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Nonlinear harmonic modeling of phemt devices for increased power amplifier efficiencies
| dc.creator | Strassner, Bernd Herbert | |
| dc.date.accessioned | 2012-06-07T22:50:42Z | |
| dc.date.available | 2012-06-07T22:50:42Z | |
| dc.date.created | 1997 | |
| dc.date.issued | 1997 | |
| dc.identifier.uri | https://hdl.handle.net/1969.1/ETD-TAMU-1997-THESIS-S765 | |
| dc.description | Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item. | en |
| dc.description | Includes bibliographical references: p.120-122. | en |
| dc.description | Issued also on microfiche from Lange Micrographics. | en |
| dc.description.abstract | This thesis is a comprehensive study of how harmonic terminations can greatly increase a power amplifier's efficiency (PAE). To show this improvement, the PHEMT amplifier is biased in the low noise region of operation (L, = 20 mA, Vd, = 3 V) and operated at a frequency of 2.2 GHz. An attempt is made to generate a working model which characterizes the amplifier's performance with and without harmonic termination. Both measured and modeled data are compared in order to verify the model's performance. Once a working model is realized, the designing of an amplifier can be done by simulation without the cumbersome task of taking measurements. The measured data is obtained using an electronic load pull system which is capable of rapid data acquisition. This study shows that when harmonic termination is used, the PAE can improve in some cases by about 15 % depending upon the operating conditions of the device. This improved PA-E can result in longer operational lifetimes of devices such as cellular phones and reduce the size of these units. Longer lifetimes are extremely important especially for space applications where replacement of power supplies is very costly. Power measurements as well as relevant intermodulation distortion measurements are also done for Class A and Class B operation in order to show the advantages and disadvantages of each. | en |
| dc.format.medium | electronic | en |
| dc.format.mimetype | application/pdf | |
| dc.language.iso | en_US | |
| dc.publisher | Texas A&M University | |
| dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
| dc.subject | Electrical Engineering. | en |
| dc.subject | Major Electrical Engineering. | en |
| dc.title | Nonlinear harmonic modeling of phemt devices for increased power amplifier efficiencies | en |
| dc.type | Thesis | en |
| thesis.degree.discipline | Electrical Engineering | en |
| thesis.degree.name | M.S. | en |
| thesis.degree.level | Masters | en |
| dc.type.genre | thesis | en |
| dc.type.material | text | en |
| dc.format.digitalOrigin | reformatted digital | en |
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