Adaptation of gain of baseline wander signal
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsShiva Prasad Kotagiri, Amaresh V. Malipatil
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Abstract
A receiver disposed in a serializer/deserializer (SerDes) system includes a coupling capacitor configured to receive a serial input signal from a transmitter operatively coupled with the receiver via a communication channel established therebetween and to output a capacitance output signal, an equalizer configured to receive a signal including the capacitance output signal having a baseline wander gain subtracted therefrom, a running disparity generator receiving decoded symbols and generating a running disparity signal, and a low-pass filter receiving the running disparity signal and outputting the BLW gain.
Claims20
A receiver disposed in a serializer/deserializer (Ser Des) system, the receiver comprising:
- a coupling capacitor configured to receive a serial input signal from a transmitter operatively coupled with the receiver via a communication channel established therebetween and to output a capacitance output signal;
- an equalizer configured to receive a signal comprising the capacitance output signal having a baseline wander gain subtracted therefrom, and to output an equalized signal;
- a running disparity generator receiving decoded symbols and generating a running disparity signal;
- and
- a low-pass filter receiving the running disparity signal and outputting the baseline wander gain, wherein the coupling capacitor is part of an on-chip alternating current coupling capacitance that causes a high-pass filter to be applied to the received serial input signal and wherein a cut-off frequency of the low-pass filter is equal to that of the high-pass filter at least due to the on-chip alternating current coupling capacitance.
A method for adaptation of baseline wander gain executed by a receiver disposed in a serializer/deserializer (SerDes) system, the method comprising:
- receiving, by a coupled capacitor, a serial input signal from a transmitter operatively coupled with the receiver via a communication channel established therebetween;
- outputting, by the coupled capacitor, a capacitance output signal;
- subtracting a baseline wander gain from the capacitance output signal output by the coupled capacitor prior to inputting the capacitance output signal to an equalizer;
- generating a running disparity signal with a running disparity generator that is receiving decoded symbols;
- and
- applying a low-pass filter to the running disparity signal to obtain the baseline wander gain, wherein the coupled capacitor is part of an on-chip alternating current coupling capacitance that causes a high-pass filter to be applied to the received serial input signal and wherein a cut-off frequency of the low-pass filter is equal to that of the high-pass filter at least due to the on-chip alternating current coupling capacitance.
A computer program product embodied in a non-transitory machine-readable medium having machine-readable program code embodied thereon for performing a method of adaptation of baseline wander gain, the method comprising:
- receiving a serial input signal;
- outputting a capacitance output signal using the serial input signal;
- subtracting a baseline wander gain from the capacitance output signal prior to inputting the capacitance output signal to an equalizer;
- generating a running disparity signal using decoded symbols;
- and
- applying a low-pass filter to the running disparity signal to obtain the baseline wander gain, wherein the coupled capacitor is part of an on-chip alternating current coupling capacitance that causes a high-pass filter to be applied to the received serial input signal and wherein a cut-off frequency of the low-pass filter is equal to that of the high-pass filter at least due to the on-chip alternating current coupling capacitance.
Dependencies are inferred from the claim text.