Input Termination Circuit With Stable Impedance Across Attenuation
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Solution Overview
Problem
Conventional input termination circuits in communication systems fail to maintain stable output impedance and bandwidth, leading to bandwidth degradation and undesirable peaking at different attenuation settings, which affects signal quality and noise ratio in high-speed communication applications.
Innovation Solution
An input termination circuit is designed with two adjustable attenuation resistors that adjust in opposite directions to maintain stable output impedance and bandwidth, incorporating inductors and resistors to improve signal processing and attenuation, and a continuous time linear equalizer to enhance signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional input termination circuits are used, then the circuit structure is simple, but the output impedance and bandwidth become unstable at different attenuation settings
Solution Approach 1:
The patent changes the resistance values of the first and second attenuation resistors to different values to achieve stable output impedance. Specifically, the first attenuation resistor has a first resistance value and the second attenuation resistor has a second resistance value, where these values are specifically selected to maintain constant output impedance across different attenuation settings, resolving the instability issue of conventional circuits.
Solution Approach 2:
The patent introduces adjustable attenuation resistors that can dynamically change their resistance values based on attenuation requirements. This dynamic adjustment capability allows the circuit to maintain stable output impedance and bandwidth across varying operating conditions, unlike fixed conventional circuits.
2Ease of manufacture
If conventional input termination circuits are used, then the manufacturing process is simple, but the bandwidth degrades at different attenuation settings
Solution Approach 1:
The patent carefully selects specific resistance values for the attenuation resistors to maintain constant bandwidth across different attenuation settings. By changing the resistance parameters to optimized values, the circuit achieves stable bandwidth performance without complicating the manufacturing process, as standard resistor values can be used.
3Reliability
If attenuation is increased in conventional circuits, then signal attenuation improves, but peaking becomes variable and signal quality deteriorates
Solution Approach 1:
The patent changes the resistance values of the attenuation resistors to specific values that decouple attenuation control from peaking variation. This allows independent optimization of attenuation performance while maintaining constant peaking characteristics, resolving the trade-off between attenuation and peaking stability.
Data Source
AI summary
The present invention is directed to communication systems and electrical circuits. According to an embodiment, an input termination circuit includes a first attenuation resistor and a second attenuation resistor. The resistance values of these two resistors are adjusted in opposite directions to maintain a stable output impedance. There are other embodiments as well.