High speed data link with transmitter equalization and receiver equalization
AssigneeBroadcom Corporation
InventorsPieter Vorenkamp, Aaron Buchwald
Life of this patent
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Abstract
A high speed data link includes transmitter equalization and (passive) receiver equalization to compensate for frequency distortion of the data link. In one embodiment, the transmitter equalization is performed with a de-emphasis circuit. The transmitter de-emphasis circuit pre-distorts an input signal to compensate for at least some of the frequency distortion in the data caused by the transmission line. The (passive) receive equalization circuit further compensates for the frequency distortion at the output of the transmission line to flatten the amplitude response of the output signal, and thereby reduce inter-symbol interference, improve media reach and improve the bit error rate (BER).
Claims28
A data link, comprising:
- a transmission line having an input and an output;
- a transmitter de-emphasis circuit coupled to said input of said transmission line;
- and
- an equalizer coupled to said output of said transmission line.
A method of communicating data across a data link, comprising:
- receiving a data signal at a first node;
- de-emphasizing, at said first node, low frequency components of said data signal relative to high frequency components in said data signal;
- transmitting said data signal across a transmission line from said first node to a second node;
- receiving said data signal at said second node responsive to said transmitting step;
- and
- de-emphasizing, at said second node, low frequency components of said data signal relative to high frequency components of data signal.
A data link, comprising:
- a transmission line having an input and an output;
- a transmitter circuit with equalization coupled to said input of said transmission line;
- and
- an equalizer coupled to said output of said transmission line.
A method of communicating data across a data link, comprising:
- receiving a data signal at a first node;
- equalizing said data signal at said first node;
- transmitting said data signal across a transmission line from said first node to a second node;
- receiving said data signal at said second node responsive to said transmitting step;
- and
- equalizing said data signal at said second node.
Dependencies are inferred from the claim text.