1,721,047 research outputs found
Novel hardware and software solutions for a complete linear and non-linear microwave device characterization
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A computer-oriented design method for large-signal microwave transistor amplifiers
No full textA method for the design of large-signal microwave amplifiers using a quasi-black-box transistor model is described. It is based on design maps, drawn on the basis of a suitable large-signal mathematical model of the transistor, which permit a straightforward search for the load reflection coefficient which provides maximum saturated output power or, alternatively, a good compromise between conflicting gain and output power requirements. This method, besides being accurate enough for most amplifier design problems, is also quite simple to apply in practice, since the numerical computations involved can easily be programmed on a desk-top personal computer. The design procedures were implemented in a Fortran program running on an IBM AT personal computer, requiring 350-kB RAM and a very short (a few minutes) total computing time. The good agreement between predicted and measured performance confirms the validity of the method
Accuracy of a multiport network analyzer
Full text linkThe accuracy of a multiport vector network analyzer, which uses a new calibration concept, has been compared with a 2-port network analyzer that implements the classical TRL procedure. The accuracy assessment is based on the analysis of the error propagation due to the connectors repeatability, both of the used standards and the measurands. The comparison, performed in the 2-18 GHz band on devices fitted with APC-7 mm connectors, proved the high accuracy reached by a multiport system which can qualify for metrological applications
Comparison between a vector multiport network analyzer and the national S-parameter measurement system
Full text linkA multiport vector network analyzer based on a new calibration concept, has been compared with the P-port S-parameter National measurement system at IENGF. The measurements were performed on precision 7 mm standard components and exhibited an optimum agreement. These results open the possibility to use the new multiport network analyzer for certification measurements of multiport device
Studio e progetto di mescolatori SIS per applicazioni astrofisiche nella banda submillimetrica
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