High-speed continuous-time feedback equalizer for serial link receiver
AssigneeRealtek Semiconductor Corp.
InventorChia-Liang Lin
Life of this patent
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Abstract
An apparatus is disclosed, the apparatus comprising: a broad-band continuous-time adjustable weight summing cell for summing an input signal and a feedback signal into an intermediate signal in accordance with a weight factor for the feedback signal; a broad-band continuous-time delay cell for receiving the intermediate signal and outputting the feedback signal; a broad-band variable gain amplifier for amplifying the feedback signal into an output signal in accordance with a gain factor; and an adaptation circuit for adjusting the weight and the gain factor in accordance with the output signal and a timing defined by a clock signal so as to minimize an interference form a previous data to a present data embedded in the output signal.
Claims19
An apparatus comprising:
- a broad-band continuous-time adjustable weight summing cell for summing an input signal and a feedback signal into an intermediate signal in accordance with a weight factor for the feedback signal;
- a broad-band continuous-time delay cell for receiving the intermediate signal and outputting the feedback signal;
- a broad-band variable gain amplifier for amplifying the feedback signal into an output signal in accordance with a gain factor;
- and
- an adaptation circuit for adjusting the weight and the gain factor in accordance with the output signal and a timing defined by a clock signal so as to reduce an interference form a previous data to a present data embedded in the output signal.
A method comprising:
- summing an input signal and a feedback signal into an intermediate signal in accordance with a weight factor for the feedback signal using a broad-band continuous-time adjustable weight summing cell;
- delaying the intermediate signal into a feedback signal using a broad-band continuous-time delay cell;
- amplifying the feedback signal into an output signal in accordance with a gain factor a broad-band variable gain amplifier;
- and
- adjusting the weight and the gain factor with an adaptation circuit in accordance with the output signal and a timing defined by a clock signal so as to minimize an interference form a previous data to a present data embedded in the output signal.
An apparatus comprising:
- a continuous-time adjustable weight summing cell for summing an input signal and a feedback signal into an intermediate signal in accordance with a weight factor for the feedback signal;
- a continuous-time delay cell for receiving the intermediate signal and outputting the feedback signal;
- a variable gain amplifier for amplifying the feedback signal into an output signal in accordance with a gain factor;
- and
- an adaptation circuit comprising:
- a region detection circuit for determining a region of the output signal by comparing the output signal with the first level, the second level, and an average of the first level and the second level;
- wherein the adaptation circuit adjusts the weight and the gain factor in accordance with the region of the output signal and a timing defined by a clock signal so as to reduce an interference form a previous data to a present data embedded in the output signal.
Dependencies are inferred from the claim text.