Dynamic Reference Bias Voltage Circuit for Low-Power Sensor Accuracy

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Solution Overview

Problem

Existing potentiostatic measurement systems are costly and consume excessive power, making them unsuitable for low-cost, low-power devices that require high accuracy, such as medical devices and environmental sensors.

Innovation Solution

A new circuit design that generates a reference bias voltage internally using a resistor/capacitor network and an analog-to-digital converter, eliminating the need for expensive external components, and employs noise shaping and filtering to maintain accuracy while reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If high accuracy reference components and ASIC/DSP circuits are used to achieve high measurement accuracy, then measurement precision is improved, but device cost and power consumption increase

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The system uses the ADC's own quantization noise as the reference signal source, eliminating the need for external high-precision reference components. The ADC converts its internal noise to a digital reference signal, making the system self-sufficient and removing power-hungry external reference components while maintaining measurement accuracy.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention replaces expensive, power-consuming high-precision reference components with inexpensive, low-power alternatives. By using the ADC's internal noise source and software-based processing, the system achieves high accuracy without requiring costly hardware components, effectively using 'cheap' digital processing instead of 'expensive' analog references.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Measurement precision

If high accuracy reference components and specialized circuits are used, then measurement precision is improved, but device cost increases

Engineering Contradiction:

Improvemeasurement accuracyVSAvoiddevice cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The system creates a digital copy of the reference signal from the ADC's internal noise rather than using a physical analog reference component. This digital copying approach eliminates the need for expensive analog reference hardware while maintaining the functional equivalence needed for accurate measurements.

Inventive Principle:

Principle #26Copying

3Device complexity

If fixed reference voltage is used, then circuit simplicity is maintained, but adaptability to different measurement conditions decreases

Engineering Contradiction:

Improvecircuit simplicityVSAvoidvoltage flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The system dynamically adjusts the reference voltage by controlling the duty cycle of the square wave signal fed to the RC network. This allows the reference voltage to adapt to different measurement conditions and sensor requirements while maintaining circuit simplicity through software control rather than complex hardware switching.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the voltage parameter dynamically by adjusting the duty cycle of the input square wave to the RC integrator. This parameter adjustment mechanism provides voltage flexibility without requiring multiple fixed voltage sources or complex switching circuitry, maintaining simplicity while achieving adaptability.

Inventive Principle:

Principle #35Parameter changes

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

The new circuit achieves high accuracy and low power consumption by generating a flexible reference bias voltage, allowing for agile voltage adjustments and quick settling times, while enabling the system to enter low-power modes, thus optimizing energy usage.

Implementation Method 1

a first resistor/capacitor network of the additional analog to digital converter is charged to a first voltage level representing the reference bias voltage

Methodology Applied

Scientific EffectRC time constant charging: Capacitance

Implementation Method 2

an operational amplifier of the additional analog to digital converter is configured to differentiate a reference bias voltage signal from the noise driver to produce an output signal

Methodology Applied

Scientific EffectElectrical differentiation:

Data Source

PatentEP4110169B1System and apparatus for generating dynamic reference voltage in power constrained devices

Publication Date: 2026.04.01 GANTON ROBERT BRUCE

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AI summary

A simplified electronics approach to allow cost, size, and power consumption to be reduced while maintaining state of the art accuracy and reliability, key features for wireless medical devices/sy stems and industrial sensors alike. Extreme accuracy is achieved by innovative noise shaping and filtering introduced to the electrochemical sensor, before sampling by the analog to digital converter. Introduction of the noise and bias to the electrochemical sensor provides very low power biasing which is necessary to achieve overall reliable and very accurate bias for the electrochemical reaction cell.