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).
Claims12
A data link system configured to operate with a differential transmission line having a differential input and a differential output, the data link system comprising:
- a transmitter de-emphasis circuit coupled to said input of said differential transmission line, said transmitter de-emphasis circuit including,
- a first transconductance device having a fixed gain;
- a second transconductance device, coupled in parallel with said first transconductance device, and having a variable gain;
- and
- a summer device for summing current outputs of said first and second transconductance devices;
- and
- an equalizer coupled to said differential output of said differential transmission line, said equalizer having an inductor connected between first and second transmission lines forming said differential transmission line.
Dependencies are inferred from the claim text.