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Group-Delay Engineered Noncommensurate Transmission Line All-Pass Network for Analog Signal Processing

Abstract : A group-delay engineered noncommensurate transmission line two-port all-pass network for analog signal-processing applications is presented, analytically modeled, and experimentally demonstrated. This network consists of transversally cascaded C-sections, which are distributed implementations of the bridged-T equalizer lumped circuit. It is obtained by interconnecting the alternate ports of adjacent lines of a 2N -port coupled transmission line network with transmission line sections, and it is modeled using multiconductor transmission line theory with per-unit-length capacitance matrix C and inductance matrix L. By allowing the different C-sections of the network to exhibit different lengths, a generalized group-delay engineering procedure is proposed, where quasi-arbitrary group-delay responses are achieved by combining the group-delay responses of C-sections with different lengths. A computer design approach based on genetic algorithms is applied for synthesis, which consists of determining the structural parameters of the different C-section groups. Using this approach, noncommensurate networks are group-delay engineered in edge-coupled stripline technology, and Gaussian, linear and quadratic group-delay responses are realized. The theoretical results are validated by experiment. Finally, two application examples of analog signal processing-a tunable impulse delay line and a real-time frequency discriminator-using the proposed dispersive noncommensurate all-pass networks are presented.
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Submitted on : Friday, July 11, 2014 - 3:12:17 PM
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Shulab Gupta, A. Parsa, Etienne Perret, R.V. Snyder, R.J. Wenzel, et al.. Group-Delay Engineered Noncommensurate Transmission Line All-Pass Network for Analog Signal Processing. IEEE Transactions on Microwave Theory and Techniques, Institute of Electrical and Electronics Engineers, 2010, 58 (9), pp.2392-2407. ⟨10.1109/tmtt.2010.2058933⟩. ⟨hal-01023127⟩



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