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This paper presents an approach for investigating the operation of fully differential circuits that have internal nodes that are not available for direct measurement. This approach is based on a new method of extracting the electrical and noise parameters of the differential-circuit subcomponents. Two single-ended noise-parameter measurements and one measurement of S-parameters are required for the presented method. Simulations and measurements were used to confirm the viability of the method.INDEX TERMS Differential circuit, differential circuit dissection, noise-parameter measurement.

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