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US 2019/0207789 A1Published application
Baseline wander correction in ac coupled communication links using equalizer with active feedback
AssigneeOracle International Corporation
InventorsKunmo Kim, Rajesh Kumar, Dawei Huang, Frankie Liu, Suwen Yang
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Abstract
A method and apparatus for correcting baseline wander is disclosed. The method and apparatus may include generating filtered signals by filtering input signals using a filter circuit. An equalizer circuit using the filtered signals may generate output signals. Feedback networks may be configured to couple a respective output signal to a corresponding filtered signal.
Claims20
An apparatus, comprising:
- a filter circuit configured to filter a first input signal and a second input signal to generate a first filtered signal and a second filtered signal, wherein the first input signal and the second input signal are received via a communication link;
- an equalizer circuit coupled to the filter circuit, wherein the equalizer circuit is configured to amplify a difference between a voltage level of the first filtered signal and a voltage level of the second filtered signal to generate a first output signal and a second output signal;
- a first feedback network configured to couple the first output signal of the equalizer circuit to the first filtered signal;
- and
- a second feedback network configured to couple the second output signal to the second filtered signal.
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A method, comprising:
- filtering, by a filter circuit coupled to a communication link, a first input signal to generate a first filtered signal;
- filtering, by the filter circuit, a second input signal to generate a second filtered signal;
- amplifying, by an equalizer circuit, a difference between a voltage level of the first filtered signal and the second filtered signal to generate a first output signal and a second output signal;
- coupling the first output signal to the first filtered signal by a first feedback network;
- and
- coupling the second output signal to the second filtered signal by a second feedback network.
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A system, comprising:
- a first device configured to transmit data using a first signal and a second signal;
- and
- a second device configured to:
- receive the first signal and the second signal;
- filter the first signal to generate a first filtered signal;
- filter the second signal to generate a second filtered signal;
- amplify a difference between a voltage level of the first filtered signal and a voltage level of the signal filtered signal to generate a first output signal and a second output signal;
- couple the first output signal to the first filtered signal;
- and
- couple the second output signal to the second filtered signal.
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Dependencies are inferred from the claim text.