Phased Clocking in Chemical Sensor Arrays to Reduce Switcher Noise
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Solution Overview
Problem
Noise within the circuitry of chemical sensor arrays, particularly in ion-sensitive field effect transistors (ISFETs), leads to propagating errors and inaccuracies in detecting minute chemical changes or low concentrations, which is exacerbated by integration with processing or memory devices.
Innovation Solution
A system that generates a set of clock signals with staggered edges to prevent simultaneous current pull from the power supply, reducing in-rush current and switcher noise, and adapts clock signal offsets to limit power draw variance, thereby reducing noise and making it easier to compensate during data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are integrated with processing or memory devices to improve functionality, then the system becomes more versatile, but noise within the system increases causing propagating errors
Solution Approach 1:
The patent segments the clock signals into multiple asynchronous phases, distributing power switching events across different time intervals. This temporal segmentation prevents simultaneous current draw from the power supply, reducing noise propagation throughout the integrated system while maintaining full functionality of sensors, processing, and memory devices.
2Productivity
If clock signals are synchronized to improve data processing efficiency, then productivity increases, but simultaneous current pull from power supply increases causing noise
Solution Approach 1:
The patent implements periodic action by distributing clock signal phases across different time periods. Each phase operates at the same frequency for efficient processing, but with temporal offsets that stagger power switching events. This periodic distribution maintains productivity while eliminating simultaneous current pull that generates switcher noise.
3Measurement precision
If power supply delivers high current to support large sensor arrays, then measurement precision improves, but in-rush current causes noise and power fluctuations
Solution Approach 1:
The patent applies preliminary action by pre-distributing power delivery across multiple phased clock signals. Instead of delivering high current simultaneously to all sensors, the system progressively activates sensor groups in different phases, preventing in-rush current while maintaining the total power available for high-precision measurements across the entire sensor array.
Data Source
AI summary
A system including a power supply and a clock circuitry to generate a plurality of clock signals. Each clock signal is synchronous with a primary clock signal. First, second, and third clock signals of the plurality of clock signals are asynchronous to each other. The system further includes a plurality of switches. Each switch of the plurality of switches is communicatively coupled to the power supply and the clock circuitry. A first switch of the plurality of switches receives the first clock signal, a second switch of the plurality of switches receives the second clock signal, and a third switch of the plurality of switches receives the third clock signal.