Transceiver with single coefficient based equalizer taps
First Claim
1. A transceiver comprising:
- an equalizer configured to receive an input signal and a plurality of coefficients, wherein the equalizer comprises a plurality of taps, wherein the plurality of taps are configured to, based on the plurality of coefficients, filter the input signal to generate an output signal, and wherein the plurality of taps comprise at least one precursor tap, a unity tap and postcursor taps; and
a control circuit configured to select the plurality of coefficients such that a sum of the plurality of coefficients is equal to a predetermined value, wherein the plurality of coefficients comprise (i) a first coefficient corresponding to the at least one precursor tap, (ii) a second coefficient corresponding to the unity tap, and (iii) postcursor coefficients corresponding to the postcursor taps, andwherein the control circuit is further configured to (i) maintain the second coefficient at a fixed value, (ii) based on the second coefficient, select the first coefficient and the postcursor coefficients, and (iii) while maintaining the second coefficient at the fixed value and while the equalizer is receiving the input signal, adjust the first coefficient or one of the postcursor coefficients.
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Abstract
A transceiver including an equalizer and a control circuit. The equalizer receives an input signal and first coefficients. The equalizer includes taps that, based on the first coefficients, filter the input signal to generate an output signal. The taps include a precursor tap, a unity tap and postcursor taps. The control circuit selects the first coefficients such that a sum of the first coefficients is equal to a predetermined value. The first coefficients include a precursor coefficient, a second coefficient, and post cursor coefficients corresponding respectively to the precursor tap, the unity tap, and the postcursor taps. The control circuit: maintains the second coefficient at a fixed value; based on the second coefficient, selects the precursor coefficient and the postcursor coefficients; and while maintaining the second coefficient at the fixed value and while the equalizer is receiving the input signal, adjusts the precursor coefficient or one of the postcursor coefficients.
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Citations
20 Claims
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1. A transceiver comprising:
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an equalizer configured to receive an input signal and a plurality of coefficients, wherein the equalizer comprises a plurality of taps, wherein the plurality of taps are configured to, based on the plurality of coefficients, filter the input signal to generate an output signal, and wherein the plurality of taps comprise at least one precursor tap, a unity tap and postcursor taps; and a control circuit configured to select the plurality of coefficients such that a sum of the plurality of coefficients is equal to a predetermined value, wherein the plurality of coefficients comprise (i) a first coefficient corresponding to the at least one precursor tap, (ii) a second coefficient corresponding to the unity tap, and (iii) postcursor coefficients corresponding to the postcursor taps, and wherein the control circuit is further configured to (i) maintain the second coefficient at a fixed value, (ii) based on the second coefficient, select the first coefficient and the postcursor coefficients, and (iii) while maintaining the second coefficient at the fixed value and while the equalizer is receiving the input signal, adjust the first coefficient or one of the postcursor coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of filtering an input signal via an equalizer, wherein the equalizer comprises a plurality of taps, and wherein the plurality of taps comprise at least one precursor tap, a unity tap and postcursor taps, the method comprising:
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receiving the input signal at the equalizer; receiving a plurality of coefficients at the plurality of taps; based on the plurality of coefficients, filtering the input signal to generate an output signal; selecting the plurality of coefficients such that a sum of the plurality of coefficients is equal to a predetermined value, wherein the plurality of coefficients comprise (i) a first coefficient corresponding to the at least one precursor tap, (ii) a second coefficient corresponding to the unity tap, and (iii) postcursor coefficients corresponding to the postcursor taps; maintaining the second coefficient at a fixed value; based on the second coefficient, selecting the first coefficient and the postcursor coefficients; and while maintaining the second coefficient at the fixed value and while the equalizer is receiving the input signal, adjusting the first coefficient or one of the postcursor coefficients. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification