A 5-V AC-Powered CMOS Filter-Selectivity Booster for POTS/ADSL Splitter Size Reduction

April 27, 2007
Time: 2:00pm-3:00pm
414 - CEPSR
Hosted by: Columbia Integrated System Laboratory
Speaker: Dr. Säckinge, Conexant Systems, Inc.


An active POTS filter consisting of a small external L-C low-pass filter and a selectivity booster chip is presented. The filter achieves an ADSL attenuation of more than 70dB at 30kHz while maintaining a passband flatness of 0.2dB. This active filter requires fewer transformers and is smaller than a passive filter with the same performance. The 0.5um CMOS booster chip contains a 5th-order continuous-time filter, a low output-impedance driver, and an active rectifier and consumes 50mW from a 5V AC supply.

Speaker Biography

Eduard Säckinger (S'84--M'91) was born in Basel, Switzerland. He received the Diploma and Ph.D. degrees in electrical engineering from the Swiss Federal Institute of Technology (ETH), Zurich, Switzerland, in 1983 and 1989, respectively. From 1989 to 2001, he was with the research division of Bell Laboratories in Holmdel, NJ where he worked on VLSI chips for artificial neural-networks and multiprocessor DSPs. In 2001, he became a Distinguished Member of Technical Staff with Agere Systems, Inc. where he worked on analog front-end chips for optical fiber communication systems. Since 2004, he is Principal Engineer for Mixed Signal Design at Conexant Systems, Inc. in Red Bank, NJ. He is the author of the textbook Broadband Circuits for Optical Fiber Communication (Wiley, 2005) and he serves as an Associate Editor for the IEEE Journal of Solid-State Circuits.

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