Characterization of Integrated Transmission Lines for RF Bandpass S? Modulators

Conference: PRIME 2012 - 8th Conference on Ph.D. Research in Microelectronics & Electronics
06/12/2012 - 06/15/2012 at Aachen, Germany

Proceedings: PRIME 2012

Pages: 4Language: englishTyp: PDF

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Zahabi, Ali; Anis, Muhammad; Ortmanns, Maurits (Institute of Microelectronics, University of Ulm, Ulm, Germany)

The specifications of microstrip (MS), coplanar waveguide (CPW) and various tapered transmission lines (TLs) intended for an integrated RF TL based σ δ modulator (ITLSDM) are discussed. The EM simulator Sonnet is used to achieve accurate models for TLs in a 0.25um BiCMOS technology. The physical parameters of different TLs are compared in order to achieve the guidelines, which ends up to a saved area and power consumption in the modulator. The equations for an area efficient meandering is given, which shows the area-quality factor trade-off. The results are supported with theoretical facts and verified with a resonator employed in a 4th order fs/4 bandpass SDM tuned at a center frequency of 2.5 GHz. Index Terms -integrated transmission line (ITL), sigmadelta modulator (SDM), resonator.