Equalizer and method of equalizing signals
An equalizer includes an oversampling logic unit, a direct current setting unit, and an alternating current setting unit. The oversampling logic unit oversamples data from a channel to generate a plurality of direct current terms and a plurality of alternating current terms according to an oversampling clock, and outputting a plurality of direct current terms corresponding to an output clock and a plurality of alternating current terms corresponding to the output clock according to the output clock. The direct current setting unit adjusts a direct current setting of the equalizer according to a plurality of direct current terms inputted by the oversampling logic unit within a first predetermined time. And the alternating current setting unit adjusts an alternating current setting of the equalizer according to a plurality of alternating current terms inputted by the oversampling logic unit within the first predetermined time.
1. An equalizer, comprising:
an oversampling logic unit for executing an oversampling operation on data from a channel to generate a plurality of direct current terms and a plurality of alternating current terms according to an oversampling clock, and outputting a plurality of direct current terms corresponding to an output clock from the plurality of direct current terms and a plurality of alternating current terms corresponding to the output clock from the plurality of alternating current terms according to the output clock;
a direct current setting unit for adjusting a direct current setting of the equalizer according to a plurality of direct current terms outputted from the oversampling logic unit within a first predetermined time; and
an alternating current setting unit for adjusting an alternating current setting of the equalizer according to a plurality of alternating current terms outputted from the oversampling logic unit within the first predetermined time.
2. The equalizer of claim 1 , wherein the direct current setting unit comprises:
a direct current estimator coupled to the oversampling logic unit for averaging the plurality of direct current terms outputted from the oversampling logic unit within the first predetermined time to generate a direct current parameter; and
a direct current logic processor coupled to the direct current estimator for adjusting the direct current setting according to a plurality of direct current parameters.
3. The equalizer of claim 1 , wherein the alternating current setting unit comprising:
an alternating current estimator coupled to the oversampling logic unit for executing a discrete cosine transform and a discrete sine transform on the plurality of alternating current terms outputted from the oversampling logic unit within the first predetermined time to generate an alternating current parameter; and
an alternating current logic processor coupled to the alternating current estimator for adjusting the alternating current setting according to a plurality of alternating current parameters.
4. The equalizer of claim 1 , wherein a frequency of the oversampling clock is more than twice a frequency of the data from the channel.
5. A method of equalizing signals, the method comprising:
executing an oversampling operation on data from a channel to generate a plurality of direct current terms and a plurality of alternating current terms according to an oversampling clock;
outputting a plurality of direct current terms corresponding to an output clock from the plurality of direct current terms to a direct current setting unit and a plurality of alternating current terms corresponding to the output clock from the plurality of alternating current terms to an alternating current setting unit according to the output clock;
adjusting a direct current setting of the equalizer according to a plurality of direct current terms outputted within a first predetermined time; and
adjusting an alternating current setting of the equalizer according to a plurality of alternating current terms outputted within the first predetermined time.
6. The method of claim 5 , wherein adjusting the direct current setting of the equalizer according to the plurality of direct current terms outputted within the first predetermined time comprises:
averaging the plurality of direct current terms outputted within the first predetermined time to generate a direct current parameter; and
adjusting the direct current setting according to a plurality of direct current parameters.
7. The method of claim 5 , wherein adjusting the alternating current setting of the equalizer according to the plurality of alternating current terms outputted within the first predetermined time comprises:
executing a discrete cosine transform and a discrete sine transform on the plurality of alternating current terms outputted within the first predetermined time to generate an alternating current parameter; and
adjusting the alternating current setting according to a plurality of alternating current parameters.
8. The method of claim 5 , wherein a frequency of the oversampling clock is more than twice a frequency of the data from the channel.