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In this paper, a systematic analysis of the integrated balun circuits based on the principle of transformers is presented. Firstly, the characteristics of an ideal transformer is discussed. Then, equivalent circuits for an actual balun are presented, where the standard and mixed-mode S-parameters for the baluns are derived. Finally, ADS simulation results for balun circuits are presented to validate...
A new approach to parameter extraction for on-chip symmetric transformers based on measured four-port S-parameters is proposed. Based on circuit analysis, open-loaded and short-loaded Y parameters are first used to derive the coupling parameters and all the other model parameters are derived from the corresponding analytical equations. As verified by a set of transformers fabricated on a standard...
An equivalent circuit has been developed for a four-port RF transformer by exploiting the symmetry of the device. The circuit consists of four driving-point admittance RLC networks mutually connected via a transforming circuitry, ensuring the symmetry. The measured 4-port frequency responses are converted to respective driving-point admittances, which are approximated by fitting the values of the...
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