A CMOS 80mW 400MHz seventh-order MLF FLF linear phase filter with gain boost

Abstract

???This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder." ???Copyright IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.???A 400MHz CMOS seventh-order linear phase gm-C filter based on current-mode (CM) follow-the-leader-feedback (FLF) 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 0.18mum CMOS process and with 2.5V power supply have shown that the cut-off frequency of the filter ranges from 290MHz to 430MHz and dynamic range is about 54dB. The group delay ripple is approximately 6% over the whole tuning range and total power consumption is only 78.7mW at 400MHz cut-off frequency

Performance comparison of high-order IFLF and LF linear phase lowpass OTA-C filters with and without gain boost

“…The realizability of arbitrary transmission zeros, regularity and simplicity of the filter structures, and explicit and straightforward formulas available have made the MLF method a strong alternative. MLF OTA-C filters have been used in several applications such as anti-aliasing in video signal processing [10], wireless transceiver baseband channel selection [11][12][13][14], magnetic recording channel equalisation [15,16], linear phase filtering in computer hard disk drive systems [17][18][19][20][21][22][23].…”