US 2026/0303416 A1Published application

Equalizer circuit and calibration method therefor

AssigneeNovatek Microelectronics Corp.

InventorsChih Cheng Lin, Ka Wai Tang, Yu An Yang

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Abstract

An equalizer circuit including a first summing circuit, a second summing circuit, a first sampler circuit, a second sampler circuit, and a multiplexer is provided. The first sampler circuit generates a first sampled signal which is weighted to generate a second feedback signal. The second sampler circuit generates a second sampled signal which is weighted to generate a first feedback signal. The multiplexer generates a polarity indication signal based on one of the first sampled signal and the second sampled signal. The equalizer circuit performs a first calibration operation to compensate for a first offset voltage of the equalizer circuit based on a preset threshold voltage, and performs a second calibration operation to compensate for a second offset voltage of the equalizer circuit based on the weight value used for generating the first feedback signal, the weight value used for generating the second feedback signal, and the polarity indication signal.

Claims16

Dependent claims

An equalizer circuit, comprising:

a first summing circuit, configured to generate a first summing signal based on an input signal, a first feedback signal, and a polarity indication signal, wherein the polarity indication signal indicates a polarity of a weight value used for generating the first feedback signal;
a second summing circuit, configured to generate a second summing signal based on the input signal, a second feedback signal, and the polarity indication signal, wherein the polarity indication signal indicates a polarity of a weight value used for generating the second feedback signal;
a first sampler circuit, coupled between an output terminal of the first summing circuit and an input terminal of the second summing circuit, wherein the first sampler circuit is configured to generate a first sampled signal based on the first summing signal, and the first sampled signal is weighted to generate the second feedback signal;
a second sampler circuit, coupled between an output terminal of the second summing circuit and an input terminal of the first summing circuit, wherein the second sampler circuit is configured to generate a second sampled signal based on the second summing signal, and the second sampled signal is weighted to generate the first feedback signal;
and
a multiplexer, coupled to an output terminal of the first sampler circuit and an output terminal of the second sampler circuit, wherein the multiplexer is configured to generate the polarity indication signal based on one of the first sampled signal and the second sampled signal,
wherein the equalizer circuit is configured to perform a first calibration operation to compensate for a first offset voltage of the equalizer circuit based on a preset threshold voltage,
wherein the equalizer circuit is further configured to perform a second calibration operation to compensate for a second offset voltage of the equalizer circuit based on the weight value used for generating the first feedback signal, the weight value used for generating the second feedback signal, and the polarity indication signal.

5 more elements

A calibration method for an equalizer circuit, wherein the equalizer circuit comprises:

a first sampler circuit, configured to generate a first sampled signal, and the first sampled signal is weighted to generate the second feedback signal;
a second sampler circuit, configured to generate a second sampled signal, and the second sampled signal is weighted to generate the first feedback signal
a multiplexer, coupled to an output terminal of the first sampler circuit and an output terminal of the second sampler circuit, wherein the multiplexer is configured to generate a polarity indication signal based on one of the first sampled signal and the second sampled signal, wherein the polarity indication signal indicates a polarity of a weight value used for generating the first feedback signal and a polarity of a weight value used for generating the second feedback signal,
wherein the calibration method for the equalizer circuit comprises:
performing a first calibration operation to compensate for a first offset voltage of the equalizer circuit based on a preset threshold voltage;
and
performing a second calibration operation to compensate for a second offset voltage of the equalizer circuit based on the weight value used for generating the first feedback signal, the weight value used for generating the second feedback signal, and the polarity indication signal.

4 more elements

Dependencies are inferred from the claim text.