Strain Compensation Circuit for Voltage Reference Precision
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Solution Overview
Problem
Existing voltage reference circuits face challenges in maintaining precision over time and across varying conditions such as stress, temperature, or both, due to strain-induced voltage drift.
Innovation Solution
A circuit comprising a voltage reference circuit and a strain compensation circuit, where the strain compensation circuit includes a strain-dependent circuit element like a piezoelectric resistor, and a variable current source circuit to generate a strain compensation current, effectively canceling out strain-induced voltage drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage reference circuit is used to generate a precise reference voltage, then the output voltage precision is improved, but the voltage drifts under strain conditions
Solution Approach 1:
The patent applies the piezoresistive effect to convert strain-induced resistance changes into a beneficial compensation mechanism. The strain compensation circuit uses piezoresistive elements that generate compensating voltages proportional to the applied strain, thereby converting the harmful strain effect into a useful correction signal that cancels out the reference voltage drift
Solution Approach 2:
The patent implements a feedback mechanism where the strain compensation circuit continuously monitors the strain conditions and dynamically adjusts the compensating voltage to counteract the reference voltage drift. The compensation voltage is fed back to the output to maintain the reference voltage stability under varying strain conditions
2Stability of the object's composition
If strain compensation circuitry is added to compensate for voltage drift, then voltage stability under strain is improved, but circuit complexity increases
Solution Approach 1:
The patent merges the strain compensation functionality with the existing voltage reference circuit by integrating piezoresistive elements directly into the reference voltage generation path. This consolidation approach reduces overall system complexity by combining multiple functions into a unified circuit architecture rather than adding separate compensation modules
Solution Approach 2:
The patent utilizes parameter changes in the piezoresistive elements' resistance under strain to achieve compensation. By designing the compensation circuit to exploit the natural parameter变化 of piezoresistive materials under mechanical stress, the solution achieves strain compensation through passive parameter modulation rather than active complex control mechanisms
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 solution achieves a compensated reference voltage that is substantially independent of strain, reducing voltage drift and enhancing the precision and stability of the voltage reference circuit.
Implementation Method 1
the strain compensation circuit comprises a strain dependent circuit element that exhibits an impedance that is a function of strain. Further, in one aspect of the disclosure the strain dependent circuit element comprises a piezoelectric resistor
Data Source
AI summary
A circuit (70) includes a voltage reference circuit (72) that includes an output terminal (74), wherein the voltage reference circuit (72) is configured to generate an output voltage at the output terminal (74) having a first transfer function of voltage with respect to strain. The circuit (70) also includes a strain compensation circuit (78) having an input terminal connected to the output terminal (74) of the voltage reference circuit, and having a strain compensation circuit output terminal (80). The strain compensation circuit (78) is configured to receive the output voltage comprising the first transfer function at the input terminal. The strain compensation circuit (78) has a second transfer function of voltage with respect to strain that is substantially opposite that of the first transfer function, thereby outputting a compensated voltage at the strain compensation circuit output terminal (80) that is substantially independent of strain.