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US 11,153,133 B2Granted
Methods and circuits for adaptive equalization
AssigneeRambus Inc.
InventorRamin Farjad-Rad
Life of this patent
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Abstract
An integrated circuit equalizes a data signal expressed as a series of symbols. The symbols form data patterns with different frequency components. By considering these patterns, the integrated circuit can experiment with equalization settings specific to a subset of the frequency components, thereby finding an equalization control setting that optimizes equalization. Optimization can be accomplished by setting the equalizer to maximize symbol amplitude.
Claims20
An integrated circuit comprising:
- an adjustable equalizer to treat an input signal to a range of frequency-dependent amplification factors to thereby produce an equalized signal;
- a sampler coupled to the adjustable equalizer to sample the equalized signal in time to a first clock signal of a first frequency to thereby produce a first sequence of samples;
- and
- an amplitude detector coupled to the adjustable equalizer to sample the equalized signal with reference to a threshold and in time to a second clock signal of a second frequency lower than the first frequency to thereby produce a second sequence of samples, the amplitude detector including control logic to adjust the threshold responsive to the second sequence of samples.
1 more element
A method comprising:
- treating an input signal to a range of frequency-dependent amplification factors to thereby produce an equalized signal;
- sampling the equalized signal in time to a first clock signal of a first frequency to thereby produce a first sequence of samples;
- sampling the equalized signal with reference to a threshold and in time to a second clock signal of a second frequency lower than the first frequency to thereby produce a second sequence of samples;
- and
- adjusting the threshold responsive to the second sequence of samples.
2 more elements
An integrated circuit comprising:
- an adjustable equalizer to treat an input signal to a range of frequency-dependent amplification factors to thereby produce an equalized signal;
- a sampler coupled to the adjustable equalizer to sample the equalized signal in time to a first clock signal of a first frequency to thereby produce a first sequence of samples;
- and
- means for sampling the equalized signal with reference to a threshold and in time to a second clock signal of a second frequency lower than the first frequency to thereby produce a second sequence of samples, and for adjusting the threshold responsive to the second sequence of samples.
1 more element
Dependencies are inferred from the claim text.