of Physics, University of Helsinki , Helsinki 00560,","place":["Finland"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0370-0139","authenticated-orcid":false,"given":"Edward","family":"H\u00e6ggstr\u00f6m","sequence":"additional","affiliation":[{"name":"Electronics Research Laboratory, Department of Physics, University of Helsinki , Helsinki 00560,","place":["Finland"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8768-1205","authenticated-orcid":false,"given":"Ari","family":"Salmi","sequence":"additional","affiliation":[{"name":"Electronics Research Laboratory, Department of Physics, University of Helsinki , Helsinki 00560,","place":["Finland"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2025,12,9]]},"reference":[{"issue":"4","key":"2025120908334903800_c1","doi-asserted-by":"publisher","first-page":"190","DOI":"10.1016\/0041-624X(65)90169-1","article-title":"Ultrasonic welding","volume":"3","year":"1965","journal-title":"Ultrasonics"},{"key":"2025120908334903800_c2","doi-asserted-by":"publisher","first-page":"519","DOI":"10.1016\/j.ultsonch.2015.05.004","article-title":"Ultrasonic cleaning: An historical perspective","volume":"29","year":"2016","journal-title":"Ultrason. 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