Receiver with Feed Forward Equalization
AssigneeApple Inc.
InventorsBo Sun, Jafar Savoj
Life of this patent
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Abstract
A receiver with feed-forward equalization is disclosed. A receiver includes a delay circuit configured to receive a first signal that encodes a serial data stream having a plurality of data symbols. The delay circuit includes at least one T-coil circuit and is configured to generate a plurality of delayed signals using the first signal. The receiver further includes a front-end circuit configured to generate an equalized signal using the at first signal and one or more delayed signals of the plurality of delayed signals. A sample circuit is configured to sample the equalized signal to generate a plurality of samples. A recovery circuit configured to generate a plurality of recovered data symbols using the plurality of samples.
Claims20
An apparatus, comprising:
- a delay circuit configured to receive a first signal that encodes a serial data stream that includes a plurality of data symbols, wherein the delay circuit includes at least one T-coil circuit and is configured to generate a plurality of delayed signals using the first signal;
- a front-end circuit configured to generate an equalized signal using the first signal and one or more delayed signals of the plurality of delayed signals, wherein the first signal is provided to the front-end circuit without applying a delay, and wherein, in generating the equalized signal, the front-end circuit is configured to generate one or more cancellation signals to cancel a precursor present in the first signal;
- a sample circuit configured to sample the equalized signal to generate a plurality of samples;
- and
- a recovery circuit configured to generate a plurality of recovered data symbols using the plurality of samples.
A method comprising:
- receiving, at a delay circuit having at least one T-coil circuit, a first signal that encodes a serial data stream that includes a plurality of data symbols;
- generating, using the delay circuit and based on the first signal, a plurality of delayed signals;
- generating, using a front-end circuit, an equalized signal based on the first signal and one or more delayed signals of the plurality of delayed signals, wherein, in generating the equalized signal includes applying the first signal to the front-end circuit without applying a delay, and further includes generating and using one or more cancellation signals to cancel a precursor from the first signal;
- generating a plurality of samples by sampling the equalized signal;
- and
- generating, using a recovery circuit, a plurality of recovered data symbols from the plurality of samples.
A circuit comprising:
- a plurality of serially-coupled T-coil circuits including a first T-coil circuit, wherein the first T-coil circuit is coupled to receive an incoming signal having a plurality of symbols, and wherein ones of the plurality of serially coupled T-coil circuits are configured to generate respective ones of a plurality of delayed signals using the incoming signal;
- a front-end circuit coupled to a plurality of taps of the plurality of serially-coupled T-coil circuits, wherein the front-end circuit is configured to generate an equalized signal using the incoming signal and ones of the plurality of delayed signals, wherein the incoming signal is provided to the front-end circuit without applying a delay, and wherein, in generating the equalized signal, the front-end circuit is configured to generate one or more cancellation signals to cancel a precursor present in the incoming signal;
- a sample circuit configured to a generate a plurality of samples using the equalized signal;
- and
- a recovery circuit configured to generate a plurality of recovered data symbols based on the plurality of samples.
Dependencies are inferred from the claim text.