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Integrated LC Filters

   The expansion of wireless communication systems and their broad commercial application in cellular phone and local area networks demands smaller and lower-cost transceivers operating at high carrier frequencies. High level of the transceiver integration is needed and a part of the effort in that direction is research in the area of the integrated LC filters.

   In a typical wireless receiver front end, there is a requirement for high frequency RF filters which have narrow fractional bandwidths and high dynamic range. Our project, here at Columbia Integrated Systems Laboratory, is to identify and address some of the challenging issues in the design of such on-chip LC filters in a standard CMOS process, and evaluate the efficiency of their use in today's wireless applications.

   As a part of this research, we have designed a 4th order Q-enhanced coupled resonator band pass filter with automatic tuning, targeted for use in WLAN applications. The testing of this filter is in progress.



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