Signal processing device capable of enhancing correctness of feedback signals
AssigneeRealtek Semiconductor Corp.
InventorsHou-Wei Lin, Shieh-Hsing Kuo, Yi-Lin Li, Kuang-Yu Yen
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Abstract
A signal processing device for processing a passband signal to generate an equalized signal includes a passband adaptive equalizer for generating the equalized signal according to the passband signal, including at least one feed-forward equalizer (FFE) and one feedback equalizer (FBE), and a multilevel quantizer coupled with the passband adaptive equalizer for selectively utilizing a single predetermined threshold or a plurality of multiple predetermined thresholds to quantize the equalized signal in order to generate a sliced signal.
Claims14
A signal processing device for processing a received signal to generate a sliced signal, comprising:
- an equalizer for generating an equalized signal according to the received signal;
- a multilevel quantizer, coupled to the equalizer, for utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted, and utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels;
- and
- a control logic for adopting one of the first mode and the second mode by executing the following steps:
- adopting the first mode and then comparing the equalized signal with the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the equalized signal with a predetermined value which is different from any of the sliced signal and the X threshold/thresholds for obtaining a second difference;
- adopting the second mode instead of the first mode when the first difference and the second difference together indicate an unreliable status;
- and
- adopting the first mode when the first difference and the second difference together indicate a reliable status.
A signal processing device for generating a sliced signal according to a received signal, comprising:
- an equalizer for generating an equalized signal according to the received signal;
- a quantizer, coupled to the equalizer, for utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted, and utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels;
- and
- a control logic for adopting one of the first mode and the second mode by executing the following steps:
- adopting the first mode and then comparing the equalized signal with the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the first difference with a predetermined threshold which is different from any of the sliced signal and the X threshold/thresholds;
- adopting the second mode instead of the first mode when the first difference is larger than the predetermined threshold;
- and
- adopting the first mode when the first difference is smaller than the predetermined threshold.
A signal processing method for generating a sliced signal according to a received signal, comprising:
- generating an equalized signal according to the received signal;
- utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted;
- utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels;
- adopting the first mode and then subtracting the equalized signal from the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the first difference with a predetermined threshold which is different from any of the sliced signal and the X threshold/thresholds;
- adopting the second mode instead of the first mode when the first difference is larger than the predetermined threshold;
- and
- adopting the first mode when the first difference is smaller than the predetermined threshold.
Dependencies are inferred from the claim text.