Electrochemical Cell Measurement Circuit With Feedback Input Impedance
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Solution Overview
Problem
Existing electrochemical sensors face challenges in synthesizing high input impedance without resorting to complex process options or active circuitry, leading to increased cost and complexity, particularly in potentiometric and potentiostatic measurements.
Innovation Solution
The use of a converter with a feedback loop, incorporating a current conveyor or transimpedance amplifier, to synthesize large input impedance by buffering the sense current to zero, thereby eliminating the need for high impedance elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high input impedance is synthesized using active circuitry or complex process options, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a feedback mechanism where the converter output is fed back to the second converter input through a feedback path. This feedback loop enables the system to maintain high input impedance at the first converter input without requiring complex active circuitry, as the feedback automatically adjusts to counteract any current flow, thereby resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent introduces a converter as an intermediary element between the electrochemical cell and the measurement circuitry. This converter, with its specific configuration including the feedback path, acts as a mediator that transforms the measurement requirements, enabling high input impedance to be achieved through the intermediary's inherent properties rather than through complex surrounding circuitry
2Measurement precision
If high input impedance is synthesized using active circuitry or complex process options, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The feedback mechanism in the converter configuration enables high input impedance to be achieved through a relatively simple circuit topology. This feedback-based approach avoids the need for complex process options and specialized active circuitry that would increase manufacturing costs, while still delivering the required measurement precision for potentiometric and potentiostatic measurements
Solution Approach 2:
The patent employs a converter configuration that uses standard, readily available components rather than expensive specialized active circuitry. The feedback path with basic elements achieves the high input impedance function at low cost, making the measurement system more economical to manufacture while maintaining the necessary measurement precision
3Measurement precision
If complex process options or active circuitry are used to achieve high input impedance, then measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The feedback mechanism in the converter automatically maintains high input impedance through passive feedback action rather than requiring continuously active circuitry. The feedback path enables the system to achieve and maintain the high impedance state with minimal power consumption, as the feedback itself regulates the current flow without requiring additional active power-consuming components
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 approach reduces power consumption and circuit complexity while maintaining accurate impedance measurement, allowing for efficient potentiometric and potentiostatic measurements without the need for complex processes or active circuitry.
Implementation Method 1
a feedback path between the filter output and the second converter input
Data Source
AI summary
Circuitry for processing an analyte signal obtained from an electrochemical cell, the circuitry comprising: a converter, comprising: a first converter input configured to receive the analyte signal; a second converter input; and a converter output configured to output a converted analyte signal, the converter configured to generate the converted analyte signal in dependence on the analyte signal; a loop filter configured to filter a signal derived from the converted analyte signal to obtain a filtered analyte signal at a filter output; and a feedback path between the filter output and the second converter input.