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Reconfigurable Transceiver Architecture for Multiband RF-Frontends pp 41–69Cite as

System Level Modeling for Tunable Components

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Part of the book series: Smart Sensors, Measurement and Instrumentation ((SSMI,volume 17))

Abstract

As shown in the previous chapter, the response over the complete frequency range presents different amplitude values derived from the variation in the impedance matching at discrete frequencies. Ideally, a wide impedance matching in the considered frequency range is desired to hold a certain quality of signal at all operation bands. However, fundamental limitations indicate that in order to obtain a perfect impedance matching, a reduction of the available bandwidth is present at a certain frequency. As a result, the matching requires to be adapted by finding a compromise considering the minimum tolerance on the magnitude of the input reflection over the prescribed frequency (Bode, Network analysis and feedback amplifier design, D. Van Nostrand Company, New York, 1945, Fano, Theoretical limitations on the broadband matching of arbitrary impedances. Technical report, Massachusetts Institute of Technology, Research Laboratory of Electronics, 1948). As shown in Fig. 4.1 this improvement can be realized by employing tunable components to dynamically cover a frequency range, to reduce the noise of diverse sources of distortion and to improve the impedance matching at an operation frequency considering a narrowband signal.

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Notes

  1. 1.

    The effect of a frequency response is considered dispersive when the frequency and the phase are not linearly connected, e.g. by the phase velocity of the wave \(v=\frac{\omega }{k}=\frac{1}{\sqrt{\mu \varepsilon }}\) [11].

  2. 2.

    Up to five carriers with a bandwidth of up to \({20} \, \mathrm{MHz}\) each can be aggregated in LTE-Advanced. Furthermore, data rates of the order of \({1} \, \mathrm{Gbps}\) might theoretically be achieved using contiguous bandwidths of \({40} \, \mathrm{MHz}\) or more [29].

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  1. Institut für Mikrowellentechnik und Photonik (IMP), Fachbereich Elektrotechnik und Informationstechnik (ETiT) D17, Technische Universität Darmstadt, Darmstadt, Germany

    Erick Gonzalez Rodriguez

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Gonzalez Rodriguez, E. (2016). System Level Modeling for Tunable Components. In: Reconfigurable Transceiver Architecture for Multiband RF-Frontends. Smart Sensors, Measurement and Instrumentation, vol 17. Springer, Cham. https://doi.org/10.1007/978-3-319-24581-2_4

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  • DOI: https://doi.org/10.1007/978-3-319-24581-2_4

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