Passive Equalizer with Tunable Resonant Circuit for High-Speed Data
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Solution Overview
Problem
Current passive equalizers in high-speed serial data communication systems are limited in their ability to enhance bandwidth and equalize gain effectively, particularly at high frequencies, due to their design which often results in distortion of electrical signals as they travel through channels.
Innovation Solution
A passive equalizer network utilizing a three-element resonant circuit with a serial LC and shunt C, combined with a resistive voltage-divider, and a positive feedback scheme when two equalizers are connected back-to-back, to achieve a gain magnitude greater than one and enhance bandwidth for both high-frequency and low-frequency equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a passive equalizer is used to reduce power consumption, then power efficiency is improved, but the ability to provide gain greater than one and enhance bandwidth is limited
Solution Approach 1:
The patent applies dynamics by making the equalizer tunable through variable capacitors and resistors that can be controlled digitally. This allows the passive equalizer to dynamically adjust its frequency response and provide different levels of equalization gain for different frequency components, enabling bandwidth enhancement while maintaining power efficiency. The tunable elements allow the system to adapt to different channel conditions without requiring active components.
Solution Approach 2:
The patent changes physical parameters by using variable capacitors and resistors whose values can be adjusted to modify the equalizer's transfer function. By changing the capacitance and resistance values, the equalizer can provide different gain magnitudes at different frequencies, achieving bandwidth enhancement capability while remaining passive. This parameter adjustment is controlled through digital interfaces, allowing flexible adaptation to various communication scenarios.
2Device complexity
If a passive equalizer with traditional design is used, then device simplicity is maintained, but signal distortion compensation at high frequencies is insufficient
Solution Approach 1:
The patent implements feedback by using the output of the passive equalizer and feeding it back through additional passive equalizer stages. This feedback mechanism allows the system to compensate for signal distortion more effectively, particularly at high frequencies. The feedback path includes tunable passive components that can be adjusted to optimize the compensation, improving signal quality while maintaining the passive nature of the equalizer.
Solution Approach 2:
The patent merges multiple passive equalizer stages together, combining their effects to achieve better signal distortion compensation. By cascading multiple stages with tunable elements, the system can provide more sophisticated frequency response shaping and gain enhancement. This merging of stages allows for improved high-frequency compensation while keeping each individual stage relatively simple and passive.
3Adaptability or versatility
If gain magnitude greater than one is achieved through passive equalization, then high-frequency equalization is improved, but bandwidth enhancement requires additional complexity
Solution Approach 1:
The patent uses dynamic tuning elements (variable capacitors and resistors) that can be controlled to provide different gain magnitudes across different frequency ranges. This dynamic adjustment capability allows the passive equalizer to achieve gain greater than one at high frequencies while maintaining control over the overall bandwidth response. The tunable elements enable the system to optimize performance for specific frequency ranges without requiring additional complex hardware stages.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively compensates for signal distortion by providing a peaking gain at high frequencies and adjustable equalization gain, improving signal quality and reducing jitter in high-speed serial data communication systems.
Implementation Method 1
a three-element resonant circuit with a serial LC and shunt C to form a unilateral voltage transfer-function equalization gain greater than one
Implementation Method 2
a resistive voltage-divider for a DC gain
Data Source
AI summary
A passive equalizer is provided. The passive equalizer includes a first resistive element, a first inductive element, a second resistive element, and a first variable capacitor. The first resistive element is coupled between an input node and an output node. The first inductive element and the second resistive element are coupled in series between the output node and a first voltage supply node. The first variable capacitor is coupled between the input node and a first node located between the first inductive element and the second resistive element.