What Can DECISION FEEDBACK EQUALIZATION (DFE) Do for You?

摘要

Decision feedback equalization (DFE) is becoming increasingly popular for high-speed digital cirquits. This form of equalization has been around for a while in the SerDes world, where it is standard for protocols such as PCIE-G3. The equalization scheme is now also working its way into the world of DDR, where DDR5 is slated to incorporate DFE in DRAMs. What is DFE, and how does it work? The following is an attempt to highlight an intuitive approach for understanding DFE.