Integrated Chemical Sensor Chip With On-Chip Memory Engine
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Solution Overview
Problem
Portable electronic devices' multitasking CPUs face difficulties in controlling chemical sensors due to their inability to maintain control over processes lasting more than one second, which is necessary for chemical sensor operations like gas detection, as they are typically not suited for long-duration processes.
Innovation Solution
An integrated chemical sensor chip with a chemically sensitive layer, a heater, on-chip memory for storing measurement routines, and an engine for controlling the heater and measuring resistance, allowing for asynchronous operation and real-time control of heating and measurement processes without the need for an external microprocessor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multitasking CPU is used to control chemical sensor operations, then the device can perform core functions such as data and voice communication, but the CPU cannot maintain control of the chemical sensor's operations for durations exceeding one second
Solution Approach 1:
The control system is segmented into two parts: a multitasking CPU for high-level device control and a dedicated engine on the sensor chip for continuous sensor operation. The engine handles the long-duration control tasks independently while the CPU manages communication and data processing, resolving the conflict between multitasking and continuous control.
Solution Approach 2:
An intermediary interface is introduced between the CPU and the sensor chip's engine. This interface allows the CPU to initiate and configure sensor operations without needing to maintain continuous control, enabling the engine to autonomously manage the measurement process for the required duration.
2Reliability
If the sensitive layer is heated to elevated temperatures for chemical sensing, then analyte detection is enabled, but power consumption increases
Solution Approach 1:
The heating is performed periodically rather than continuously. The engine controls the heater to reach elevated temperatures only when measurements are required, then reduces or stops heating between measurements. This periodic heating maintains detection capability while significantly reducing average power consumption.
Solution Approach 2:
The heating temperature and duration are dynamically adjusted based on measurement requirements. The engine optimizes the thermal parameters to achieve sufficient analyte detection with minimal energy expenditure, changing temperature and time parameters adaptively rather than maintaining constant high-temperature operation.
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
Enables efficient and flexible chemical sensor operations in portable devices by tolerating various time constants and reducing power consumption, making it suitable for mobile applications without impacting thermal or chemical processes, and allowing for different measurement routines to be stored for various use cases.
Implementation Method 1
a heater for heating the sensitive layer
Implementation Method 2
As a result of a catalytic reaction, a conductivity of the sensitive layer may change which change can be measured
Data Source
AI summary
An integrated chemical sensor chip comprises on or integrated in a common substrate a chemically sensitive layer and a heater heating the sensitive layer. In addition, a memory is provided for the storage of a measurement routine, the measurement routine comprising instructions defining a heating process over time and instructions defining one or more measurement points in time. An I/O interface is provided for receiving a trigger for the measurement routine and for supplying a result of the measurement routine. An engine controls the heater and measures a resistance of the sensitive layer according the instructions of the measurement routine.