The development of a pulse RF high power amplifier for a portable NMR spectrometer : a thesis presented in partial fulfillment of the requirement for the degree of Master of Engineering at Massey University

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dc.contributor.authorJiang, Tianyang Ted
dc.date.accessioned2008-12-03T02:35:06Z
dc.date.availableNO_RESTRICTIONen_US
dc.date.available2008-12-03T02:35:06Z
dc.date.issued2008
dc.description.abstractThe RF high power amplifier is a key module in the NMR spectrometer. Robustness, lower power consumption, and small size are requirements. In this thesis, devices are studied and different design approaches are considered. New ideas are introduced, and simulations are used to show if it these work. A real prototype is developed. Results from the prototype are satisfactory and in good agreement with the simulation results. This allows for the possibility of a real portable NMR spectrometer 'Lapspec'. Points of note: • Feedback to stabilize amplifier, • Hard bias to improve rise time of pulse, • A rugged device is chosen, • Power limiter technology is used to avoid overdrive amplifier, • Lower value attenuator at output of final stage to reduce load VSWR, • Reason of spike is studied, the solution to reduce spike is given, • The reason of instability of amplifier with NMR load is analyzed, • A method is introduced to ensure there is no oscillation while the High Power Amplifier (HPA) is connected with the NMR probe.en_US
dc.identifier.urihttp://hdl.handle.net/10179/707
dc.language.isoenen_US
dc.publisherMassey Universityen_US
dc.rightsThe Authoren_US
dc.subjectRF high power amplifiersen_US
dc.subjectNMR spectrometersen_US
dc.subject.otherFields of Research::290000 Engineering and Technology::290900 Electrical and Electronic Engineeringen_US
dc.titleThe development of a pulse RF high power amplifier for a portable NMR spectrometer : a thesis presented in partial fulfillment of the requirement for the degree of Master of Engineering at Massey Universityen_US
dc.typeThesisen_US
massey.contributor.authorJiang, Tianyang Ted
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorMassey Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Engineering (M.E.)en_US
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