Ultra compact multi-mode filter with novel rat-race inductor

A monolithic integrated filter with mode conversion and impedance transformation for GSM 900 is presented. Hereby, a so called rat-race inductor is utilized, replacing up to six conventional inductors and one transformer, resulting in a reduction in chip size by approximately 50 %. The rat-race indu...

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Bibliographic Details
Main Authors: Sadeghfam, A., Heuermann, H., Boehm, H.
Format: Conference Proceeding
Language:English
Subjects:
Capacitors
Circuit simulation
Coupling circuits
Delta modulation
Equivalent circuits
Filters
GSM
Impedance matching
Inductors
Mutual coupling
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Description
Summary:A monolithic integrated filter with mode conversion and impedance transformation for GSM 900 is presented. Hereby, a so called rat-race inductor is utilized, replacing up to six conventional inductors and one transformer, resulting in a reduction in chip size by approximately 50 %. The rat-race inductor is handled theoretically and 3D-EM based simulations are carried out, verifying the proposed structures and expected results. A first wafer run is to be fabricated on Infineon Technologies P7MI semiconductor process. The insertion loss of the filter is as low as 2.3 dB accompanied by a phase imbalance of less than 5/spl deg/ and an amplitude imbalance of less than 0.5 dB.
DOI:10.1109/EUMC.2005.1610177