A 3-V, 10-100-MHz continuous-time seventh-order 0.05° equiripple linear phase filter

Abstract

A 3-V continuous-time Gm-C filter based on a seventh-order 0.05/spl deg/ equiripple response is presented for read channels. The design features a low-voltage, wide-dynamic-range transconductor, a stable biasing scheme, and a power-efficient filter architecture. The filter is tunable for cutoff frequencies from 10 to 100 MHz and provides up to 13 dB of magnitude boost and up to /spl plusmn/30% of group delay adjustment for use in high-data-rate, extended partial-response maximum-likelihood channels. The filter is implemented in 0.29-/spl mu/m BiCMOS technology, occupies 0.5 mm/sup 2/, and dissipates 120 mW.