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US 7,583,753 B2Granted
Methods and transmitters for loop-back adaptive pre-emphasis data transmission
AssigneeSamsung Electronics Co., Ltd.
InventorHitoshi Okamura
Life of this patent
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Abstract
A method of transmitting data can include pre-emphasizing data for transmission by a transmitter over a transmission line based on an error feedback signal provided to the transmitter from a receiver of the pre-emphasized data.
Claims20
An adaptive pre-emphasis apparatus comprising:
- a pre-emphasis circuit configured to pre-emphasize a serial data stream based on a pre-emphasis control value to transmit the pre-emphasized serial data stream to a receiver via a first transmission line;
- a pre-emphasis controller configured to receive measured values of transmission errors of the pre-emphasized serial data stream from the receiver via a second transmission line, and configured to set the pre-emphasis control value corresponding to a minimum measured value of the transmission errors, to an optimum pre-emphasis control value;
- wherein the pre-emphasis circuit comprises an output driver configured to receive serialized first input data and second input data that are inverted data of the serialized first input data, and configured to differentially amplify the first and the second input data;
- and
- wherein the pre-emphasis circuit further comprises a pre-emphasis driver configured to receive third input data that are delayed data of the first input data by a predetermined time period and fourth input data that are inverted data of the third input data, and configured to pre-emphasize the third and the fourth input data based on a pre-emphasis strength value to output the pre-emphasized third and fourth input data.
2 more elements
An adaptive pre-emphasis method comprising:
- pre-emphasizing a first serial data stream based on a plurality of pre-emphasis control values to transmit the pre-emphasized serial data stream to a receiver via a first transmission line;
- loop-backing the pre-emphasized serial data stream to a transmitter via a second transmission line;
- measuring transmission errors of a second serial data stream loop-backed through the receiver via the second transmission line;
- allocating the measured transmission error to each corresponding pre-emphasis control value;
- and
- setting the pre-emphasis control value corresponding to a minimum transmission error, to an optimum pre-emphasis strength value, wherein pre-emphasizing the first serial data stream comprises:
- receiving serialized first input data and second input data comprising inverted data of the serialized first input data, and differentially amplifying the first and the second input data;
- and
- receiving third input data comprising delayed data of the first input data by a predetermined time period and fourth input data comprising inverted data of the third input data, and pre-emphasizing the third and the fourth input data based on a pre-emphasis strength value to output the pre-emphasized third and fourth input data.
6 more elements
Dependencies are inferred from the claim text.