Equalizer and transmitter including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsGun-Il Kang, June-Hee Lee, Byung-Wook Cho
Life of this patent
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Abstract
An integrated circuit for generating an equalized signal, according to a channel, from serial data includes a shift register that extracts a symbol sequence from the serial data. A data storage stores values of an equalized digital signal corresponding to potential symbol sequences corresponding to a filter coefficient sequence. A lookup table outputs the equalized digital signal of a value corresponding to the extracted symbol sequence. A digital-to-analog converter (DAC) converts the equalized digital signal into the equalized signal. A controller refreshes the lookup table, based on at least one of values stored in the data storage and values included in the lookup table, in response to a control signal.
Claims17
An integrated circuit for generating an equalized signal from serial data according to a channel, the integrated circuit comprising:
- a shift register configured to extract a symbol sequence from the serial data;
- a data storage configured to store values of an equalized digital signal corresponding to potential symbol sequences corresponding to a filter coefficient sequence;
- a lookup table configured to output the equalized digital signal of a value corresponding to the symbol sequence;
- a digital-to-analog converter configured to convert the equalized digital signal into the equalized signal;
- and
- a controller configured to refresh the lookup table, based on at least one of values stored in the data storage and values included in the lookup table, in response to a control signal, wherein:
- the data storage stores values of the equalized digital signal grouped into a plurality of data sets corresponding to a plurality of filter coefficient sequences, and
- the controller is further configured to load one of the plurality of data sets into the lookup table based on the control signal.
A transmitter for transmitting input data through a channel, the transmitter comprising:
- a serializer configured to generate serial data from the input data;
- an equalizer comprising a finite impulse response (FIR) filter block configured to use a lookup table that outputs a digital signal corresponding to a symbol sequence extracted from the serial data, and a digital-to-analog converter configured to output an equalized signal by converting the digital signal;
- and
- a driver configured to amplify the equalized signal, wherein:
- the FIR filter block configured to refresh the lookup table based on channel information received through the channel, and
- the FIR filter block is further configured to refresh the lookup table by adding an offset of the digital signal corresponding to a variation of a filter coefficient.
A method for transmitting serial data through a channel, the method comprising:
- receiving a control signal generated based on channel information received through the channel;
- refreshing a lookup table configured to output an equalized digital signal from a symbol sequence in response to a control signal;
- extracting a symbol sequence from the serial data;
- providing the symbol sequence to the lookup table;
- and
- converting the equalized digital signal outputted from the lookup table into an analog signal, wherein
- the refreshing of the lookup table comprises refreshing the lookup table by adding an offset of the equalized digital signal corresponding to a variation of a filter coefficient.
Dependencies are inferred from the claim text.