Time dependent line equalizer for data transmission systems
View Patent ↗A data equalization system includes a data clock input configured to receive a clock signal. There is an input node operative to receive a data signal of transmission symbols that change state synchronously with the clock signal. There is a first tap coupled to the input node. A second tap is configured to receive a variation of the data signal. At least one of a weight of the first tap or a weight of the second tap is modulated by a dynamic control parameter that repeats synchronously with each transmission symbol.
1. A data equalization system, comprising:
a data clock input configured to receive a clock signal;
an input node operative to receive a data signal of transmission symbols that change state synchronously with the clock signal;
a first tap coupled to the input node; and
a second tap configured to receive a variation of the data signal,
wherein at least one of a weight of the first tap or a weight of the second tap is modulated by a dynamic control parameter during the transmission symbol that repeats synchronously with each transmission symbol.
2. The data equalization system of claim 1 , wherein the variation of the data signal is a time delay of the data signal.
3. The data equalization system of claim 1 , wherein the dynamic control parameter provides a time-dependent functional transformation of an input time sequence of the transmission symbols.
4. The data equalization system of claim 1 , wherein the data equalization system is a feed forward equalizer (FFE).
5. The data equalization system of claim 1 , wherein the data equalization system is part of a transmitter circuit.
6. The data equalization system of claim 1 , wherein the data equalization system is part of a receiver circuit.
7. The data equalization system of claim 1 , wherein the dynamic control parameter is a linear ramp.
8. The data equalization system of claim 1 , wherein the dynamic control parameter is a non-linear function.
9. The data equalization system of claim 1 , wherein:
the first and second taps are part of a plurality of taps, and
at least one of the plurality of taps has a tap weight that is controlled statically with each transmission symbol.
10. The data equalization system of claim 1 , wherein:
the first tap is a precursor tap that has a tap weight that is constant for each transmission symbol, and
the second tap is a first postcursor tap that has a tap weight that is modulated by the dynamic control parameter.
11. The data equalization system of claim 1 , wherein the dynamic control parameter is differential.
12. A method of equalization, the method comprising:
providing an equalization system having a first tap and a second tap;
receiving a data clock;
receiving a data input of transmission symbols that change state synchronously with the data clock;
modulating a tap weight of at least one of the first tap or the second tap with a dynamic control parameter during the transmission symbol that repeats synchronously with each transmission symbol of the data clock;
summing a weight of all taps in the equalization system; and
providing an output data based on the summed weight of all taps in the system.
13. The method of claim 12 , wherein the second tap receives a time delayed version of the data input.
14. The method of claim 12 , wherein the dynamic control parameter provides a time-dependent functional transformation of an input time sequence of the transmission symbols.
15. The method of claim 12 , wherein the data equalization system is a feed forward equalizer (FFE).
16. The method of claim 12 , wherein the dynamic control parameter is a linear ramp.
17. The method of claim 12 , wherein the dynamic control parameter is a non-linear function.
18. The method of claim 12 , wherein:
the first and second taps are part of a plurality of taps, and
at least one of the plurality of taps has a tap weight that is controlled statically with each transmission symbol.
19. The method of claim 12 , further comprising:
keeping a weight of the first tap constant for each transmission symbol; and
modulating a weight of the second tap by the dynamic control parameter.
20. The method of claim 12 , wherein the weight of at least one of the first tap or the second tap are controlled by the dynamic control parameter differentially.
21. A computing device comprising:
a processor;
a network interface coupled to the processor to enable communication over a network;
an equalization engine coupled to the processor and configured to perform acts comprising:
receiving a data clock;
receiving a data input of transmission symbols that change state synchronously with the data clock;
modulating a tap weight of at least one of the first tap or the second tap by a dynamic control parameter during the transmission symbol that repeats synchronously with each transmission symbol of the data clock;
summing a weight of all taps in the system; and
providing an output data based on the summed weight of all taps in the system.
22. The computing device of claim 20 , wherein the dynamic control parameter provides a time-dependent functional transformation of an input time sequence of the transmission symbols.
23. The computing device of claim 20 , wherein the dynamic control parameter is a linear ramp.
24. The computing device of claim 20 , wherein the dynamic control parameter is a non-linear function.
25. A non-transitory computer readable storage medium tangibly embodying a computer readable program code having computer readable instructions that, when executed, causes a computer device to carry out a method of equalizing a signal, the method comprising:
receiving a data clock;
receiving a data input of transmission symbols that change state synchronously with the data clock;
modulating a tap weight of at least one of the first tap or the second tap by a dynamic control parameter during the transmission symbol that repeats synchronously with each transmission symbol of the data clock;
summing a weight of all taps in the system; and
providing an output data based on the summed weight of all taps in the system.