Floating Capacitive Comparator Supply for Low-Noise Decisions
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Solution Overview
Problem
Comparators in electronic circuits draw high current from a shared power supply, causing crosstalk and increased noise that negatively impact other components, necessitating a solution to isolate their power supply.
Innovation Solution
Implementing a comparator with a floating capacitive supply, where a capacitor acts as an individual power source, using electronic switches to alternate between charging and decision configurations, allowing the comparator to draw current from the capacitor without affecting other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a comparator draws high current from a shared power supply to increase decision speed, then the comparator's decision speed is improved, but crosstalk and noise increase that negatively impact other components
Solution Approach 1:
The patent divides the power supply into separate dedicated capacitors for each comparator, isolating the high current draw to individual components. Each comparator has its own floating capacitive supply that does not share current paths with other circuit components, thereby eliminating crosstalk and noise while maintaining high decision speed.
Solution Approach 2:
The patent introduces floating capacitors as intermediary energy storage elements between the power supply and comparators. These capacitors act as local energy reservoirs that decouple the high current demand of comparators from the main power supply, preventing direct current interference with other circuit components while still enabling fast decision-making.
2Object-affected harmful factors
If a dedicated capacitor is provided for each comparator to eliminate crosstalk, then crosstalk and noise are reduced, but device complexity increases
Solution Approach 1:
The patent employs a universal floating capacitive power supply architecture that can be applied to any comparator in the circuit using the same design pattern. The switching mechanism and capacitor configuration are standardized across multiple comparators, allowing the system to scale without proportionally increasing complexity. Each comparator uses identical circuit topography with its own dedicated capacitor and switching elements.
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
This configuration reduces crosstalk and noise by providing the comparator with its own power source, enhancing decision speed and reducing interference with other circuit components.
Implementation Method 1
a capacitor acts as an individual power source
Data Source
AI summary
Disclosed are circuits and methods for a comparator with a floating capacitive supply. A capacitor is coupled between a comparator and a power supply. Two sets of electronic switches are configured in opposing operational states to shift the configuration of the circuit between a charging configuration and a decision configuration. In the charging configuration, the capacitor draws current from the power supply. In the decision configuration, the comparator pulls current from the capacitor to perform a decision. The configuration of the two sets of switches is alternated to toggle between the charging configuration and the decision configuration, allowing for the capacitor to be recharged between each decision performed by the comparator.