Linear feedback equalization
AssigneeCredo Technology Group Limited
InventorsHaoli QIAN, Haihui LUO
Life of this patent
Estimating the term…
Abstract
A linear feedback equalizer includes comparators that digitize incoming analog signals. The equalizer further includes digital-to-analog converters (“DACs”) that transform a current digitized signal into one or more feedback analog signals. The equalizer further includes a subtractor that subtracts the feedback analog signals from the output of a continuous-time linear equalizer (“CTLE”) and provides the difference to the comparators as incoming analog signals.
Claims19
A linear feedback equalizer comprising:
- comparators that digitize an incoming analog signal to provide a multi-bit thermometer-coded digital signal;
- one or more digital-to-analog converters (“DACs”) that transform the thermometer-coded digital signal into one or more feedback analog signals each having a corresponding tap delay;
- and
- a subtractor that subtracts the one or more feedback analog signals from an output of a continuous-time linear equalizer (“CTLE”) and provides the difference to the comparators as said incoming analog signals.
-21. (canceled)
A linear feedback equalization method that comprises:
- comparing an incoming analog signal to multiple thresholds to obtain a multi-bit thermometer-coded digital signal;
- transforming the multi-bit thermometer-coded digital signal into one or more feedback analog signals each having a corresponding tap delay;
- filtering a receive signal with a continuous time linear equalizer (“CTLE”) to obtain a filtered analog signal;
- and
- combining the one or more feedback analog signals with the filtered analog signal to provide said incoming analog signal, said incoming analog signal having reduced intersymbol interference relative to the filtered analog signal.
An integrated circuit having a serializer/deserializer interface with a receiver that comprises a linear feedback equalizer, the linear feedback equalizer including:
- comparators that compare an incoming analog signal to multiple thresholds to obtain a multi-bit thermometer-coded digital signal;
- one or more digital analog converters (“DACs”) that transform the multi-bit thermometer-coded digital signal into one or more feedback analog signals each having a corresponding tap delay;
- a continuous time linear equalizer (“CTLE”) that filters a receive signal to obtain a filtered analog signal;
- and
- a combiner that subtracts the one or more feedback analog signals from the filtered analog signal to provide said incoming analog signal, said incoming analog signal having reduced intersymbol interference relative to the filtered analog signal.
Dependencies are inferred from the claim text.