Back to results
US 6,687,286 B1Granted
Programmable transmitter circuit for coupling to an ethernet or fast ethernet
AssigneeAgere Systems Inc.
InventorsRobert Henry Leonowich, Ayal Shoval
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeAgere Systems Inc.
InventorsRobert Henry Leonowich, Ayal Shoval
Estimating the term…
A single, 10/100 twisted-pair driver for Ethernet and Fast Ethernet applications designed in a 0.25 μm, 3.3V, digital CMOS process is described. The combined driver sources either 10 Mbaud Manchester data or 125 Mbaud MLT3/NRZI data. In 10 Mbaud mode the driver incorporates programmable features such as an additional common-mode current for various linearity performance as function of power supply dissipation. In 125 Mbaud mode of operation, the driver can be configured for different duty cycle distortion and for various rise and fall-times as a trade-off in EMI performance and remote receiver cable length performance. As well, rise/fall-time asymmetry performance is programmable as a trade-off in supply power dissipation. The driver can be run optimally during a transition and sub-optimally when sending multiple “0” symbols to save power. These power dissipation numbers can be reduced through programmable modes when more relaxed performance targets are acceptable.
A programmable transmitter integrated circuit formed on a single circuit for receiving binary encoded data signals including Manchester encoded data signals, and having a transmitter output coupled to one of an Ethernet and a Fast Ethernet for providing a transmitter output signal encoded in accordance with one of (1) Manchester encoded output data signals (2) MLT3 line code output data signals and (3) NRZI line code output data signals;
Dependencies are inferred from the claim text.