Input Termination Circuit for Stable Bandwidth and Impedance
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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 varying 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 for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional input termination circuits are used with fixed attenuation resistors, then the circuit structure is simple, but the output impedance and bandwidth become unstable at different attenuation settings
Solution Approach 1:
The patent applies dynamics by making the attenuation resistors adjustable rather than fixed. The first attenuation resistor is controlled by a first control signal and the second attenuation resistor by a second control signal, allowing the circuit to dynamically adapt its resistance values to maintain stable output impedance and bandwidth across different attenuation settings.
Solution Approach 2:
The patent changes the resistance parameters of the attenuation resistors based on control signals. By adjusting the resistance values of the first and second attenuation resistors in response to control signals, the circuit maintains stable output impedance and bandwidth while achieving different attenuation levels, thus resolving the contradiction between stability and complexity.
2Reliability
If attenuation is increased to improve signal quality, then noise ratio improves, but bandwidth degrades
Solution Approach 1:
The patent changes multiple parameters simultaneously - adjusting both attenuation resistors and their respective control signals in a coordinated manner. This allows the circuit to achieve high attenuation for improved signal quality while maintaining bandwidth through compensatory parameter adjustments, resolving the trade-off between reliability and speed.
Solution Approach 2:
The patent implements feedback control where control signals adjust the attenuation resistors based on desired performance characteristics. This feedback mechanism allows the system to maintain optimal signal quality and bandwidth by dynamically responding to performance requirements, rather than suffering from fixed parameter limitations.
3Stability of the object's composition
If multiple adjustable components are added to maintain stable bandwidth, then bandwidth stability improves, but device complexity increases
Solution Approach 1:
The patent makes existing attenuation resistors multi-functional by enabling them to serve both attenuation and bandwidth stabilization functions. Through coordinated adjustment of the first and second attenuation resistors with their respective control signals, the same components achieve multiple objectives without requiring additional dedicated elements, thus improving bandwidth stability while limiting complexity growth.
4Reliability
If attenuation resistors are adjusted to modify attenuation amount, then signal attenuation improves, but output impedance varies
Solution Approach 1:
The patent simultaneously changes multiple parameters - both the resistance values of the attenuation resistors and their control signals - in a coordinated fashion. This multi-parameter adjustment allows the circuit to achieve the desired attenuation control while maintaining stable output impedance, as the parameter changes compensate for each other's effects on impedance.
Solution Approach 2:
The patent uses feedback control signals to adjust the attenuation resistors in a way that maintains stable output impedance. The control signals provide feedback mechanisms that ensure impedance stability is preserved while achieving the required attenuation levels, resolving the contradiction between attenuation control and impedance 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.