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This paper deals with the implementation of an Envelope Load-Pull system suitable for GaN HEMT power transistors characterization. The novelty of the system, compared with previous Envelope Load-Pull systems lies in its capability to work with packaged transistors at 3.5GHz and a 15W output, scalable up to 20W. Furthermore, due to broadband components, the system presented is easily scalable up to...
The thru-reflect-match (TRM) calibration technique uses as calibration structures a thru, a pair of highly reflecting loads and two loads of impedance close to the measuring system impedance (Z0). In practice, the loads used as match standard may be nonsymmetrical and of impedance different from Z0. By using the ABCD-parameters matrix formalism, in this paper the calibration of a load-pull system...
The classical method for extracting the intrinsic elements of the small signal equivalent circuit of the FET is based on the knowledge of intrinsic Yij-parameters. It requires finding the frequency range where the value of each intrinsic element is frequency independent. Using the extrema (maximum or minimum) points of the intrinsic Yij-parameters, this work proposes a new and reliable method for...
An improved two-tier L-L method for characterizing symmetrical microwave test fixtures is introduced in this paper. The improved two-tier L-L method is implemented with two uniform transmission lines having the same characteristic impedance and propagation constants, but different lengths. The ABCD parameters of the test fixture and the embedded device under test (DUT) can be determined by measurements...
By biasing the AlGaN/GaN HEMTs with low DC gate forward current and floating drain, a new method for extracting parasitic resistances and parasitic inductances is introduced. The originality of the proposed method lies in the low DC gate forward current used for extracting Rg and Lg. While the classical method for extracting Rg and Lg uses a set of SS-parameters measured under different large DC gate...
This paper presents a multiline TRL (Thru-Reflect Line) method that is based on a straightforward de-embedding method and a reliable method for determining a each frequency the value of a/c, b, and e-??1 terms. The main features of the proposed multiline TRL are: a) The transmission line propagation constant is not used, therefore the physical lengths of the lines are not needed, and b) The Gauss-Markov...
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