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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 16 Apr 2024 16:12:47 +0000Noise waves and passive linear multiports
https://resolver.caltech.edu/CaltechAUTHORS:WEDieeemgwl91
Authors: {'items': [{'id': 'Wedge-S-W', 'name': {'family': 'Wedge', 'given': 'Scott W.'}}, {'id': 'Rutledge-D-B', 'name': {'family': 'Rutledge', 'given': 'David B.'}}]}
Year: 1991
DOI: 10.1109/75.89082
Noise waves are a powerful means for characterizing noise in microwave circuits. A simple derivation is given for the relation between a passive circuit's noise-wave correlation matrix and its scattering matrix. It is shown that this relation, referred to as Bosma's theorem, can be readily derived from the fundamental principle that a passive multiport in thermodynamic equilibrium with reflectionless terminations produces uncorrelated output waves.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/5n14e-22492Wave techniques for noise modeling and measurement
https://resolver.caltech.edu/CaltechAUTHORS:WEDieeemtt92
Authors: {'items': [{'id': 'Wedge-S-W', 'name': {'family': 'Wedge', 'given': 'Scott W.'}}, {'id': 'Rutledge-D-B', 'name': {'family': 'Rutledge', 'given': 'David B.'}}]}
Year: 1992
DOI: 10.1109/22.168757
The noise wave approach is applied to analysis, modeling, and measurement applications. Methods are presented for the calculation of component and network noise wave correlation matrices. Embedding calculations, relations to two-port figures-of-merit, and transformations to traditional representations are discussed. Simple expressions are derived for MESFET and HEMT noise wave parameters based on a linear equivalent circuit. A noise wave measurement technique is presented and experimentally compared with the conventional method.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/w2bb2-vfb94Wave computations for microwave education
https://resolver.caltech.edu/CaltechAUTHORS:WEDieeete93
Authors: {'items': [{'id': 'Wedge-S-W', 'name': {'family': 'Wedge', 'given': 'Scott W.'}}, {'id': 'Rutledge-D-B', 'name': {'family': 'Rutledge', 'given': 'David B.'}}]}
Year: 1993
DOI: 10.1109/13.204831
The analysis of even simple microwave circuits can involve complicated calculations. It is argued that students repeatedly forced through this exercise are left exhausted and never develop understanding and insight into the principles of high-frequency circuit design. The use of computer-aided design software eliminates the network analysis burden, but it is a precarious solution: students easily become dependent on software and never develop analytical skills. A simple wave computational approach to microwave network analysis is discussed. The method is derived from Mason's theory of signal flow graphs and is based on wave variables and scattering parameters. The approach is easily understood and applied as either an analytical tool, or within a microwave CAD analysis engine. PC software using this computational technique is described and its educational applications are discussed.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/4629z-7n629A 10-Watt X-Band Grid Oscillator
https://resolver.caltech.edu/CaltechAUTHORS:20120306-124144454
Authors: {'items': [{'id': 'Hacker-J-B', 'name': {'family': 'Hacker', 'given': 'Jonathan B.'}}, {'id': 'De-Lisio-M-P', 'name': {'family': 'De Lisio', 'given': 'Michael P.'}}, {'id': 'Kim-M', 'name': {'family': 'Kim', 'given': 'Moonil'}}, {'id': 'Liu-C-M', 'name': {'family': 'Liu', 'given': 'Cheh-Ming'}}, {'id': 'Li-S-J', 'name': {'family': 'Li', 'given': 'Shi-Jie'}}, {'id': 'Wedge-S-W', 'name': {'family': 'Wedge', 'given': 'Scott W.'}}, {'id': 'Rutledge-D-B', 'name': {'family': 'Rutledge', 'given': 'David B.'}}]}
Year: 1994
DOI: 10.1109/MWSYM.1994.335230
A 100-transistor MESFET grid oscillator has been fabricated that generates an effective radiated power of 660 W at 9.8 GHz and has a directivity of 18.0 dB. This corresponds to a total radiated power of 10.3 W, or 103 mW per device. This is the largest recorded output power for a grid oscillator. The grid drain-source bias voltage is 7.4 V and the total drain current for the grid is 6.0 A, resulting in an overall dc-to-rf efficiency of 23%. The pattern of the SSB noise-to-carrier ratio was measured and found to be essentially independent of the radiation angle. The average SSB noise level was -87 dBc/Hz at an offset of 150 kHz from the carrier. An average improvement in the SSB noise-to-carrier ratio of 5 dB was measured for a 100-transistor grid compared to a 16-transistor gridhttps://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/1cdf5-rbk34