Receiver with selectable digital equalization filter options
AssigneeTexas Instruments Incorporated
InventorsRaghu GANESAN, Kalpesh Laxmanbhai RAJAI, Saravanakkumar Swaminathan RADHAKRISHNAN
Life of this patent
Estimating the term…
Abstract
A device includes a receiver having analog front-end circuitry and a digital signal processing (DSP) circuit. The DSP circuit is configured to select one of a plurality of digital equalization (DEQ) filter options and to perform DEQ operations based on the selected DEQ filter option, wherein the DSP circuit is configured to select one of the plurality of DEQ filter options based on a channel length estimate and a plurality of different sets of DEQ filter coefficients predetermined for different channel lengths.
Claims23
A device, comprising:
- a receiver having:
- analog front-end circuitry;
- and
- a digital signal processing (DSP) circuit, wherein the DSP circuit is configured to select one of a plurality of digital equalization (DEQ) filter options and to perform equalization operations based on the selected filter option, and wherein the DSP circuit is configured to select one of the plurality of DEQ filter options based on a channel length estimate and a plurality of different sets of DEQ filter coefficients predetermined for different channel lengths.
A digital signal processing (DSP) circuit, comprising:
- a digital equalizer (DEQ) filter with selectable coefficients;
- a decision circuit coupled to the DEQ filter;
- a decision-feedback equalizer (DFE) circuit coupled to the DEQ filter;
- a gain loop circuit coupled to the DEQ filter;
- a clock recovery circuit coupled to the decision circuit;
- and
- a controller coupled to the DEQ filter, wherein the controller is configured to select the coefficients for the DEQ filter based on at least one selection criterion.
A method, comprising:
- receiving an input signal;
- filtering the input signal using an analog filter system;
- converting an output of the analog filter system to a digital signal;
- selecting one of a plurality of digital equalization (DEQ) filter options;
- and
- filtering the digital signal based on the selected DEQ filter option.
Dependencies are inferred from the claim text.