Patent ID: 8379701
Filing Date: 2013-02-19
Classification: H04B

Abstract:
1. A transmission line pre-emphasis circuit, comprising: a primary signal path coupled to receive a digital data stream to be transmitted and provide a primary differential output current indicative of the digital data stream; one or more secondary signal paths each incorporating a network implementing a specific transient response, the one or more secondary signal paths receiving the digital data stream and generating secondary differential output currents representing one or more overshoot signals indicative of the transient response of the respective network and synchronized with transitions of the digital data stream, the one or more secondary signal paths receiving a pair of programmable bias currents that vary an amplitude and/or a width of the one or more overshoot signals, the differential secondary output currents being summed with the primary differential output current of the primary signal path; and an output loading stage coupled to receive the summed differential output current to generate a pre-emphasized digital output signal to be transmitted onto a transmission line indicative of the one or more overshoot signals added to and synchronized with transitions of the digital data stream.