Receiver Equalizer Control Using Data and Boundary Sampling
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Solution Overview
Problem
Existing receiver circuits with equalizer circuits face challenges in updating equalizer gain efficiently and accurately, particularly when dealing with high-frequency signals, leading to potential false adjustments in reception intensity due to the need for long signal smoothing periods and reliance on single data reception patterns.
Innovation Solution
A receiver circuit design that includes an equalizer circuit, a first holding unit for sampled data, a second holding unit for boundary values, and an equalizer control circuit that updates intensity adjustments based on the polarity of consecutive data samples, allowing for timely and accurate reception intensity judgment and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal smoothing is performed for a long period to improve comparison accuracy in analog equalizer circuits, then measurement precision is improved, but device complexity and circuit size increase due to large capacity capacitors
Solution Approach 1:
The patent replaces the mechanical/analog signal smoothing system (using large capacitors) with a digital sampling and comparison system. The equalizer control circuit samples the reception signal at specific timing and compares discrete signal levels digitally, eliminating the need for large capacity capacitors while maintaining measurement precision.
Solution Approach 2:
The patent uses sampling to create copies of the reception signal at specific time points. By comparing these sampled copies rather than continuous analog signals, the system achieves accurate measurement without requiring long smoothing periods or large capacitors.
2Measurement precision
If signal smoothing is performed for a long period to improve comparison accuracy, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent performs sampling at predetermined timing points that are optimized to capture the essential signal characteristics. This preliminary sampling action allows the system to make accurate comparisons without waiting for long smoothing periods, significantly reducing the time required for equalizer intensity adjustment.
Solution Approach 2:
The patent replaces the time-consuming analog smoothing process with instantaneous digital sampling and comparison. The equalizer control circuit captures signal levels at specific moments and immediately compares them to determine intensity adjustments, eliminating the time delay inherent in analog smoothing.
3Productivity
If only one reception data is considered for intensity adjustment, then processing speed is improved, but reliability decreases due to false judgment of reception intensity
Solution Approach 1:
The patent applies different sampling and comparison strategies based on the specific signal pattern and timing. By sampling at multiple predetermined timing points and selecting appropriate samples for comparison, the system ensures reliable intensity judgment while maintaining efficient processing speed.
Solution Approach 2:
The patent samples the reception signal multiple times at different timing points, using more samples than the minimum single measurement. This excessive sampling ensures that at least one sample captures the true signal level accurately, preventing false judgments while maintaining processing efficiency through selective comparison.
Data Source
AI summary
A receiver circuit includes an equalizer circuit that adjusts reception intensity of an input signal based on an intensity adjustment value to generate a correction input signal; a first holding unit that holds a plurality of data items sampled based on a sampling clock for sampling values of the data items transmitted by the correction input signal in a receiving order; a second holding unit that holds a plurality of values of the correction input signal sampled based on a complementary sampling clock for sampling a boundary value of the data items in a receiving order; and an equalizer control circuit that judges the strength of reception intensity of the correction input signal based on a plurality of output signals of the first holding unit and a plurality of output signals of the second holding unit to update the intensity adjustment value based on the judgment result.