Methods and systems for adaptive receiver equalization
First Claim
1. A method for adaptively equalizing a multi-gigabit analog information signal for a signal path, comprising the steps of:
- (1) sampling a multi-gigabit analog information signal, thereby generating analog samples;
(2) performing an equalizing process on the analog samples, wherein the equalizing includes minimizing differences between an average of post-transition sample amplitudes and an average of steady state sample amplitudes of the analog samples; and
(3) quantizing the equalized analog samples of the multi-gigabit analog information signal.
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Accused Products
Abstract
Methods and systems for minimizing distortions in an analog data signal include equalizing the analog data signal at a receive end. In an embodiment, the invention adapts equalization parameters to a signal path associated with the analog data signal. Adaptive control logic is implemented with analog and/or digital components. In an embodiment, the invention equalizes a discreet-time analog representation of an analog data signal. In an embodiment, the invention digitally controls equalization parameters. In an embodiment, a resultant equalized analog data signal is digitized. In an example implementation, an analog data signal is sampled, a quality of the samples is measured, and one or more equalization parameters are adjusted with digital controls as needed to minimize distortion of the samples. The equalized samples are then digitized. The present invention is suitable for lower rate analog data signals and multi-gigabit data rate analog signals.
94 Citations
17 Claims
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1. A method for adaptively equalizing a multi-gigabit analog information signal for a signal path, comprising the steps of:
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(1) sampling a multi-gigabit analog information signal, thereby generating analog samples; (2) performing an equalizing process on the analog samples, wherein the equalizing includes minimizing differences between an average of post-transition sample amplitudes and an average of steady state sample amplitudes of the analog samples; and (3) quantizing the equalized analog samples of the multi-gigabit analog information signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for adaptively equalizing time staggered portions of a multi-gigabit analog information signal for a signal path, comprising the steps of:
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(1) sampling the multi-gigabit analog information signal at a plurality of phases; (2) measuring an equalization quality of the samples from one of the plurality of phases; (3) equalizing the samples from each of the phases based on the measured equalization quality of the one phase, wherein the equalizing includes minimizing differences between an average of post-transition sample amplitudes and an average of steady state sample amplitudes of the analog samples; and (4) quantizing the equalized samples.
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12. A method for adaptively equalizing time staggered portions of a plurality of multi-gigabit analog information signals for respective signal paths, comprising the steps of:
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(1) generating clock signals from the plurality multi-gigabit analog information signals; (2) sampling each of the multi-gigabit analog information signals at a plurality of phases of the respective clock signals; (3) measuring an equalization quality of the samples from one of the plurality of phases for each of the multi-gigabit analog information signals; (4) equalizing the samples from each of the phases of each of the multi-gigabit analog information signals based on the measured equalization quality of the one phase of each of the respective multi-gigabit analog information signals, wherein the equalizing includes minimizing differences between an average of post-transition sample amplitudes and an average of steady state sample amplitudes of the analog samples; and (5) quantizing the equalized samples.
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13. A method for adaptively equalizing a plurality of multi-gigabit analog information signals for respective signal paths, comprising the steps of:
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(1) generating a clock signal for each of the multi-gigabit analog information signals from each of the respective multi-gigabit analog information signals; (2) sampling each of the multi-gigabit analog information signals according to the respective clock signals; (3) performing an equalizing process on the samples, wherein the equalizing includes minimizing differences between an average of post-transition sample amplitudes and an average of steady state sample amplitudes of the analog samples; and (4) quantizing the equalized samples.
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14. A system for quantizing a multi-gigabit serial analog information signal, comprising:
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a sampler configured to sample a multi-gigabit analog signal to generate analog samples; an equalizer coupled to said sampler and configured to minimize inter-symbol interferences in samples output from said sampler, said equalizer including a finite impulse response (“
FIR”
) having at least one adjustable tap;a quantizer coupled to said equalizer and configured to quantize equalized samples output from said equalizer; and control logic coupled to said FIR , said control logic including; a difference detector including a steady-state path, a post-transition path, and a combiner, wherein said combiner is configured to output an average difference between post-transition amplitudes of the equalized samples and steady-state amplitudes of the equalized samples; and a state machine coupled to one or more outputs of said difference detector and configured to generate said tap updates for said FIR according to said average difference. - View Dependent Claims (15, 16)
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17. A system for routing and adaptively equalizing high data rate analog data signals, comprising:
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a backplane having a plurality of signal paths; and at least one interface board coupled to said backplane, said interface board including a plurality of receivers coupled to said backplane signal paths, each said receiver including an adaptive equalizer; wherein each said adaptive equalizer is configured to adapt to an associated backplane signal path to equalize an analog data signal received from said associated backplane signal path; and wherein each said adaptive equalizer is configured to minimize differences between an average of post-transition sample amplitudes and an average of steady state sample amplitudes of the analog samples.
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Specification