A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning

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Title: A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning
Author: Pandey, Pankaj
Abstract: The growing demand of portable electronic equipment and system -on -a -chip has been pushing the industry to design circuits with very low power supply voltage and low power consumption . The Hard Disk drive industry is looking for developments in the read channel chip to push the data rates to higher speed , along with a low voltage and low cost solution . Read channel requires high -speed linear phase filters to meet these objectives . The primary objective of this project is to design , layout , and characterize a 4th -order continuous -time equiripple linear phase filter with automatic tuning system . The main requirements for design are high speed , low group delay variations , good linearity and power efficiency . This filter features wide cut -off frequency 500MHz , which is far beyond the current state -of -the -art . The linear phase filter is based on Gm -C biquadratics . Higher speed has been achieved by minimizing the parasitics and a complementary input stage OTA . A common mode feedback (CMFB ) , which ensures stability at such high frequencies , has also been designed . The inaccuracies of the filter are compensated by using a simple automatic tuning system . The design is fabricated in 0 .35 um TSMC CMOS process technology . The design was simulated in Cadence using SPICE models provided by MOSIS for the 0 .35 um TSMC process in the presence of parasitic capacitance and transistor non -idealities . Cut -off frequency of 500 MHz was achieved along with a 9 % variation in the group delay .
URI: http : / /hdl .handle .net /1969 .1 /68
Date: 2004-09-30

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A CMOS 500MHz continuous-time fourth order 0.05degree equiripple linear phase filter with automatic tuning. Available electronically from http : / /hdl .handle .net /1969 .1 /68 .

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