Patent ID: 8896353
Filing Date: 2014-11-25
Classification: H03K,H04L

Abstract:
1. A method for pre-emphasis drive, comprising: driving a driver output according to a given pre-emphasis at a given output impedance, by driving a driver output with a population of n drivers in parallel to the driver output and a concurrent a population of m pre-emphasis path drivers in parallel to the driver output, wherein the sum of n and m is P, wherein the ratio of n to m is based on the given pre-emphasis, and wherein each of the m pre-emphasis drivers has an output impedance of P times the given output impedance and wherein each of the n drivers has an output impedance of P times the given output impedance; and driving the driver output according to an updated pre-emphasis at said given output impedance, by updating the population of pre-emphasis path drivers from m to m′ and the population of drivers from n to n′, wherein said updating updates m to m′ in an inverse relation to the updating of n to n′ such that the sum of n′ and m′ is maintained at approximately P, and wherein the ratio of n′ to m′ is based on the updated pre-emphasis.