A 1.6Gb/s/pair electromagnetically coupled multidrop bus using modulated signaling

Abstract

AC coupling and pulse modulation are presented for high speed multidrop busses. A prototype eight module memory bus operates at a 400MHz symbol rate with 4 bits of modulated data per symbol, for 1.6Gb/s/pair. Test chips in 0.25/spl mu/m 3M CMOS dissipate 40mW peak and occupy 340/spl times/200/spl mu/m per pair.