University of Hertfordshire

A CMOS fifth-order 400MHz current-mode LF linear phase filter for hard disk read channels

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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Original languageEnglish
Title of host publicationProcs of the 18th European Conference on Circuit Theory and Design, ECCTD
ISBN (Print)1-4244-1342-7
Publication statusPublished - 2007


A 400 MHz CMOS fifth-order linear phase gm-c filter based on current-mode (CM) leapfrog (LF) structure is realized. The filter is implemented using a fully-differential linear operational transconductance amplifier (OTA) based on source degeneration topology. PSpice simulations in a standard TSMC 0.18 mum CMOS process and with 2.5 V power supply have shown that the cut-off frequency of the filter ranges from 330 MHz to 450 MHz and dynamic range is about 64 dB. The group delay is approximately 4% over the whole tuning range and total power consumption is only 190 mW at 400 MHz cut-off frequency.


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