{"id":205,"date":"2015-05-13T10:16:32","date_gmt":"2015-05-13T18:16:32","guid":{"rendered":"http:\/\/www.ece.ucdavis.edu\/hsics\/?page_id=205"},"modified":"2015-05-13T10:16:32","modified_gmt":"2015-05-13T18:16:32","slug":"cmos-mm-wave-plasma-imaging","status":"publish","type":"page","link":"https:\/\/www.ece.ucdavis.edu\/hsics\/cmos-mm-wave-plasma-imaging\/","title":{"rendered":"CMOS mm-Wave Plasma Imaging"},"content":{"rendered":"

Background<\/strong><\/p>\n

Fusion plasmas promise clean energy. For its eventual realization, it is essential to visualize turbulent structures accurately and timely.\u00a0 Microwave reflectometry<\/span> is a radar technique used to infer the electron density characteristics by probing the density-dependent cutoff layer in plasmas.\u00a0Microwave Imaging Reflectometry<\/span> (MIR), which was conceived by Dr. Mazzucato<\/span> of the Princeton Plasma Physics Laboratory, is a technique in which large-aperture optics at the plasma edge are used to collect as much of the scattered wavefront<\/span> as possible and optically focus an image of the cutoff layer onto an array of detectors, thus restoring the integrity of the phase measurement. For more details regarding MIR, please visit Prof. Neville Luhmann’s<\/a> and Prof. Ernesto Mazzucato’s <\/a>lab websites.<\/p>\n

Our Approach<\/strong><\/p>\n

We are leveraging CMOS based\u00a0IC approaches to develop\u00a0miniaturized MIR systems. As the first step, we are developing the MIR CMOS transmitter, as shown in the Figure below.\u00a0To allow simultaneous detection of multiple fluctuations, simultaneous multiple frequency tones are launched with each frequency reflecting from a different density-dependent cutoff layer. A wide frequency range of 55 GHz to 75 GHz is required. The challenge of multiple frequency generation from one transmitter is the large peak to noise ratio (PAR) limiting the output power of each tone to Pout\/N^2 for linear operation. To overcome this issue, the\u00a0transmitter allocates 2 frequency tones per channel and generates 8 tones simultaneously with 4 parallel channels. This offers the advantages of reducing system complexity by removing quadrature LO generation, high efficiency power combining by using diplexer based combiner structure.<\/p>\n

\"MIR\"<\/a><\/p>\n

Publication<\/strong><\/p>\n

    \n
  1. Y. Wang, B. Tobias, Y.-T. Chang, J.-H. Yu, M. Li, F. Hu, M. Chen, M. Mamidanna, T. Phan, A.-V. Pham, J. Gu, X. Liu, Y. Zhu, C.W. Domier, L. Shi, E. Valeo, G.J. Kramer, D. Kuwahara, Y. Nagayama, A. Mase, and N.C. Luhmann Jr, \u201cMillimeter-wave imaging of magnetic fusion plasmas: technology innovations advancing physics understanding,\u201d vol. 57, Nuclear Fusion, March 2017<\/li>\n
  2. Y.-T. Chang, Y. Ye, H. Xu, Q. J. Gu, C. Domier, and N. C, Luhmann, Jr., \u201cA Ultra-Wideband CMOS PA with Dummy Filling for Reliability,\u201d Elsevier Solid State Electronics, pp.125-133, March 2017<\/li>\n
  3. Y.-T. Chang, Y. Ye, Q. J. Gu, C. Domier, and N.C. Luhamnn, Jr \u201cThe V-Band CMOS Multi-Frequency Transmitter for Plasma Imaging Radar Reflectometric Diagnostic,\u201d IEEE International Microwave Symposium 2016<\/li>\n
  4. Y.-T. Chang, Y. Ye, C. Domier, and Q. J. Gu, \u201cA Ultra-Wideband CMOS PA with Dummy Filling for Reliability,\u201d 2015 IEEE International Wireless Symposium<\/em><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Background<\/strong><\/p>\n

    Fusion plasmas promise clean energy. For its eventual realization, it is essential to visualize turbulent structures accurately and timely.\u00a0 Microwave reflectometry is a radar technique used to infer the electron density characteristics by probing the density-dependent cutoff layer in plasmas.\u00a0Microwave Imaging Reflectometry (MIR), which was conceived by Dr. Mazzucato \u2026 Continue reading → <\/span><\/a><\/p>\n","protected":false},"author":13,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-205","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ece.ucdavis.edu\/hsics\/wp-json\/wp\/v2\/pages\/205","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ece.ucdavis.edu\/hsics\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ece.ucdavis.edu\/hsics\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ece.ucdavis.edu\/hsics\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ece.ucdavis.edu\/hsics\/wp-json\/wp\/v2\/comments?post=205"}],"version-history":[{"count":0,"href":"https:\/\/www.ece.ucdavis.edu\/hsics\/wp-json\/wp\/v2\/pages\/205\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ece.ucdavis.edu\/hsics\/wp-json\/wp\/v2\/media?parent=205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}