ADAPTIVE EQUALIZER CIRCUIT
First Claim
1. An adaptive equalizer circuit, comprising:
- an equalizer circuit configured to produce an output data signal by correcting an input data signal waveform for each unit time in response to an equalizing factor;
a data detecting circuit configured to detect a signal level of the output data signal in a given unit time at predetermined timing indicated by a clock signal synchronized with the output data;
a boundary detecting circuit configured to detect a signal level of the output data signal at a timing that is ½
unit time away from the predetermined timing indicated by the clock signal; and
a control unit configured to detect, multiple times, a predetermined data pattern having consecutive data items of a first logic value followed by a data item of a second logic value, and to adjust the equalizing factor such that a value of a detection result obtained by the data detecting circuit and a value of a detection result obtained by the boundary detecting circuit for the data item of the second logic value are equal to each other a certain percentage of times, and are different from each other substantially the same percentage of times.
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Accused Products
Abstract
An adaptive equalizer circuit includes an equalizer circuit configured to produce an output data signal in response to an equalizing factor, a data detecting circuit configured to detect a signal level of the output data signal in a given unit time at predetermined timing, a boundary detecting circuit configured to detect a signal level of the output data signal at a timing that is ½ unit time away from the predetermined timing, and a control unit configured to detect, multiple times, a pattern having consecutive data items of a first value followed by a data item of a second value, and to adjust the equalizing factor such that a data detection value and a boundary detection value obtained for the data item of the second value are equal to each other a certain percentage of times, and are different from each other substantially the same percentage of times.
9 Citations
10 Claims
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1. An adaptive equalizer circuit, comprising:
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an equalizer circuit configured to produce an output data signal by correcting an input data signal waveform for each unit time in response to an equalizing factor; a data detecting circuit configured to detect a signal level of the output data signal in a given unit time at predetermined timing indicated by a clock signal synchronized with the output data; a boundary detecting circuit configured to detect a signal level of the output data signal at a timing that is ½
unit time away from the predetermined timing indicated by the clock signal; anda control unit configured to detect, multiple times, a predetermined data pattern having consecutive data items of a first logic value followed by a data item of a second logic value, and to adjust the equalizing factor such that a value of a detection result obtained by the data detecting circuit and a value of a detection result obtained by the boundary detecting circuit for the data item of the second logic value are equal to each other a certain percentage of times, and are different from each other substantially the same percentage of times. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification