Receiver Equalizer Circuit for Balanced Signal Decay Compensation
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Solution Overview
Problem
In HDMI and USB communication systems, high frequency components of input signals decay more severely than low frequency components during analog to digital conversion, leading to blurred eye diagrams and indistinguishable voltage levels, which complicates signal decoding.
Innovation Solution
An equalizer circuit comprising transistors and a resistor-capacitor network is used to compensate input signals, optimizing resistance to ensure similar decay rates for both high and low frequency components, maintaining signal integrity and distinguishability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional equalizers are used to compensate high frequency components, then high frequency signal quality improves, but low frequency components decay excessively
Solution Approach 1:
The patent changes the resistance value of the resistor in the equalizer circuit to optimize the compensation effect. By adjusting the resistance parameter, the equalizer can compensate for high frequency signal degradation while minimizing excessive decay of low frequency components, achieving a balanced frequency response.
Solution Approach 2:
The resistor acts as an intermediary element in the equalizer circuit, mediating between the high frequency and low frequency components. Through its specific resistance value, it enables selective compensation of high frequency signals while controlling the impact on low frequency components.
2Measurement precision
If resistor resistance is increased to compensate high frequency decay, then high frequency component restoration improves, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent optimizes the resistance parameter to achieve the best compromise between high frequency restoration and signal-to-noise ratio maintenance. Through careful selection of the resistance value, the equalizer restores high frequency components effectively while keeping the signal-to-noise ratio within acceptable ranges.
Data Source
AI summary
An equalizer for compensating an input signal in a receiver of a communication system is disclosed. The equalizer includes a first transistor, having a gate for receiving a positive input voltage of the input signal; a second transistor, having a gate for receiving a negative input voltage of the input signal, and a source coupled to a source of the first transistor; and a resistor, connected with at least one capacitor to be coupled between a drain of the first transistor and a drain of the second transistor, for optimizing a resistance of the resistor, to compensate the input signal.